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In some cases, Photo Rec can learn the original file size from the file header, so the recovered file is truncated to the correct size. In this case, Photo Rec parses the recovered data, then stops the recovery when the stream ends.If, however, the recovered file ends up being smaller than its header specifies, it is discarded. When a file is recovered successfully, Photo Rec checks the previous data blocks to see if a file signature was found but the file wasn't able to be successfully recovered (that is, the file was too small), and it tries again.If there is no data fragmentation, which is often the case, it can recover the whole file.Photo Rec recognizes and recovers numerous file formats including ZIP, Office, PDF, HTML, JPEG and various graphics file formats.Once this block size is known, Photo Rec reads the media block by block (or cluster by cluster).
To recover these lost files, Photo Rec first tries to find the data block (or cluster) size.The cluster or block size remains at a constant number of sectors after being initialized during the formatting of the file system.In general, most operating systems try to store the data in a contiguous way so as to minimize data fragmentation.Photo Rec ignores the file system and goes after the underlying data, so it will still work even if your media's file system has been severely damaged or reformatted.Photo Rec is free - this open source multi-platform application is distributed under GNU General Public License (GPLV v2 ).