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In Header-footer carving, a recovery program attempts to recover photos based on the standard starting and ending byte signature of the photo format. 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.

You can upload your recovered files directly to Google Drive, Dropbox, or send them via email. On a non-rooted device, the app can only recover lower-resolution versions of your photos that it finds in your device's cache and thumbnail directories. To be able to search for other types of files, and to search your device's entire internal memory, the device needs to be rooted. Note: if your device is not rooted, the app can only perform a "limited" scan for for deleted photos. Whether you accidentally deleted a file, or even reformatted your memory card, DiskDigger's powerful data recovery features can find your lost files and let you restore them. DiskDigger Pro (for rooted devices!) can undelete and recover lost photos, documents, videos, music, and more from your memory card or internal memory (see supported file types below).