It's easy enough to accidentally delete cherished digital photographs. One wrong click of a button can wipe them out. Retrieving those images can be tricky, particularly when the files have been fragmented and bits of them are scattered throughout the hard drive or camera card.

Now, new software is smart enough to find and reassemble fragmented digital photographs, even when the directions for locating them have been deleted. The feat is similar to assembling a million pieces of a jigsaw puzzle with no guiding box-top image.

At the NY Times.

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