ok here is the real answer for your ????
there is a utility that most drive makers have to diagnose what is wrong with the drive you will need the code that it gives you when you run that little program when you call for the rma to return the drive
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My question is, is a bad block a mechanical failure warrenting replacing the drive
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yes if the drive does not show any damage due to abuse
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or a condition that can be remedied by reformatting or did chkdsk/f fix it good as new (except for the few files it couldn't recover) ?
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to your other part if one block has gone bad then others will fallow
so get it fixed it will work for a while but cant tell you how long