"wipe is a little command for securely erasing files from
magnetic media. It compiles under various unix platforms, including
Linux 2.*, (Open+Net+Free)BSD, aix 4.1, SunOS 5.5.1, Solaris 2.6.
Recovery of supposedly erased data from magnetic media is easier
than what many people would like to believe. A technique called
Magnetic Force Microscopy (MFM) allows any moderately funded
opponent to recover the last two or three layers of data written to
disk. Wipe repeatedly writes special patterns to the files to be
destroyed, using the fsync() call and/or the O_SYNC bit to force
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