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On Fri, 13 May 2011 22:47:43 -0400, Andrey Moshbear wrote: |
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> > Is the bs=2M important? Should one use the block size of the drive? |
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> Speed improvement. |
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> If you're doing a backup of a rather large disk, I duggest piping to |
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> bzip2 or gzip. Unless the free space is random padding, even the |
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> slightest |
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> compression will be more efficient, space-wise, than the raw file. |
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You could also do |
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dd if=/dev/zero of=somefile bs=1G |
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rm somefile |
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to zero the unused blocks, which should both speed up and increase |
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compression of those areas. |
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-- |
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Neil Bothwick |
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Copper wire was invented by two Scotsmen fighting over a penny! |
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