Digital cameras are great, and so are memory chips, but sometimes failures happen and photos are lost. The typical reason is that part of thye chip is corrupted when taking it out of the camera, or plugging into the PC. Data recovery is fairly straight forward, and many recovery programs will produce good results. The problem comes when some of the photos will not open or are otherwise corrupted.
When a memory chip is corrupted, it is very common for the file allocation table (FAT) to be destroyed which means that the normal recovery program can only assume that the photo was stored sequentially, and again many times this is the case. If you are a photographer that has deleted some photo in the camera, either because they were bad, or to save space then new photos will be fragmentd when stored. This means that different parts of the photo will be stored in different areas of the memory chip. The location of each sector (or cluster) used is stored in the FAT, and this is the critical element which may be missing. Hence photos are not recovered correctly.
The solution is a feature rarely found in recovery software that will examine all the memory chip and reconstruct photos even when the fragments have been scattered over the memory chip. Although it may not be possible to be 100% reliable, extra photos will be recovered that otherwise would be lost. For more details see www.cnwrecovery.com/html/jpeg_frags.html
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