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Message: <blockquote data-quote="MacInWin" data-source="post: 1761252">So, did you actually disconnect it improperly and forgot to tell us? That is a key thing to omit.If not, one of the first symptoms of failing drives is a slowdown in performance. The internal firmware on the drive itself does error checking for reads and writes, and if it starts to have to repeat the I/O operation multiple times before it succeeds, the drive slows down. But the OS (and thus, DU) doesn't see the errors because the drive eventually reports success at the operation. So DU thinks the drive is OK because eventually things work, but the overall performance is poor.  And eventually even the firmware cannot get past the errors and the drive fails totally.</blockquote>