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magicrescue - Scans a block device and extracts known file types by looking at magic bytes.
Behind the Scenes
Scalpel is a fast file carver that reads a database of header and footer definitions and extracts matching files or data fragments from a set of image files or raw device files. Scalpel is filesystem-independent and will carve files from FATx, NTFS, ext2/3, HFS+, or raw partitions.