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Remy Blank wrote: |
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>Mark Knecht wrote: |
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> |
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> |
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>> Sold my laptop on Ebay. It was dual boot Gentoo/XP Pro and had |
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>>financial data on it. I'd like to pretty securely wipe the drive |
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>>before shipping. I've already deleted all 10 partitions and written |
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>>new partitions on which are different sizes and different file |
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>>systems. What simple command can Ido to write data to the whole drive? |
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>> |
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>> |
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> |
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>Assuming your hard disk is /dev/hda, I'd do: |
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> |
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> dd if=/dev/zero of=/dev/hda bs=8M |
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> |
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>Then go have a coffee. If you want it more secure, go for this, a few |
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>times in a row (at least 7, I read): |
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> |
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> dd if=/dev/urandom of=/dev/hda bs=8M |
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> |
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>However, this will take a *long* time, as /dev/urandom is quite slow. |
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>But it will make the data unrecoverable even with expensive means. |
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> |
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> |
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A good option for more speed would be to use aespipe to encrypt |
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/dev/zero and write that output to the disk. Since AES encryption |
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generates essentially random data, this should be the equivalent of |
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reading from urandom, only much much faster. You still have to run it |
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multiple times of course, and with a different encryption key each time, |
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but commands like this should do the trick: |
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head -c 45 /dev/urandom | uuencode -m - | head -n 2 | tail -n 1 > key.txt |
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dd if=/dev/zero bs=64k | aespipe -p3 -e AES128 3<key.txt >/dev/hda |
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-Richard |
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-- |
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