On Tue, Oct 27, 2009 at 11:12 AM, Jordi Espasa Clofent <[email protected]> wrote: > $ dd if=/deb/zero of=<disk_to_delete> > > ?Do you think is it safe enough? I mean ?is it enough against the common > recovery low-level data tools?
There is no evidence of over-written data *ever* being recovered. There is some theory in research papers that suggests it may be possible. There may be aliens and bigfoot and the NSA may be able to recover over-written data if you are of interest to them. OK, back to reality... the only suggestion I would make is to use arandom rather than urandom. You can cron that same command except output to a file rather than to the device to periodically overwrite the unallocated sectors. I do that. It kills a lot of the forensics tools that have the ability to recover deleted files, etc. Something like this on each partition: file=$$.random dd if=/dev/arandom of=$file sync rm -f $file sync Brad
