The first hard disk drive for personal computers, introduced in 1979 by Seagate. It was used in drives of 40MB and less and transferred data at 625 KBytes/sec, using the MFM encoding method. See ST412 and hard disk.

Introduced in 1979, Seagate's ST506 was the first hard disk drive for personal computers. This 5.25" full-height drive held 5MB and became an industry standard used in CP/M machines and, later, the IBM PC and its successors. (Image courtesy of Seagate Technology, Inc.)
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