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On Sunday 22 Jul 2012 18:45:50 Alex Schuster wrote: |
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> Jarry writes: |
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> > I want to backup my whole hard-drive (8 partitions) with: |
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> > # dd if=/dev/sda | gzip > /path/image.gz |
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> > |
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> > In order to achieve good compression level I'd like to wipe |
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> > out all empty space with zeros. How can I do that? |
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> |
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> You can create files containing only zeros on all partitions until |
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> they are full. Like this: |
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> |
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> for i in 5 6 7 8 9 10 11 12 |
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> do |
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> mount /dev/sda$i /mnt |
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> dd if=/dev/zero of=/mnt/zero |
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> rm /mnt/zero |
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> umount /mnt |
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> done |
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> |
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> Wonko |
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|
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Only to add that using bs=4096 or bs=2048 would help this take less than a |
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week waiting for it to finish. :-) |
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-- |
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Regards, |
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Mick |
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