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Wasn't that IBM PC circa 1980 or 1981? =======

First 8 inch rigid disk drive - 979 IBM 62PC "Piccolo" - 64.5 Megabytes, six 8" disks

First 5.25 inch rigid disk drive - 1980 Seagate Technology ST506 - 5 Megabytes, four 5.25" disks

First 3.5 inch rigid disk drive - 1983 Rodime RO 352 - 10 Megabytes, two 3.5" disks

First 2.5 inch disk drive - 1988 PrairieTek 220 - 20 Megabytes, two 2.5" disks

source: http://www.disktrend.com/5decades2.htm

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