I have completed a chkdsk surface scan of both HDs. I used the Windows GUI under Computer -> Properties -> Tools -> Error Checking, with the "Scan for and attept recovery of bad sectors" box checked. To my amazement, checking C: took only a few minutes, apparently because it executes during the early stages of a boot and has the undivided atttention of the machine. If this turns out to be an 8-bit utility that sees only 63 MB of a 2 TB HD or some such, I can use a boot DVD and the command line.
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