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Occasionally one has duplicate copies of a logically identical media.  However, at time each copy has different failures.

The merge disk images allows two disk images to be merged.  The routine will analyse the master file, and if a blank sector is found, it will then test the second file.  If the second file has a non blank sector, this will be merged into the master file.

There are occasions where one wants to merge a partial file with a full file.  If for instance, as in the example shown above, there is an image of just the start of MFTs, this will be merged into the main file starting at sector 0x60003f.  It is not possible to merge a file that starts after the end of the master file.