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  1. Jeff L (baturkey@flumph.masto.host)'s status on Wednesday, 25-Sep-2019 10:39:11 EDT Jeff L Jeff L

    https://devblogs.microsoft.com/oldnewthing/20190924-00/?p=102915

    Mark Zbikowski led the MS-DOS 2.0 project, and he sat down with a stopwatch while Aaron Reynolds and Chris Peters tried to swap floppy disks on an IBM PC as fast as they could.

    They couldn’t do it under two seconds.

    So the MS-DOS cache validity was set to two seconds. If two disk accesses occurred within two seconds of each other, the second one would assume that the cached values were still good.

    In conversation Wednesday, 25-Sep-2019 10:39:11 EDT from flumph.masto.host permalink

    Attachments

    1. How did MS-DOS decide that two seconds was the amount of time to keep the floppy disk cache valid?
      By Raymond Chen from The Old New Thing
      How did MS-DOS decide that two seconds was the amount of time to keep the floppy disk cache valid?
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