file carving
n.— «It is an example of a sophisticated technique called file carving—restoring the contents of a file after the identifying information that accompanies it has been removed or lost.» —“Sleuthing Software Can Reassemble Deleted Photos” by Anne Eisenberg New York Times Mar. 1, 2009. (source: Double-Tongued Dictionary)
Further reading
In 1916, a small-town newspaper in Pennsylvania printed a fanciful item about a local gathering with a guest list that included, among others, Miss Ella Vader, Mr. Ray Zor, and other punny names. This is part of a complete episode. Transcript of...
You don’t really need those little rivets on your blue jeans. Those flat metal disks are leftovers from an earlier time, when jeans had to be much more durable. Such decorative elements that no longer serve a practical purpose are called skeuomorphs...