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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.
This smaller, 4-inch-wide (100 mm) disk-drive form factor was introduced with the Apple Macintosh series in 1984, and later adopted throughout the industry beginning widely with the IBM PS/2 series in 1987, which included drives of this size for 90-mm ("3.5-inch") floppy disks. This form factor is today used by most desktop hard drives.
A hybrid drive (solid state hybrid drive – SSHD, and dual-storage drive) is a logical or physical computer storage device that combines a faster storage medium such as solid-state drive (SSD) with a higher-capacity hard disk drive (HDD). The intent is adding some of the speed of SSDs to the cost-effective storage capacity of traditional HDDs.
Sony eventually released the first commercial erasable and rewritable 5 + 1 ⁄ 4-inch optical disc drive in 1987, [56] with dual-sided discs capable of holding 325 MB per side. [ 57 ] The CD-ROM format was developed by Sony and Denon , introduced in 1984, as an extension of Compact Disc Digital Audio and adapted to hold any form of digital data.
Cadillac 4.1 L engine. A new lighter V8 engine was rushed into production for 1982, the HT-4100 (option code LT8).It was a 4100 cc V8, designed for rear-wheel drive and longitudinal front-wheel drive applications sharing the same transmission bellhousing pattern as Buick, Oldsmobile, and Pontiac engine equipped rear wheel drive vehicles.
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