IBM – hard disk drive business acquired by Hitachi Global Storage Technologies in 2002.Hitachi Global Storage Technologies (HGST) – 2002 merger of Hitachi and IBM disk drive businesses, sold to Western Digital in 2012 with part of 3.5″ manufacturing facilities going to Toshiba.Hewlett-Packard (HP) - 1976 to 1996, left industry.Fujitsu – HDD division acquired by Toshiba in July 2009.DZU (of Bulgaria) – converted from government-owned to private, and sold to Videoton in 1999.
Digital Equipment Corporation (DEC) – sold hard disk drive business to Quantum Corporation in 1994.Diablo Systems - became Diablo Data Systems in 1972.Control Data Corporation (CDC) / Imprimis Technology – sold hard disk drive business to Seagate in 1989.Conner Peripherals – merged with Seagate in 1996.Burroughs Corporation – merged with Sperry Corporation to form Unisys in 1986.Areal Technology – acquired by Tomen Corp in 1993.
Some of the defunct manufacturers include:
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