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In the 1950s, introduction of magnetic tapes and hard disk drives allowed for mass external storage of information, which played the key part of the computer revolution. [6] Initially all external storage, tape and hard disk drives are today available as both internal and external storage.
The capacity of hard drives has grown exponentially over time. When hard drives became available for personal computers, they offered 5-megabyte capacity. During the mid-1990s the typical hard disk drive for a PC had a capacity in the range of 500 megabyte to 1 gigabyte. [6] As of February 2025 hard disk drives up to 36 TB were available. [7]
Enterprise-class drives can have a height up to 15 mm. Seagate released a 7 mm drive aimed at entry level laptops and high end netbooks in December 2009. Western Digital released on April 23, 2013 a hard drive 5 mm in height specifically aimed at Ultrabooks. [37] Toshiba MK1216GSG 1.8" 120 GB hard disk drive with Micro SATA
Western Digital My Book external hard drive. My Book is a series of external hard drives produced by Western Digital.There are at least nine series of My Book drives: Essential Edition, Home Edition, Office Edition, Mirror Edition, Studio Edition, Premium Edition, Elite Edition, Pro Edition, AV DVR "Live Edition", and the World Edition.
SparQ drive/SparQ disk – 1.0 GB 3.5" removable-disk hard drive. Lower cost per MB than the SyJet. Quest drive/Quest disc – a 4.7 GB removable-disk hard drive. PC Magazine definition. Available for a short time in 1998. The 5.25" removable-disk hard drives with 44 MB, 88 MB, and 200 MB capacities were mostly used on Macintosh systems via the ...
External hard disk drives are usually available as assembled integrated products, but may be also assembled by combining an external enclosure (with USB or other interface) with a separately purchased drive. 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 ...