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As tezcatl says scrub and dd are good choices. If you're wiping a whole disk make sure to change the bs=BYTES option (see `man dd') and experiment a little (depends on the HDD), as this can speed the process up e.g.

dd bs=8M if=/dev/zero of=/dev/hdd

There is also no need to overwrite something more than once [1].

[1][http://https://en.wikipedia.org/wiki/Gutmann_method#Criticism](http://https://en.wikipedia.org/wiki/Gutmann_method#Criticism)

As tezcatl says scrub and dd are good choices. If you're wiping a whole disk make sure to change the bs=BYTES option (see `man dd') and experiment a little (depends on the HDD), as this can speed the process up e.g.

dd bs=8M if=/dev/zero of=/dev/hdd

There is also no need to overwrite something more than once [1].

[1][http://https://en.wikipedia.org/wiki/Gutmann_method#Criticism](http://https://en.wikipedia.org/wiki/Gutmann_method#Criticism)[1][https://en.wikipedia.org/wiki/Gutmann_method#Criticism](https://en.wikipedia.org/wiki/Gutmann_method#Criticism)

As tezcatl says scrub and dd are good choices. If you're wiping a whole disk make sure to change the bs=BYTES option (see `man dd') and experiment a little (depends on the HDD), as this can speed the process up e.g.

dd bs=8M if=/dev/zero of=/dev/hdd

There is also no need to overwrite something more than once [1].

[1][https://en.wikipedia.org/wiki/Gutmann_method#Criticism](https://en.wikipedia.org/wiki/Gutmann_method#Criticism)

As tezcatl says scrub and dd are good choices. If you're wiping a whole disk make sure to change the bs=BYTES option (see `man dd') and experiment a little (depends on the HDD), as this can speed the process up e.g.

dd bs=8M if=/dev/zero of=/dev/hdd

There is also no need to overwrite something more than once [1].

[1][https://en.wikipedia.org/wiki/Gutmann_method#Criticism](https://en.wikipedia.org/wiki/Gutmann_method#Criticism)