Storage Module Device
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Storage Module Device (SMD) was a family of storage devices (hard disk drives) first shipped by Control Data Corporation in December 1973 as the CDC 9760 40 MByte (unformatted) storage module disk drive[1] . The CDC 9762 80 MByte variant was announced in June 1974[1] and the CDC 9764 150 MByte and the CDC 9766 300 MByte variants were announced in 1975[1] (all capacities unformatted). A non-removable media variant family of 12, 24 and 48 MByte capacity, the MMD, was then announced in 1976[1]. This family's interface, SMD, derived from the earlier Digital RP0x interface and became a standard in the late 1970s.
The SMD interface was based upon a definition of two flat interface cables ("A" control and "B" data) which ran from the disk drive to a controller and then to a computer. This interface allowed data to be transferred at 9.6 Megabits/sec. The SMD interface was supported by most 8 inch and 14 inch removable and non-removable disk drives. It was mainly implemented on disk drives used with mainframes and minicomputers and was later itself replaced by SCSI.
Control Data shipped its 100,000th SMD drive in July 1991[2]. By 1983 at least 25 manufacturers had supplied SMD drives[3], including, Ampex, Century Data Systems, CDC, Fujitsu, Hitachi, Micropolis, Pertec, Priam and Toshiba.
[edit] See also
[edit] References
- ^ a b c d Control Data Corporation Newsletter, Summer 1977 Edition, p. 6
- ^ Magnetic Peripherals Corp. Magazine, August 10, 1981
- ^ 1984 Disk/Trend Report
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