Infoseepage #StopGazaGenocide@CliftonR @Steveg58 @cstross Not quite. They started as round magnetically coated read-only media that IBM could mail out to clients in a paper sleeve (inside other mailing packaging) to patch micro-code on mainframes. These early disks didn't have integral plastic sleeves for protection and they were only readable by the clients, not write-able. Only IBM had drive which could write to them at the time. They held about 80KB.
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