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Factory-assembled Buffalo external hard drive in a disk enclosure. Multiple drives: RAID-enabled enclosures and iSCSI enclosures commonly hold multiple drives. High-end and server-oriented chassis are often built around 3.5-in drives in hot-swappable drive caddies. "5.25-inch" drive: (5.75 in × 8 in × 1.63 in = 146.1 mm × 203 mm × 41.4 mm)
Nearly every brand new computer case comes with a bag of these. They are commonly used for the following purposes, however there are many exceptions: securing a power supply to the case; securing a 3.5-inch hard disk drive to the case; holding an expansion card in place by its metal slot cover; fastening case components to one another
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.
8.0-inch drive bays were found in early IBM computers, CP/M computers, and the TRS-80 Model II.They were 4 + 5 ⁄ 8 inches (117.5 mm) high, 9 + 1 ⁄ 2 inches (241.3 mm) wide, and approximately 14 + 1 ⁄ 4 inches (361.9 mm) deep, and were used for hard disk drives and floppy disk drives.
Circuit board of a 2.5-inch Samsung hard disk MP0402H. A typical HDD has two electric motors: a spindle motor that spins the disks and an actuator (motor) that positions the read/write head assembly across the spinning disks. The disk motor has an external rotor attached to the disks; the stator windings are fixed in place.
For general computer use, the 2.5-inch form factor (typically found in laptops and used for most SATA SSDs) is the most popular, in three thicknesses [98] (7.0mm, 9.5mm, 14.8 or 15.0mm; with 12.0mm also available for some models). For desktop computers with 3.5-inch hard disk drive slots, a simple adapter plate can be used to make such a drive fit.