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Definition of File shredder
1. Noun. (computing) A software program designed to overwrite the contents of a data file to prevent recovery of the file contents. In addition, File Shredder software may also be used to overwrite the unused sections of a hard drive (freespace) to erase previously deleted files. The number of overwrites as well as the pattern of data used in the overwrite function vary from program to program. ¹
¹ Source: wiktionary.com