Disk sector and Hard disk drive

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Difference between Disk sector and Hard disk drive

Disk sector vs. Hard disk drive

In computer disk storage, a sector is a subdivision of a track on a magnetic disk or optical disc. A hard disk drive (HDD), hard disk, hard drive or fixed disk is an electromechanical data storage device that uses magnetic storage to store and retrieve digital information using one or more rigid rapidly rotating disks (platters) coated with magnetic material.

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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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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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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Byte

The byte is a unit of digital information that most commonly consists of eight bits, representing a binary number.

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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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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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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 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 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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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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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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Magnetic storage

Magnetic storage or magnetic recording is the storage of data on a magnetized medium.

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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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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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