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The format was standardized as EIA-741 and co-published as SFF-8501 for disk drives, with other SFF-85xx series standards covering related 5.25 inch devices (optical drives, etc.) [33] The Quantum Bigfoot HDD was the last to use it in the late 1990s, with "low-profile" (≈25 mm) and "ultra-low-profile" (≈20 mm) high versions.
Special pages; Printable version; ... Image renamed from Image:Hard drive.svg ... The following 3 pages use this file: Hard disk drive; User:Hripsime Ashikyan; User ...
For example, the highest capacity disk drive listed and plotted for 1981 is 26MB while the actual highest capacity HDD then offered was the IBM 3380 at 2,520 MB per disk drive (2 HDAs per disk drive box). By the late 90s high performance drives were readily available at retail. Tom94022 06:10, 25 March 2009 (UTC)
They were 3 + 1 ⁄ 4 inches (82.6 mm) high, 5 + 3 ⁄ 4 inches (146.1 mm) wide, and up to 8 inches (203.2 mm) deep, used mainly for hard disk drives and floppy disk drives. This is the size of the internal (screwed) part of the bay, as the front side is actually 5 + 7 ⁄ 8 inches (149.2 mm). The difference between those widths and the name of ...
Also in 1962, IBM introduced the model 1311 disk drive, which was about the size of a washing machine and stored two million characters on a removable disk pack. Users could buy additional packs and interchange them as needed, much like reels of magnetic tape. Later models of removable pack drives, from IBM and others, became the norm in most ...
In computer file systems, a cluster (sometimes also called allocation unit or block) is a unit of disk space allocation for files and directories.To reduce the overhead of managing on-disk data structures, the filesystem does not allocate individual disk sectors by default, but contiguous groups of sectors, called clusters.
Fixed-block architecture (FBA) is an IBM term for the hard disk drive (HDD) layout in which each addressable block (more commonly, sector) on the disk has the same size, utilizing 4 byte block numbers and a new set of command codes. [1]
drive: 1, diskette: 2 16 8 512 2× 64 kB 270 GCR (4/5) Internally based on FDU-250 Micro Floppy Disk Drive Unit [2] Thomson: 5 1 ⁄ 4 inch Single 1 40 16 128 80 kB 300 FM Thomson UD90.070 Double 2 256 320 kB MFM Thomson DD90-320 [NB 17] 3 1 ⁄ 2 inch Double 1 80 16 256 320 kB 300 MFM Thomson TO9, Thomson DD09-350 Double 2 640 kB