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Erase free disk space from the command line
Authored by: FreeBSD4Me on Apr 09, '10 03:09:41PM
Just use the diskutil. Open terminal, type df and hit enter.
Get the name of your disk (probably /dev/disk0s2) and type the diskutil command to erase free space which is:
diskutil secureErase freespace 1 /dev/disk0s2
That will erase your free space with random numbers. See the list of options below:
Level should be one of the following: 0 - Single-pass zeros.
1 - Single-pass random numbers.
2 - US DoD 7-pass secure erase.
3 - Gutmann algorithm 35-pass secure erase.
4 - US DoE 3-pass secure erase.

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