Am 30.03.2013 12:58, schrieb M. Fioretti:
I will (re)study these topics in detail in the next days. My first
interest is to understand if those (or other) tools are enough to be
sure, without reformatting/reinstalling
reformat / reinstall does not anything in the direction of the topic
that, besides the files one DOES want to keep, there really is
nothing
else recoverable on the drive
dd if/dev/urandom of=random.bin bs=16M; sync; rm -f random.bin
creates a file with random-stuff until the disk is full, syncs
it really to the disk and removes the file as the same with
dd if=/dev/zero will zerofill free space to make it
possible shink thin provisioned virtual-disks as example