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I use cat /dev/zero to write on free space on Each drive one by one but my question should I use;

cat /dev/zero > wipe_space or cat /dev/urandom > wipe_space

2.I know that first write zero and the second write random data, but zeros is much faster, so whats the difference?

3.and Is there any difference between cat , dd command?

4.last question is this way secure just dont want the one who will get my pc restore any thing with recovery tools.

Note:I'll not erase every thing, 'll delete personal stuff and wipe free space!

illsecure
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1 Answers1

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  1. I would imagine /dev/zero would be quicker. You could test by using the test command in the terminal.

  2. Advanced recovery tools can analyse the residual magnetic fields left on the disk blocks in order to recover data that has been overwritten. The safest way completely destroy data is to write random data to the disk multiple times (this all assumes you are using a magnetic disk, and not an SSD).

Kevin
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