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Historical Computers in Japan

Peripheral Equipment

Magnetic Disk Units

  • Timeline
  • Brief History
  • Exhibits
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YearMonthJapan
1963   Fujitsu completed the FACOM 856, the company’s first magnetic disk unit.
1964   Fujitsu completed the FACOM 461 disk pack unit to create an interchangeable mediaby placing six 14-inch disks in the pack.
1965   Fujitsu completed the FACOM 631 magnetic disk unit using 41 disks with a diameter of 66 cm.
1965   NEC completed the NEAC-32 large magnetic disk unit to provide a 270million bit memory capacity for the FONTAC.
1966 08 NEC announced the E261, the company’s first 14-inch magnetic disk pack unit.
1967 06 Hitachi completed the H-8564, the first large magnetic disk unit produced byJapanese manufacturer.
1968 06 Fujitsu completed the FACOM 463 removable disk file unit, using 14-inch diskfor a cartridge.
1968   Mitsubishi Electric announced the M-811 small, fixed head disk unit for office computers and minicomputers.
1969 07 Mitsubishi Electric announced the M-834 removable disk pack drive unit that employed an electric magnetic-head positioning mechanism.
1970 03 Fujitsu completed the FACOM 472K, the company’s first cluster disk pack unit.
1970 05 Hitachi completed the H-8577 cluster disk drive unit for mainframe critical tasks.
1971 10 NEC annouced the N276 magnetic disk pack unit supporting 100 MB media.
1972 05 Mitsubishi Electric annouced the M-801 cartridge disk drive unit for small computerswith the fastest magnetic head positioning performance in the Japaneseproducts on that time.
1973 06 Hitachi completed the H-8589-1 magnetic disk drive unit that employed the renovated magnetic head positioning method using VCM drive servo control.
1973 10 Mitsubishi Electric annouced the M836 high capacity removable magnetic disk unit.
1973   NTT completed at 100 MB/spindle magnetic disk.
1973   Fujitsu completed the FACOM 477A cluster disk pack unit, which is equipped with a command retry function and an ECC function.
1975 06 Hitachi completed the H-8589-11 magnetic disk drive unit, which doubled the trackdensity.
1976 04 NEC annouced the N7751 14-inch fixed disk unit with a capacity of635 MB.
1976 05 Mitsubishi Electric completed the M2850 removable magnetic disk unit with medium capacity using high-density writing and reading technology.
1977 06 Toshiba started the shipping of the MK-100F/MK-300F Series of 14-inch fixed magneticdisk units.
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