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8-, 5.25-, 3.5-, 2.5-, 1.8- and 1-inch HDDs, together with a ruler to show the length of platters and read-write heads A newer 2.5-inch (63.5 mm) 6,495 MB HDD compared to an older 5.25-inch full-height 110 MB HDD. IBM's first hard drive, the IBM 350, used a stack of fifty 24-inch platters and was of a size comparable to two large refrigerators.
A 5.25-inch DVD drive. 5.25-inch drive bays are divided into two height specifications, full-height and half-height. Full-height bays were found in old PCs in the early to mid-1980s. 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 ...
1980 – Seagate releases the first 5.25-inch hard drive, the ST-506; [36] it had a 5-megabyte capacity, weighed 5 pounds (2.3 kilograms), and cost US$1,500 [37] 1982 – HP 7935 404 megabyte, 7-platter hard drive for minicomputers, HP-IB bus, $27,000; 1983 – RO351/RO352 first 3 1 ⁄ 2 inch drive released with capacity of 10 megabytes [38]
External hard disk drives are usually available as assembled integrated products, but may be also assembled by combining an external enclosure (with USB or other interface) with a separately purchased drive. They are available in 2.5-inch and 3.5-inch sizes; 2.5-inch variants are typically called portable external drives, while 3.5-inch ...
Hard drive: partition size max Native support: File systems Native support: floppy capacities 3.5" Native support: floppy capacities 5.25" Native support: floppy capacities 8.0" Integrated disk compression utility Native support: long file names 86-DOS 0.42-1.00 — FAT12; (CP/M 2 through RDCPM) — NorthStar 87.5 KB; Cromemco 90 KB
The ST-506 HDD was the first 5.25 inch hard disk drive, introduced in 1980 [3] by Shugart Technology (now Seagate Technology).It stored up to 5 megabytes after formatting (153 cylinders, 4 heads, 32 sectors/track, 256 bytes/sector) [4] and cost US$1,500 (equivalent to $5,547 in 2023). [5]