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Message: <blockquote data-quote="Slydude" data-source="post: 1791679" data-attributes="member: 131855">I'm trying to find the specific reference for this but I think there might be something relevant here. I think I remember reading several years ago that different disk utilities don't always test a drive in exactly the same way. IIRC one of the differences is in the number of times a utility will attempt to write to a block of the drive before reporting an error. Some programs tried as many as 20 times. If any of those attempts worked no error was reported. Other utilities were much stricter and reported errors after only a few attempts. I'm not sure where the thresholds are set for Time Machine and Finder but they could be very different. In theory, this could result in one program reading a file and the other failing to do so.</blockquote>