How to electronically eradicate, expunge, extirpate, obliterate digital data
Partitions
All data on drive X may be permanently destroyed by using the following command (warning - this may take a very long time):dd if=/dev/zero of=/dev/sdX
Confirmation of whether or not any non-zero bytes exist:
dd if=/dev/sdX | hexdump -C | grep [^00]
http://www.murga-linux.com/puppy/viewtopic.php?t=65509
Single files
Single files may be made permanently inaccessible by encrypting them before deleting them in the usual way.How to physically eradicate, expunge, extirpate, obliterate digital data
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