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The capacity of a hard disk drive, as reported by an operating system to the end user, is smaller than the amount stated by the manufacturer for several reasons, e.g. the operating system using some space, use of some space for data redundancy, space use for file system structures.
(The spelling disk and disc are used interchangeably except where trademarks preclude one usage, e.g., the Compact Disc logo. The choice of a particular form is frequently historical, as in IBM's usage of the disk form beginning in 1956 with the "IBM 350 disk storage unit".) Six hard disk drives Three floppy disk drives A CD-ROM (optical) disc ...
Enhanced Small Disk Interface (ESDI) was an attempt to minimize controller design time by supporting multiple data rates with a standard data encoding scheme; this was usually negotiated automatically by the disk drive and controller; most of the time, however, 15 or 20 megabit ESDI disk drives were not downward compatible (i.e. a 15 or 20 ...
Hard disk with platter Inside view of a hard disk Hard disk drive platter, 2.5" Samsung MP0402H. A hard disk drive platter or hard disk is the circular magnetic disk on which digital data is stored in a hard disk drive. [1] The rigid nature of the platters is what gives them their name (as opposed to the flexible materials which are used to ...
However, by the late 1980s, hard disk drives were standard on all but the cheapest PC and floppy disks were used almost solely as transport media. Most hard disk drives in the early 1980s were sold to PC end users by systems integrators such as the Corvus Disk System or the systems manufacturer such as the Apple ProFile.
Floppy disk, used for off-line storage; Hard disk drive, used for secondary storage. Magnetic tape, used for tertiary and off-line storage; Carousel memory (magnetic rolls). In early computers, magnetic storage was also used as: Primary storage in a form of magnetic memory, or core memory, core rope memory, thin-film memory and/or twistor memory;
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