Header-footer carving, along with header-size carving, are by far the most common techniques for photo recovery. Simson Garfinkel showed that on average, 16% of JPEGs are fragmented, which means on average 16% of JPEGs are recovered partially or appear corrupt when recovered using techniques that cannot handle fragmented photos. Most of these techniques fail in the presence of file system fragmentation. There are many different file carving techniques that are used to recover photos. The majority of photo recovery programs work by using a technique called file carving (data carving). Logical Damage or the inability to view photos can occur for several reasons. Photo loss or deletion failures may be due to both hardware or software failures/errors. Photo recovery can be considered a subset of the overall data recovery field. Photo recovery is the process of salvaging digital photographs from damaged, failed, corrupted, or inaccessible secondary storage media when it cannot be accessed normally.
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