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bug#17149: shred - tape data
From: |
Pádraig Brady |
Subject: |
bug#17149: shred - tape data |
Date: |
Tue, 01 Apr 2014 13:38:27 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130110 Thunderbird/17.0.2 |
On 04/01/2014 01:18 PM, Rupert Russell wrote:
> Pádraig,
>
> This seems to be getting my task done.
>
> for i in $(seq 1 $NUMTAPES) ; do
> mtx -f $LOADER load $i
> for j in $(seq 1 $NUMWIPES); do
> shred -v -n 1 $TAPE
> mt -f $TAPE rewind
> done
> shred -v -z -n 0 $TAPE
> mt -f $TAPE rewind
> mtx -f $LOADER unload $i
> done
>
> By the way, is there a difference between what these two write to the media?
> mt -f $TAPE erase and
> shred -z -n 0 $TAPE
It depends I suppose.
`mt erase` might trigger a command to the hardware
to activate a degausser or something, rather than writing zeros,
though from a very quick google it defaults to writing zeros.
BTW I find this a handy way to see what shred is doing
rather than reading the docs:
strace -e write shred -s 1K /dev/null
thanks,
Pádraig.
- bug#17149: shred - tape data, (continued)
- bug#17149: shred - tape data, Rupert Russell, 2014/04/04
- bug#17149: shred - tape data, Pádraig Brady, 2014/04/04
- bug#17149: shred - tape data, Rupert Russell, 2014/04/04
- bug#17149: shred - tape data, Pádraig Brady, 2014/04/04
- bug#17149: shred - tape data, Rupert Russell, 2014/04/04
bug#17149: shred - tape data, Rupert Russell, 2014/04/02
bug#17149: shred - tape data, Rupert Russell, 2014/04/01
- bug#17149: shred - tape data,
Pádraig Brady <=