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+The zeroer utility can be used to wipe empty space on a disk. In contrary to dd,
+zeroer does not wipe existing files on a partition. It overwrites the
+unallocated disk space around existing files, which means that deleted files
+cannot be restored after processing a certain partition with zeroer.
+
+The utility's principle consists in writing huge zero-padded memory blocks to a
+file. To a certain extent this works similar to dd, however zeroer dynamically
+reduces the blockwriter's buffer size when the filesystem is going to be full.
+
+WWW: http://critical.ch/zeroer/