![]() ![]() Drives 9.5 mm high became an unofficial standard for all except the largest-capacity laptop drives (usually having two platters inside) 12.5 mm-high drives, typically with three platters, are used for maximum capacity, but will not fit most laptop computers. It is also used in the PlayStation 3 and Xbox 360 video game consoles. It came to be widely used for HDDs in mobile devices (laptops, music players, etc.) and for solid-state drives (SSDs), by 2008 replacing some 3.5 inch enterprise-class drives. The 2.5-inch drive format is standardized in the EIA/ECA-720 co-published as SFF-8201 when used with specific connectors, more detailed specifications are SFF-8212 for the 50-pin (ATA laptop) connector, SFF-8223 with the SATA, or SAS connector and SFF-8222 with the SCA-2 connector. This smaller form factor was introduced by PrairieTek in 1988 there is no corresponding FDD. At least Samsung made a low-profile single-disc drive with a height of only 18.288 mm (0.72 in). At least Seagate made 19.99-mm-high drives too. The format was standardized in terms of dimensions and positions of mounting holes as EIA/ECA-740, co-published as SFF-8301. ![]() Today, the 1-inch high ("slimline" or "low-profile") version of this form factor is the most popular form used in most desktops. This smaller form factor is similar to that used in an HDD by Rodime in 1983, which was the same size as the "half height" 3½" FDD, i.e., 1.63 inches high. 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.) 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. Most desktop models of drives for optical 120 mm disks (DVD, CD) use the half height 5¼" dimension, but it fell out of fashion for HDDs. ![]() This is twice as high as "half height" i.e., 1.63 in (41.4 mm). This smaller form factor, first used in an HDD by Seagate in 1980, was the same size as full-height 5 + 1⁄ 4-inch-diameter (130 mm) FDD, 3.25-inches high. In 1979, Shugart Associates' SA1000 was the first form factor compatible HDD, having the same dimensions and a compatible interface to the 8" FDD. Because there were no smaller floppy disk drives, smaller HDD form factors developed from product offerings or industry standards.Ĩ-inch 9.5 in × 4.624 in × 14.25 in ( 241.3 mm × 117.5 mm × 362 mm). Thus HDD Form factors, initially followed those of 8-inch, 5.25-inch, and 3.5-inch floppy disk drives. With increasing sales of microcomputers having built in floppy-disk drives (FDDs), HDDs that would fit to the FDD mountings became desirable. Such large platters were never used with microprocessor-based systems. In the mid-to-late 1980s the similarly sized Fujitsu Eagle, which used (coincidentally) 10.5-inch platters, was a popular product. Digital's RK05 and RL01 were early examples using single 14-inch platters in removable packs, the entire drive fitting in a 10.5-inch-high rack space (six rack units). Later drives were designed to fit entirely into a chassis that would mount in a 19-inch rack. The IBM 2314 used platters of the same size in an eleven-high pack and introduced the "drive in a drawer" layout, although the "drawer" was not the complete drive. This became a standard platter size and drive form-factor for many years, used also by other manufacturers. In 1962, IBM introduced its model 1311 disk, which used six 14-inch (nominal size) platters in a removable pack and was roughly the size of a washing machine. 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. (Dimension in inches unless otherwise noted)Ī newer 2.5-inch (63.5 mm) 6,495 MB HDD compared to an older 5.25-inch full-height 110 MB HDD ![]() Drives may slot into a drive bay of the corresponding size.Ĭompared to flash drives in same form factor, maximum rotating disk drive capacity is much smaller, with 100 TB available in 2018, and 32 TB for 2.5-inch. Standardized form factors and interface allow a variety of peripherals and upgrades thereto with no impact to the physical size of a computer system. Since the invention of the floppy disk drive, various standardized form factors have been used in computing systems. ![]()
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