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5.75 in × 3.25 in × 8 in (146.1 mm × 82.55 mm × 203 mm). This smaller form factor, first used in an HDD by Seagate in 1980, was the same size as full-height 51⁄4 -inch-diameter (130 mm) FDD, 3.25-inches high. This is twice as high as "half height"; i.e., 1.63 in (41.4 mm). Most desktop models of drives for optical 120 mm disks (DVD, CD ...
2011 - Samsung announces 1 TB of capacity per 3.5 inch hard drive platter. [61] 2012 – TDK demonstrates 2 TB on a single 3.5-inch platter [62] 2012 – WDC acquires HGST operating it as a wholly owned subsidiary. WDC then provides rights to Toshiba, [63] allowing it to re-enter the 3.5-inch desktop hard disk drive market. [64]
HDDs are a type of non-volatile storage, retaining stored data when powered off. [2][3][4] Modern HDDs are typically in the form of a small rectangular box. Hard disk drives were introduced by IBM in 1956, [5] and were the dominant secondary storage device for general-purpose computers beginning in the early 1960s.
For example, the first commercial hard drive, IBM's RAMAC in 1957, supplied 3.75 MB for $34,500, or $9,200 per megabyte. In 1989, a 40 MB hard drive cost $1200, or $30/MB. And in 2018, 4 Tb drives sold for $75, or 1.9¢/GB, an improvement of 1.5 million since 1989 and 520 million since the RAMAC.
Broadcom Inc. (ARM-based, e.g. for Raspberry Pi) Fujitsu (its ARM-based CPU used in top supercomputer, still also sells its SPARC-based servers) Hitachi (its own designs and ARM) Hygon Information Technology (x86-based) Loongson (MIPS-based) HiSilicon (acquired by Huawei), stopped making its ARM-based design.
On October 17, 1994, IBM's Storage Systems division announced three new families of hard disk drives, the Travelstar 2 1 ⁄ 2-inch family for notebooks, the Deskstar 3 1 ⁄ 2-inch family for desktop applications and the Ultrastar 3 1 ⁄ 2-inch family for high performance computer system applications.