I've seen several mentions of "dd" in this thread, and I'll say that I've
seen several recommendations elsewhere to use a simple:

        dd if=/dev/<device> of=/dev/<device>

forgot bs=1m or at least 64kB, unless you like to wait days with default bs=512


to "refresh" the drive.  That is, dd will read the block(s), then attempt to
write them back, and if there are problems, the drive should re-map the sector


add conv=noerror,osync
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