P.S. After checking a bit more, it seems that disk0s3 is the recovery disk partition (hidden). I suspect that this message does not involve SuperDuper, but it did get reported through SuperDuper's log, and I've never seen that message anywhere else. Maybe every so often the recovery partition gets quickly mounted and then unmounted as some kind of check by the operating system?
Last edited by sdsl; 08-15-2015 at 02:03 AM.
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