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How do you create a exact replica image of a corrupted disk?

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A client of mine had a disk which was wrongly reformatted and lost all the data. Now I have the disk and I need to make an exact image of the disk and run a recovery utility on it, ie TestDisk, PhotoRec and the like.

What are the options True Image needs to make an exact bit image copy of the disk and mount it so that I can run the recovery utilities on it? ie create a mountable TrueImage that can be made to appear to TestDisk or Photorec like the actual hard disk?

Will it be better to get the exact same size or bigger disk and do the Clone disk approach?

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You would need to use sector-by-sector mode and include unallocated space.

I'm not sure if the recovery programs would detect the Mounted image as a "real" drive and allow you to work with it. You may need to restore to a physical drive (or virtual drive if working in a VM).

The backup will probably be very large. A restore would require as much space as the size of the original drive.