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disk drive

disk drive (disk unit) A device with read/write heads and associated electronics that can store and retrieve data from one or more rapidly rotating magnetic disks. The disks may be hard disks or floppy disks. The term can also be applied to devices operating with optical disks.

In a magnetic disk drive the data is recorded on one or both sides of a disk in a set of concentric tracks, which are usually subdivided into sectors. The read/write heads of the disk drive are mounted on arms that can be moved, by means of an actuator, to position the heads accurately over the required track. As the disk rotates, the sectors on that track are made accessible. Storage locations can be accessed directly and in any order; typical seek times are in the range 8–20 milliseconds while the latency may be 8 milliseconds. The data is encoded according to a particular disk format. See also access time, fixed disk drive, floppy-disk drive, disk array, RAID.

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"disk drive." A Dictionary of Computing. . Encyclopedia.com. 17 Aug. 2017 <http://www.encyclopedia.com>.

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"disk drive." A Dictionary of Computing. . Retrieved August 17, 2017 from Encyclopedia.com: http://www.encyclopedia.com/computing/dictionaries-thesauruses-pictures-and-press-releases/disk-drive

disk drive

disk drive • n. a device that allows a computer to read from and write to computer disks.

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"disk drive." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. 17 Aug. 2017 <http://www.encyclopedia.com>.

"disk drive." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. (August 17, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/disk-drive

"disk drive." The Oxford Pocket Dictionary of Current English. . Retrieved August 17, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/disk-drive