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Way long ago, before Y2K, a frequent defrag on all our PCs was highly recommended and established as a routine in our office.
Except for one set of machines....
Deep on a dark winters night, during the quiet spell between midnight and 2am I defragged the office ssystem, and also this set of machines....(it was late, I was tired, the weather was lousy).
What I forgot was that the software running on them was supplied by an outside agent who, for reasons they understood, placed their software password into the file structure such that a defrag would remove it; thus at 3am the program no longer operated....
Luckily (!) for me, their support was first class and I was able to get up and running again, before the PCs were needed at 3.30 am, but it was frantic for a while....
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