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 spa ce 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, but zeroer
dynamically reduces the blockwriter's buffer size
when the filesystem is going to be full.
