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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.
Orb Drive – external SCSI. The Orb Drive is a 3.5-inch removable hard-disk drive introduced by Castlewood Systems in 1999. Its original capacity was 2.2 GB. A later version of the drive was introduced in 2001 with a capacity of 5.7 GB. Manufacturing of this product ceased in 2004. Orb Drive – external SCSI – back Orb Drive – 2.2 GB ...
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 variants are referred to as desktop external drives. "Portable" drives are packaged in smaller and lighter enclosures than the "desktop" drives; additionally, "portable" drives use power provided by the USB ...
A 2.5-inch solid-state drive (SSD) For 2.5-inch bays, actual dimensions are 2 + 3 ⁄ 4 inches (69.9 mm) wide, between 5 millimetres (0.20 in) and 3 ⁄ 4 inch (19.1 mm) high, and 3.955 inches (100.5 mm) deep. However, most laptops have drive bays smaller than the 15 mm specification. 2.5-inch hard drives may range from 7 mm to 15 mm in height.
In 1993, Seagate released the first Barracuda drive, with the ST11950. The drive had a capacity of 2.03 GB (1.69 GB formatted), was available with FAST SCSI-2 (N/ND models) or WIDE SCSI-2 (W/WD models) interface, and was the first hard drive ever to have a spindle speed of 7200-RPM.
The Macintosh external drives were the first to widely introduce Sony's new 3 + 1 ⁄ 2-inch rigid disk standard commercially and throughout their product line. Apple produced only one external 3 + 1 ⁄ 2-inch drive exclusively for use with the Apple II series called the Apple UniDisk 3.5.