Kapil Hari Paranjape wrote:
Hello,
On Wed, 01 Oct 2008, rajasekhar kuppa wrote:
This is a question i had for a long time.. with out a solution... how will
shred work on a disk subsystem? Does any body have experience with this .. i
mean on a disk array like Clarion or HP MSA .. these arrays usually do
not repeat the command in its intended purpose.. how do we successfully
use "shred"
on them??
For such systems one approach is to create an encrypted block device
which uses this device as the base block device. You don't even need
to remember the passphrase!
After creating the encrypted device. say /dev/mapper/encrypt you
can run
dd if=/dev/zero of=/dev/mapper/encrypt
Like shred, you can run this command multiple number of times to
ensure that all magnetic memory is also erased.
In US, for some kinds of "shred"ing, you are supposed to overwrite it
with random bit patterns before overwriting with delete. I do not know
the exact physics of it.. but it looks like data forensics is getting a
lot advanced and simple overwriting by zeros is just not enough for all.
Vaidhy
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