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hey there!
i'm erasing a 200gb sata hdd atm by using this cmd
dd if=/dev/zero of=/dev/sda bs=64k
how long will that procedure take? is this bs= setting speedier than without? and if it'll take too long, can i abort it?
thx in advance! :-)
cheers,
deTTo
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I use this with bs=1M, but I don't know the time
Have you tried to turn it off and on again?
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it just finished i GUESS
dd: /dev/sda: No space left on device.
that SEEMS correct, but is it? about 1 hour has passed.
thx 4 the quick response & in advance ;-D
cheers,
deTTo
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man shred
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If you want to have a _clean_ hard disk so that no one can restore the data, you have to use special programs or overwrite your disk several times.
200GB / 1h = 204800MB / 3600s = 56.9 MB/s
Yes, that SEEMS (:D) realistic
hightower
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Why do you need special programs?
Have you tried to turn it off and on again?
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Because the 1 or 0 information of one bit is stored in multiple (hundreds) of physical units. If you overwrite once only the majority of this units is set to the new state. So it is possible to recover the former state by analysing the unchanged units. In order to change these units, too, you have to overwrite again and again (I don't know how many times are sufficient).
The term "special" is misleading - these programs simply overwrite multiple times by default.
hightower
Last edited by hightower (2007-02-13 19:32:36)
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How about
for i in `seq 1 10`; do
dd if=/dev/zero of=/dev/sda bs=1M
dd if=/dev/urandom of=/dev/sda bs=1M
done
That should wipe it fairly nicely. It would take around 20 hours or more though, and some data will still be there, you can never really wipe the disk clean
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