Am 14. Dez, 2014 schwätzte Matt Graham so:

moin moin Matt,

yeah, using /dev/urandom will probably go much, much quicker than using
/dev/random :).

Here's an interesting read on the subject:

http://www.2uo.de/myths-about-urandom/

ciao,

der.hans

> On 2014-12-14 11:00, Todd Millecam wrote:
>> $~  for i in `seq 10` ; do dd if=/dev/random of=/dev/sda && dd
>> if=/dev/zero of=/dev/sda ; done
>
> This will work, but it will take days.  /dev/random is a super-high-quality 
> random device, and it will run out of super-high-quality random bits very 
> quickly and wait for multiple seconds to generate more from various entropy 
> sources.  You probably want to do this instead:
>
> for i in `seq 10` ; do
>  dd if=/dev/urandom of=/dev/sdX bs=32k
>  dd if=/dev/zero of=/dev/sdX bs=32k
>  done
>
> /dev/urandom is much much faster, though its randomness is not as guaranteed. 
> Using a bs= on the dd command is also a good idea as it defaults to a bs of 
> 512 bytes.
>
>> Dban or wipe will do all this for you, but you can do it yourself.
>
> Yes.  And if you do it yourself from a shell, you know exactly what's going 
> on and can use the computer for other stuff while you're erasing whichever 
> disk you wanted to erase....
>
>

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