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199 relations: AC adapter, Access time, Actuator, Advanced Format, Amiga, Apple ProFile, Arbitrated loop, Areal density (computer storage), ATA over Ethernet, Atari ST, Automatic acoustic management, Auxiliary memory, Bad sector, Binary prefix, Bit, Bit rate, Block (data storage), Bus (computing), Byte, Car, Carnegie Mellon University, Central processing unit, Checksum, CHKDSK, Cleanroom, Click of death, Comparison of disk encryption software, Computer data storage, Console application, Corrosion, Corvus Systems, Count key data, Crosstalk, Cylinder-head-sector, Data corruption, Data erasure, Data Integrity Field, Data recovery, Data storage, Data-rate units, David S. H. Rosenthal, Defragmentation, Density of air, Desktop computer, Differential signaling, Digital data, Digital signal processor, Digital video recorder, Direct memory access, Direct-access storage device, ..., Disk array controller, Disk buffer, Disk controller, Disk enclosure, Disk pack, Disk partitioning, Disk read-and-write head, Disk sector, Disk storage, DOS, Drag (physics), Drive mapping, Electrothermal instability, Elsevier, Enterprise software, Error detection and correction, Error recovery control, Exabyte, Exchange spring media, Federal Reserve Board of Governors, Ferromagnetism, Fibre Channel, File Allocation Table, File carving, File server, File system, File system fragmentation, Flash memory, Floppy disk, Flying height, Form factor (design), Forward error correction, Frequency modulation, Fsck, Fujitsu Eagle, G-force, Giant magnetoresistance, Gibibyte, Gigabyte, Google, Graphical user interface, Group coded recording, GUID Partition Table, Hard disk drive failure, Hard disk drive performance characteristics, Hard disk drive platter, Head crash, Heat-assisted magnetic recording, HGST, History of general-purpose CPUs, History of IBM magnetic disk drives, Host adapter, Hybrid drive, IBM, IBM Personal Computer XT, IEEE 1394, Inch, Inode, Institute of Electrical and Electronics Engineers, Interface (computing), International System of Units, ISCSI, Latency (engineering), LocalTalk, Logical block addressing, Loudspeaker, Low-density parity-check code, LWN.net, Mac OS X Snow Leopard, Macintosh, Macintosh 128K, Macintosh 512K, Macintosh Plus, MacOS, Magnet, Magnet wire, Magnetic cartridge, Magnetic field, Magnetic storage, Magnetic tape, Mainframe computer, Mass storage, Master boot record, Mean time between failures, Megabyte, Metadata, Microdrive, Microsoft Windows, Modified Frequency Modulation, Moore's law, Nanometre, Neodymium magnet, Noisy-channel coding theorem, Non-volatile memory, Object storage, Operating system, Oracle Corporation, Parallel ATA, Partial-response maximum-likelihood, Patterned media, PC Magazine, Perpendicular recording, Personal computer, Plug and play, Price elasticity of demand, Price index, Printed circuit board, RAID, Random access, Reed–Solomon error correction, Revolutions per minute, Reynold B. Johnson, RK05, Rotational speed, RS-422, RS-485, Run-length limited, Ruthenium, S.M.A.R.T., SCSI, Seagate Technology, Sequential access, Serial ATA, Serial Attached SCSI, Server (computing), Servomotor, Shared resource, Shingled magnetic recording, Solid-state drive, Square inch, Stepper motor, Storage area network, Superparamagnetism, Tallgrass Technologies, Terabyte, Throughput, Tom's Hardware, Toshiba, Unit prefix, Unix, Unix-like, USB, Voice coil, Western Digital, Western Digital Raptor, Write precompensation, Zone bit recording, 19-inch rack, 2011 Thailand floods. Expand index (149 more) »
AC adapter
An AC adapter, AC/DC adapter, or AC/DC converter is a type of external power supply, often enclosed in a case similar to an AC plug.
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Access time
Access time is the time delay or latency between a request to an electronic system, and the access being completed or the requested data returned.
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Actuator
An actuator is a component of a machine that is responsible for moving and controlling a mechanism or system, for example by opening a valve.
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Advanced Format
Advanced Format is a generic term pertaining to any disk sector format used to store data on magnetic disks in hard disk drives (HDDs) that exceeds 512, 520, or 528 bytes per sector, such as the 4096, 4112, 4160, and 4224-byte (4 KiB) sectors of the Advanced Format hard disk drives.
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Amiga
The Amiga is a family of personal computers introduced by Commodore in 1985.
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Apple ProFile
The ProFile was the first hard disk drive produced by Apple Computer, initially for use with the Apple III personal computer.
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Arbitrated loop
Arbitrated Loop, also known as FC-AL, is a Fibre Channel topology in which devices are connected in a one-way loop fashion in a ring topology.
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Areal density (computer storage)
Areal density is a measure of the quantity of information bits that can be stored on a given length of track, area of surface, or in a given volume of a computer storage medium.
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ATA over Ethernet
ATA over Ethernet (AoE) is a network protocol developed by the Brantley Coile Company, designed for simple, high-performance access of block storage devices over Ethernet networks.
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Atari ST
The Atari ST is a line of home computers from Atari Corporation and the successor to the Atari 8-bit family.
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Automatic acoustic management
Automatic acoustic management (AAM) is a method for reducing acoustic emanations in AT Attachment (ATA) mass storage devices for computer data storage, such as ATA hard disk drives and ATAPI optical disc drives.
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Auxiliary memory
Auxiliary memory, also known as auxiliary storage, secondary storage, secondary memory or external memory, is a non-volatile memory (does not lose stored data when the device is powered down) that is not directly accessible by the CPU, because it is not accessed via the input/output channels (it is an external device).
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Bad sector
A bad sector is a sector on a computer's disk drive or flash memory that is either inaccessible or unwriteable due to permanent damage, such as physical damage to the disk surface or failed flash memory transistors.
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Binary prefix
A binary prefix is a unit prefix for multiples of units in data processing, data transmission, and digital information, notably the bit and the byte, to indicate multiplication by a power of 2.
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Bit
The bit (a portmanteau of binary digit) is a basic unit of information used in computing and digital communications.
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Bit rate
In telecommunications and computing, bit rate (bitrate or as a variable R) is the number of bits that are conveyed or processed per unit of time.
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Block (data storage)
In computing (specifically data transmission and data storage), a block, sometimes called a physical record, is a sequence of bytes or bits, usually containing some whole number of records, having a maximum length, a block size.
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Bus (computing)
In computer architecture, a bus (a contraction of the Latin omnibus) is a communication system that transfers data between components inside a computer, or between computers.
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Byte
The byte is a unit of digital information that most commonly consists of eight bits, representing a binary number.
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Car
A car (or automobile) is a wheeled motor vehicle used for transportation.
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Carnegie Mellon University
Carnegie Mellon University (commonly known as CMU) is a private research university in Pittsburgh, Pennsylvania.
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Central processing unit
A central processing unit (CPU) is the electronic circuitry within a computer that carries out the instructions of a computer program by performing the basic arithmetic, logical, control and input/output (I/O) operations specified by the instructions.
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Checksum
A checksum is a small-sized datum derived from a block of digital data for the purpose of detecting errors which may have been introduced during its transmission or storage.
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CHKDSK
CHKDSK (short for "check disk") is a system tool in DOS, OS/2 and Windows.
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Cleanroom
A cleanroom or clean room is a situation, ordinarily utilized as a part of assembling, including of pharmaceutical items or logical research, and in addition aviation semiconductor building applications with a low level of natural toxins, for example, tiny, airborne organisms, vaporized particles, and concoction vapors.
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Click of death
Click of death is a term that became common in the late 1990s referring to the clicking sound in disk storage systems that signals a disk drive has failed, often catastrophically.
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Comparison of disk encryption software
This is a technical feature comparison of different disk encryption software.
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Computer data storage
Computer data storage, often called storage or memory, is a technology consisting of computer components and recording media that are used to retain digital data.
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Console application
A console application is a computer program designed to be used via a text-only computer interface, such as a text terminal, the command line interface of some operating systems (Unix, DOS, etc.) or the text-based interface included with most Graphical User Interface (GUI) operating systems, such as the Win32 console in Microsoft Windows, the Terminal in Mac OS X, and xterm in Unix.
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Corrosion
Corrosion is a natural process, which converts a refined metal to a more chemically-stable form, such as its oxide, hydroxide, or sulfide.
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Corvus Systems
Corvus Systems was a technology company founded by Michael D'Addio and Mark Hahn in 1979 and located in San Jose, Silicon Valley, in the United States.
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Count key data
Count key data (CKD) is a direct-access storage device (DASD) data recording format introduced in 1964 by IBM with its IBM System/360 and still being emulated on IBM mainframes.
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Crosstalk
In electronics, crosstalk is any phenomenon by which a signal transmitted on one circuit or channel of a transmission system creates an undesired effect in another circuit or channel.
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Cylinder-head-sector
Cylinder-head-sector (CHS) is an early method for giving addresses to each physical block of data on a hard disk drive.
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Data corruption
Data corruption refers to errors in computer data that occur during writing, reading, storage, transmission, or processing, which introduce unintended changes to the original data.
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Data erasure
Data erasure (sometimes referred to as data clearing or data wiping) is a software-based method of overwriting the data that aims to completely destroy all electronic data residing on a hard disk drive or other digital media by using zeros and ones to overwrite data onto all sectors of the device.
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Data Integrity Field
Data Integrity Field (DIF) was an approach to protect data integrity in computer data storage from data corruption.
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Data recovery
In computing, data recovery is a process of salvaging (retrieving) inaccessible, lost, corrupted, damaged or formatted data from secondary storage, removable media or files, when the data stored in them cannot be accessed in a normal way.
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Data storage
Data storage is the recording (storing) of information (data) in a storage medium.
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Data-rate units
In telecommunications, data-transfer rate is the average number of bits (bitrate), characters or symbols (baudrate), or data blocks per unit time passing through a communication link in a data-transmission system.
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David S. H. Rosenthal
David Stuart Holmes Rosenthal is a British-American computer scientist.
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Defragmentation
In the maintenance of file systems, defragmentation is a process that reduces the amount of fragmentation.
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Density of air
The density of air ρ (Greek: rho) (air density) is the mass per unit volume of Earth's atmosphere.
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Desktop computer
A desktop computer is a personal computer designed for regular use at a single location on or near a desk or table due to its size and power requirements.
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Differential signaling
Differential signaling is a method for electrically transmitting information using two complementary signals.
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Digital data
Digital data, in information theory and information systems, is the discrete, discontinuous representation of information or works.
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Digital signal processor
A digital signal processor (DSP) is a specialized microprocessor (or a SIP block), with its architecture optimized for the operational needs of digital signal processing.
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Digital video recorder
A digital video recorder (DVR) is an electronic device that records video in a digital format to a disk drive, USB flash drive, SD memory card, SSD or other local or networked mass storage device.
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Direct memory access
Direct memory access (DMA) is a feature of computer systems that allows certain hardware subsystems to access main system memory (Random-access memory), independent of the central processing unit (CPU).
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Direct-access storage device
A direct-access storage device (DASD) pronounced) is a secondary storage device in which "each physical record has a discrete location and a unique address." IBM coined the term DASD as a shorthand describing disks, magnetic drums, and data cells. Later, optical disc drives are also classified as DASD. The term DASD contrasts with sequential storage media such as magnetic tape, and unit record equipment such as card devices like card readers and punches. Access methods for DASD include sequential, indexed, and direct. Direct access contrasts with the sequential access method used in tape drives. A record on a DASD can be accessed without having to read through intervening records from the current location, whereas reading anything other than the "next" record on tape requires skipping over intervening records, and requires a proportionally long time to access a distant point in a medium. The DASD storage class includes both fixed and removable media.
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Disk array controller
A disk array controller is a device which manages the physical disk drives and presents them to the computer as logical units.
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Disk buffer
In computer storage, disk buffer (often ambiguously called disk cache or cache buffer) is the embedded memory in a hard disk drive (HDD) acting as a buffer between the rest of the computer and the physical hard disk platter that is used for storage.
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Disk controller
The disk controller is the controller circuit which enables the CPU to communicate with a hard disk, floppy disk or other kind of disk drive.
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Disk enclosure
A disk enclosure is a specialized casing designed to hold and power disk drives while providing a mechanism to allow them to communicate to one or more separate computers.
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Disk pack
Disk packs and disk cartridges were early forms of removable media for computer data storage, introduced in the 1960s.
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Disk partitioning
Disk partitioning or disk slicing is the creation of one or more regions on a hard disk or other secondary storage, so that an operating system can manage information in each region separately.
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Disk read-and-write head
Disk read/write heads are the small parts of a disk drive which move above the disk platter and transform the platter's magnetic field into electrical current (read the disk) or, vice versa, transform electrical current into magnetic field (write the disk).
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Disk sector
In computer disk storage, a sector is a subdivision of a track on a magnetic disk or optical disc.
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Disk storage
Disk storage (also sometimes called drive storage) is a general category of storage mechanisms where data is recorded by various electronic, magnetic, optical, or mechanical changes to a surface layer of one or more rotating disks.
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DOS
DOS is a family of disk operating systems.
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Drag (physics)
In fluid dynamics, drag (sometimes called air resistance, a type of friction, or fluid resistance, another type of friction or fluid friction) is a force acting opposite to the relative motion of any object moving with respect to a surrounding fluid.
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Drive mapping
Drive mapping is how operating systems, such as Microsoft Windows, associate a local drive letter (A through Z) with a shared storage area to another computer (often referred as a File Server) over a network.
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Electrothermal instability
The electrothermal instability (also known as the ionization instability, non-equilibrium instability or Velikhov instability in the literature) is a magnetohydrodynamic (MHD) instability appearing in magnetized non-thermal plasmas used in MHD converters.
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Elsevier
Elsevier is an information and analytics company and one of the world's major providers of scientific, technical, and medical information.
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Enterprise software
Enterprise software, also known as enterprise application software (EAS), is computer software used to satisfy the needs of an organization rather than individual users.
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Error detection and correction
In information theory and coding theory with applications in computer science and telecommunication, error detection and correction or error control are techniques that enable reliable delivery of digital data over unreliable communication channels.
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Error recovery control
In computing, error recovery control (ERC) (Western Digital: time-limited error recovery (TLER), Samsung/Hitachi: command completion time limit (CCTL)) is a feature of hard disks which allow a system administrator to configure the amount of time a drive's firmware is allowed to spend recovering from a read or write error.
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Exabyte
The exabyte is a multiple of the unit byte for digital information.
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Exchange spring media
Exchange spring media (also exchange coupled composite media or ECC) is a magnetic storage technology for hard disk drives that allows to increase the storage density in magnetic recording.
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Federal Reserve Board of Governors
The Board of Governors of the Federal Reserve System, commonly known as the Federal Reserve Board, is the main governing body of the Federal Reserve System.
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Ferromagnetism
Ferromagnetism is the basic mechanism by which certain materials (such as iron) form permanent magnets, or are attracted to magnets.
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Fibre Channel
Fibre Channel, or FC, is a high-speed network technology (commonly running at 1, 2, 4, 8, 16, 32, and 128 gigabit per second rates) providing in-order, lossless delivery of raw block data, primarily used to connect computer data storage to servers.
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File Allocation Table
File Allocation Table (FAT) is a computer file system architecture and a family of industry-standard file systems utilizing it.
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File carving
File carving is the process of reassembling computer files from fragments in the absence of filesystem metadata.
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File server
In computing, a file server (or fileserver) is a computer attached to a network that provides a location for shared disk access, i.e. shared storage of computer files (such as text, image, sound, video) that can be accessed by the workstations that are able to reach the computer that shares the access through a computer network.
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File system
In computing, a file system or filesystem controls how data is stored and retrieved.
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File system fragmentation
In computing, file system fragmentation, sometimes called file system aging, is the tendency of a file system to lay out the contents of files non-continuously to allow in-place modification of their contents.
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Flash memory
Flash memory is an electronic (solid-state) non-volatile computer storage medium that can be electrically erased and reprogrammed.
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Floppy disk
A floppy disk, also called a floppy, diskette, or just disk, is a type of disk storage composed of a disk of thin and flexible magnetic storage medium, sealed in a rectangular plastic enclosure lined with fabric that removes dust particles.
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Flying height
The flying height or floating height or head gap is the distance between the disk read/write head on a hard disk drive and the platter.
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Form factor (design)
Form factor is an aspect of hardware design which defines and prescribes the size, shape, and other physical specifications of components, particularly in consumer electronics and electronic packaging.
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Forward error correction
In telecommunication, information theory, and coding theory, forward error correction (FEC) or channel coding is a technique used for controlling errors in data transmission over unreliable or noisy communication channels.
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Frequency modulation
In telecommunications and signal processing, frequency modulation (FM) is the encoding of information in a carrier wave by varying the instantaneous frequency of the wave.
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Fsck
The system utility fsck (file system consistency check) is a tool for checking the consistency of a file system in Unix and Unix-like operating systems, such as Linux, macOS, and FreeBSD.
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Fujitsu Eagle
The Fujitsu M2351 "Eagle" was a hard disk drive with an SMD interface that was used on many servers in the mid-1980s.
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G-force
The gravitational force, or more commonly, g-force, is a measurement of the type of acceleration that causes a perception of weight.
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Giant magnetoresistance
Giant magnetoresistance (GMR) is a quantum mechanical magnetoresistance effect observed in multilayers composed of alternating ferromagnetic and non-magnetic conductive layers.
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Gibibyte
The gibibyte is a multiple of the unit byte for digital information.
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Gigabyte
The gigabyte is a multiple of the unit byte for digital information.
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Google LLC is an American multinational technology company that specializes in Internet-related services and products, which include online advertising technologies, search engine, cloud computing, software, and hardware.
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Graphical user interface
The graphical user interface (GUI), is a type of user interface that allows users to interact with electronic devices through graphical icons and visual indicators such as secondary notation, instead of text-based user interfaces, typed command labels or text navigation.
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Group coded recording
In computer science, group coded recording or group code recording (GCR) refers to several distinct but related encoding methods for magnetic media.
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GUID Partition Table
GUID Partition Table (GPT) is a standard for the layout of the partition table on a physical storage device used in a desktop or server PC, such as a hard disk drive or solid-state drive, using globally unique identifiers (GUID).
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Hard disk drive failure
A hard disk drive failure occurs when a hard disk drive malfunctions and the stored information cannot be accessed with a properly configured computer.
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Hard disk drive performance characteristics
Higher performance in hard disk drives comes from devices which have better performance characteristics.
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Hard disk drive platter
A hard disk drive platter (or disk) is the circular disk on which magnetic data is stored in a hard disk drive.
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Head crash
A head crash is a hard-disk failure that occurs when a read–write head of a hard disk drive comes in contact with its rotating platter, resulting in permanent and usually irreparable damage to the magnetic media on the platter surface.
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Heat-assisted magnetic recording
Heat-assisted magnetic recording (HAMR) is a magnetic storage technology for greatly increasing the amount of data that can be stored on a magnetic device such as a hard disk drive.
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HGST
HGST, Inc. (formerly Hitachi Global Storage Technologies) is a wholly owned subsidiary of Western Digital that sells hard disk drives, solid-state drives, and external storage products and services.
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History of general-purpose CPUs
The history of general-purpose CPUs is a continuation of the earlier history of computing hardware.
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History of IBM magnetic disk drives
IBM manufactured magnetic disk storage devices from 1956 to 2003, when it sold its hard disk drive business to Hitachi.
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Host adapter
In computer hardware, a host controller, host adapter, or host bus adapter (HBA) connects a computer, which acts as the host system, to other network and storage devices.
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Hybrid drive
In computing, a hybrid drive (solid state hybrid drive – SSHD) is a logical or physical storage device that combines a faster storage medium such as solid-state drive (SSD) with a higher-capacity hard disk drive (HDD).
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IBM
The International Business Machines Corporation (IBM) is an American multinational technology company headquartered in Armonk, New York, United States, with operations in over 170 countries.
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IBM Personal Computer XT
The IBM Personal Computer XT, often shortened to the IBM XT, PC XT, or simply XT, is a version of the IBM PC with a built-in hard drive.
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IEEE 1394
IEEE 1394 is an interface standard for a serial bus for high-speed communications and isochronous real-time data transfer.
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Inch
The inch (abbreviation: in or &Prime) is a unit of length in the (British) imperial and United States customary systems of measurement now formally equal to yard but usually understood as of a foot.
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Inode
The inode is a data structure in a Unix-style file system that describes a filesystem object such as a file or a directory.
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Institute of Electrical and Electronics Engineers
The Institute of Electrical and Electronics Engineers (IEEE) is a professional association with its corporate office in New York City and its operations center in Piscataway, New Jersey.
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Interface (computing)
In computing, an interface is a shared boundary across which two or more separate components of a computer system exchange information.
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International System of Units
The International System of Units (SI, abbreviated from the French Système international (d'unités)) is the modern form of the metric system, and is the most widely used system of measurement.
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ISCSI
In computing, iSCSI is an acronym for Internet Small Computer Systems Interface, an Internet Protocol (IP)-based storage networking standard for linking data storage facilities.
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Latency (engineering)
Latency is a time interval between the stimulation and response, or, from a more general point of view, a time delay between the cause and the effect of some physical change in the system being observed.
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LocalTalk
LocalTalk is a particular implementation of the physical layer of the AppleTalk networking system from Apple Computer.
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Logical block addressing
Logical block addressing (LBA) is a common scheme used for specifying the location of blocks of data stored on computer storage devices, generally secondary storage systems such as hard disk drives.
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Loudspeaker
A loudspeaker (or loud-speaker or speaker) is an electroacoustic transducer; which converts an electrical audio signal into a corresponding sound.
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Low-density parity-check code
In information theory, a low-density parity-check (LDPC) code is a linear error correcting code, a method of transmitting a message over a noisy transmission channel.
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LWN.net
LWN.net is a computing webzine with an emphasis on free software and software for Linux and other Unix-like operating systems.
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Mac OS X Snow Leopard
Mac OS X Snow Leopard (version 10.6) is the seventh major release of Mac OS X (now named macOS), Apple's desktop and server operating system for Macintosh computers.
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Macintosh
The Macintosh (pronounced as; branded as Mac since 1998) is a family of personal computers designed, manufactured, and sold by Apple Inc. since January 1984.
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Macintosh 128K
The Macintosh 128K, originally released as the Apple Macintosh, is the original Apple Macintosh personal computer.
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Macintosh 512K
The Macintosh 512K is a personal computer that was designed, manufactured and sold by Apple Computer, inc. from September 1984 to April 1986.
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Macintosh Plus
The Macintosh Plus computer is the third model in the Macintosh line, introduced on January 16, 1986, two years after the original Macintosh and a little more than a year after the Macintosh 512K, with a price tag of US$2599.
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MacOS
macOS (previously and later) is a series of graphical operating systems developed and marketed by Apple Inc. since 2001.
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Magnet
A magnet is a material or object that produces a magnetic field.
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Magnet wire
Magnet wire or enameled wire is a copper or aluminium wire coated with a very thin layer of insulation.
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Magnetic cartridge
A magnetic cartridge, more commonly called a phonograph cartridge or phono cartridge or (colloquially) a pickup, is an electromechanical transducer used in the playback of analog sound recordings called records on a record player, now commonly called a turntable because of its most prominent component but formally known as a phonograph in the US and a gramophone in the UK.
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Magnetic field
A magnetic field is a vector field that describes the magnetic influence of electrical currents and magnetized materials.
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Magnetic storage
Magnetic storage or magnetic recording is the storage of data on a magnetized medium.
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Magnetic tape
Magnetic tape is a medium for magnetic recording, made of a thin, magnetizable coating on a long, narrow strip of plastic film.
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Mainframe computer
Mainframe computers (colloquially referred to as "big iron") are computers used primarily by large organizations for critical applications; bulk data processing, such as census, industry and consumer statistics, enterprise resource planning; and transaction processing.
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Mass storage
In computing, mass storage refers to the storage of large amounts of data in a persisting and machine-readable fashion.
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Master boot record
A master boot record (MBR) is a special type of boot sector at the very beginning of partitioned computer mass storage devices like fixed disks or removable drives intended for use with IBM PC-compatible systems and beyond.
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Mean time between failures
Mean time between failures (MTBF) is the predicted elapsed time between inherent failures of a mechanical or electronic system, during normal system operation.
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Megabyte
The megabyte is a multiple of the unit byte for digital information.
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Metadata
Metadata is "data that provides information about other data".
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Microdrive
Microdrive is a registered trademark for miniature, 1-inch hard disks produced by IBM and Hitachi.
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Microsoft Windows
Microsoft Windows is a group of several graphical operating system families, all of which are developed, marketed, and sold by Microsoft.
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Modified Frequency Modulation
Modified Frequency Modulation, commonly MFM, is a run-length limited (RLL) coding scheme used to encode the actual data-bits on most floppy disks.
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Moore's law
Moore's law is the observation that the number of transistors in a dense integrated circuit doubles about every two years.
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Nanometre
The nanometre (International spelling as used by the International Bureau of Weights and Measures; SI symbol: nm) or nanometer (American spelling) is a unit of length in the metric system, equal to one billionth (short scale) of a metre (m).
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Neodymium magnet
A neodymium magnet (also known as NdFeB, NIB or Neo magnet), the most widely used type of rare-earth magnet, is a permanent magnet made from an alloy of neodymium, iron and boron to form the Nd2Fe14B tetragonal crystalline structure.
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Noisy-channel coding theorem
In information theory, the noisy-channel coding theorem (sometimes Shannon's theorem or Shannon's limit), establishes that for any given degree of noise contamination of a communication channel, it is possible to communicate discrete data (digital information) nearly error-free up to a computable maximum rate through the channel.
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Non-volatile memory
Non-volatile memory (NVM) or non-volatile storage is a type of computer memory that can retrieve stored information even after having been power cycled.
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Object storage
Object storage (also known as object-based storage) is a computer data storage architecture that manages data as objects, as opposed to other storage architectures like file systems which manage data as a file hierarchy, and block storage which manages data as blocks within sectors and tracks.
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Operating system
An operating system (OS) is system software that manages computer hardware and software resources and provides common services for computer programs.
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Oracle Corporation
Oracle Corporation is an American multinational computer technology corporation, headquartered in Redwood Shores, California.
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Parallel ATA
Parallel ATA (PATA), originally, is an interface standard for the connection of storage devices such as hard disk drives, floppy disk drives, and optical disc drives in computers.
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Partial-response maximum-likelihood
In computer data storage, partial-response maximum-likelihood (PRML) is a method for converting a weak analog signal from the head of a magnetic disk or tape drive into a digital signal.
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Patterned media
Patterned media (also known as bit-patterned media or BPM) is a potential future hard disk drive technology to record data in magnetic islands (one bit per island), as opposed to current hard disk drive technology where each bit is stored in 20-30 magnetic grains within a continuous magnetic film.
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PC Magazine
PC Magazine (shortened as PCMag) is an American computer magazine published by Ziff Davis.
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Perpendicular recording
Perpendicular recording (or perpendicular magnetic recording, PMR) is a technology for data recording on hard disks.
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Personal computer
A personal computer (PC) is a multi-purpose computer whose size, capabilities, and price make it feasible for individual use.
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Plug and play
In computing, a plug and play (PnP) device or computer bus, is one with a specification that facilitates the discovery of a hardware component in a system without the need for physical device configuration or user intervention in resolving resource conflicts.
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Price elasticity of demand
Price elasticity of demand (PED or Ed) is a measure used in economics to show the responsiveness, or elasticity, of the quantity demanded of a good or service to a change in its price when nothing but the price changes.
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Price index
A price index (plural: “price indices” or “price indexes”) is a normalized average (typically a weighted average) of price relatives for a given class of goods or services in a given region, during a given interval of time.
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Printed circuit board
A printed circuit board (PCB) mechanically supports and electrically connects electronic components or electrical components using conductive tracks, pads and other features etched from one or more sheet layers of copper laminated onto and/or between sheet layers of a non-conductive substrate.
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RAID
RAID (Redundant Array of Independent Disks, originally Redundant Array of Inexpensive Disks) is a data storage virtualization technology that combines multiple physical disk drive components into one or more logical units for the purposes of data redundancy, performance improvement, or both.
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Random access
In computer science, random access (more precisely and more generally called direct access) is the ability to access any item of data from a population of addressable elements roughly as easily and efficiently as any other, no matter how many elements may be in the set.
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Reed–Solomon error correction
Reed–Solomon codes are a group of error-correcting codes that were introduced by Irving S. Reed and Gustave Solomon in 1960.
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Revolutions per minute
Revolutions per minute (abbreviated rpm, RPM, rev/min, r/min) is the number of turns in one minute.
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Reynold B. Johnson
Reynold B. Johnson (July 16, 1906September 15, 1998) was an American inventor and computer pioneer.
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RK05
The RK05 DECpack was a moving head magnetic disk drive manufactured by the Digital Equipment Corporation of Maynard, Massachusetts.
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Rotational speed
Rotational speed (or speed of revolution) of an object rotating around an axis is the number of turns of the object divided by time, specified as revolutions per minute (rpm), cycles per second (cps), radians per second (rad/s), etc..
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RS-422
RS-422, also known as TIA/EIA-422, is a technical standard originated by the Electronic Industries Alliance that specifies electrical characteristics of a digital signaling circuit.
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RS-485
RS-485, also known as TIA-485(-A), EIA-485, is a standard defining the electrical characteristics of drivers and receivers for use in serial communications systems. Electrical signaling is balanced, and multipoint systems are supported. The standard is jointly published by the Telecommunications Industry Association and Electronic Industries Alliance (TIA/EIA). Digital communications networks implementing the standard can be used effectively over long distances and in electrically noisy environments. Multiple receivers may be connected to such a network in a linear, multidrop bus. These characteristics make RS-485 useful in industrial control systems and similar applications.
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Run-length limited
Run-length limited or RLL coding is a line coding technique that is used to send arbitrary data over a communications channel with bandwidth limits.
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Ruthenium
Ruthenium is a chemical element with symbol Ru and atomic number 44.
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S.M.A.R.T.
S.M.A.R.T. (Self-Monitoring, Analysis and Reporting Technology; often written as SMART) is a monitoring system included in computer hard disk drives (HDDs), solid-state drives (SSDs), and eMMC drives.
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SCSI
Small Computer System Interface (SCSI) is a set of standards for physically connecting and transferring data between computers and peripheral devices.
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Seagate Technology
Seagate Technology PLC (commonly referred to as Seagate) is an American data storage company.
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Sequential access
In computer science, sequential access means that a group of elements (such as data in a memory array or a disk file or on magnetic tape data storage) is accessed in a predetermined, ordered sequence.
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Serial ATA
Serial ATA (SATA, abbreviated from Serial AT Attachment) is a computer bus interface that connects host bus adapters to mass storage devices such as hard disk drives, optical drives, and solid-state drives.
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Serial Attached SCSI
In computing, Serial Attached SCSI (SAS) is a point-to-point serial protocol that moves data to and from computer-storage devices such as hard drives and tape drives.
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Server (computing)
In computing, a server is a computer program or a device that provides functionality for other programs or devices, called "clients".
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Servomotor
A servomotor is a rotary actuator or linear actuator that allows for precise control of angular or linear position, velocity and acceleration.
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Shared resource
In computing, a shared resource, or network share, is a computer resource made available from one host to other hosts on a computer network.
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Shingled magnetic recording
Shingled magnetic recording (SMR) is a magnetic storage data recording technology used in hard disk drives (HDDs) to increase storage density and overall per-drive storage capacity.
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Solid-state drive
A solid-state drive (SSD) is a solid-state storage device that uses integrated circuit assemblies as memory to store data persistently.
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Square inch
A square inch (plural: square inches) is a unit of area, equal to the area of a square with sides of one inch.
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Stepper motor
A stepper motor or step motor or stepping motor is a brushless DC electric motor that divides a full rotation into a number of equal steps.
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Storage area network
A storage area network (SAN) is a Computer network which provides access to consolidated, block level data storage.
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Superparamagnetism
Superparamagnetism is a form of magnetism which appears in small ferromagnetic or ferrimagnetic nanoparticles.
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Tallgrass Technologies
Tallgrass Technologies Corporation was the first manufacturer to offer a hard disk drive product for the IBM PC.
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Terabyte
The terabyte is a multiple of the unit byte for digital information.
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Throughput
In general terms, throughput is the maximum rate of production or the maximum rate at which something can be processed.
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Tom's Hardware
Tom's Hardware is an online publication owned by Purch Group and focused on technology.
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Toshiba
, commonly known as Toshiba, is a Japanese multinational conglomerate headquartered in Tokyo, Japan.
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Unit prefix
A unit prefix is a specifier or mnemonic that is prepended to units of measurement to indicate multiples or fractions of the units.
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Unix
Unix (trademarked as UNIX) is a family of multitasking, multiuser computer operating systems that derive from the original AT&T Unix, development starting in the 1970s at the Bell Labs research center by Ken Thompson, Dennis Ritchie, and others.
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Unix-like
A Unix-like (sometimes referred to as UN*X or *nix) operating system is one that behaves in a manner similar to a Unix system, while not necessarily conforming to or being certified to any version of the Single UNIX Specification.
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USB
USB (abbreviation of Universal Serial Bus), is an industry standard that was developed to define cables, connectors and protocols for connection, communication, and power supply between personal computers and their peripheral devices.
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Voice coil
A voice coil (consisting of a former, collar, and winding) is the coil of wire attached to the apex of a loudspeaker cone.
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Western Digital
Western Digital Corporation (abbreviated WDC, commonly shortened to Western Digital or WD) is an American computer data storage company and one of the largest computer hard disk drive manufacturers in the world, along with its main competitor Seagate Technology.
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Western Digital Raptor
The Western Digital Raptor (often marketed as WD Raptor or VelociRaptor) is a series of high performance hard disk drives produced by Western Digital first marketed in 2003.
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Write precompensation
Write precompensation (abbreviated WPcom in the literature) is a technical aspect of the design of hard disks, floppy disks and other digital magnetic recording devices.
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Zone bit recording
In computer storage, zone bit recording (ZBR) is a method used by disk drives to optimise the tracks for increased data capacity.
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19-inch rack
A 19-inch rack is a standardized frame or enclosure for mounting multiple electronic equipment modules.
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2011 Thailand floods
Severe flooding occurred during the 2011 monsoon season in Thailand.
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References
[1] https://en.wikipedia.org/wiki/Hard_disk_drive
