Today is the 50th anniversary of the IBM 305 RAMAC - listed at the link
below as the first computer system that had a disk drive.
http://www.cedmagic.com/history/ibm-305-ramac.html
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dave06a (at) Dave Dunfield
dunfield (dot) Firmware development services & tools:
www.dunfield.com
com Collector of vintage computing equipment:
http://www.classiccmp.org/dunfield/index.html