[Bug-ddrescue] Verify recovered data

[matt456]

I am trying to recover a USB flash drive that returns different data each
time it is read. There are no errors, so ddrescue does not retry at any
point during the imaging process.

It would be very useful if ddrescue could have an option to re-read data and
verify that is it same as what it read before. If it was not the same, it
could try the same block a number of times and choose the most likely
outcome.

Does anybody know of a way of taking a number of ddrescue images and merging
them to get a result with the least errors possible? For example, if there
were three images, and at a given point in the image there was a 0 in one of
the files but a 1 in two of the others, then it would choose the 1.

ddrescue has been a very useful tool. Thank you for taking the time to make
it!

Matt.
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