Scrub free disk blocks

kalinix calin.kalinix.cosma at
Sun Aug 29 19:33:07 UTC 2010

On Sun, 2010-08-29 at 20:21 +0100, Marko Vojinovic wrote:

> So if you want to be on a safe side, fill up the whole disk from /dev/random 
> over and over 20 times, and the original data will be completely gone. Even 
> for NSA & friends. :-)
> Best, :-)
> Marko

Actually, the 'standard' safe side is 25 times. And besides /dev/random,
you have 'shred' command, which can do the same:

from shred man:

Overwrite the specified FILE(s) repeatedly, in order to make it harder
for even very expensive hardware probing to recover the data.



Key fingerprint = 37B8 0DA5 9B2A 8554 FB2B 4145 5DC1 15DD A3EF E857

You will experience a strong urge to do good; but it will pass.

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