Apricorn SATA Wire - USB 2.0 Interface to any 2.5" SATA Drive - Manual (Page 37)

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Verification errors
When the option Verifying is activated, EZ Gig executes a verification run
after the copying process. A verification error is counted if the data of two
sectors on source and target do not correspond. Furthermore, read errors,
which occur during the verification run in one or both of the areas to be
compared, are also counted as verification errors. Therefore, the number
of verification errors gives you absolute information on how exactly source
and target correspond to each other after the copying process. In case of
an error-free copying process, EZ Gig should not report any verification
errors and signalize a 100% conformity of source and target.