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    Bah, jofel beat me to it. Still leaving though as the answer is slightly different. Also invoking pv in the method I provided lets pv give you progress of how much is left (including time estimates), instead of just how much has transferred so far. Commented Mar 15, 2012 at 19:32
  • why ibs=1M and obs=1M? Commented Mar 16, 2012 at 1:26
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    Larger block sizes (over the default for dd) improve IO to/from physical volumes. While the the value jofel gave (64k) is probably fine, memory is cheap and I usually just set it at 1m. Commented Mar 16, 2012 at 8:29
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    @jofel piping to /dev/null is not a valid test. Its size of the blocks to/from the physical volume that matters. Commented Mar 16, 2012 at 9:32
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    +1 because of using dd's default stdin instead of cat. Much better. Commented Mar 16, 2012 at 20:44