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    Not answering your question, but your times are quite high IMO. Did you remember to pass a bigger block size to dd other than the default 512 bytes? dd ... bs=16M is my suggestion, given your RAM, disk size and speed. Commented Apr 13, 2011 at 20:29
  • I didn't, simply because I wanted to play it safe. I'll try that next time, though. Thanks. Commented Apr 14, 2011 at 1:26
  • In my experience, dd on Mac OS X has a tendency to freeze to the point where I can't even kill the process, but have to restart the system. I resort to doing work on a Linux VM then. Commented Jun 12, 2014 at 18:58
  • as pointed by @Juliano, a higher bs does make a huge difference in speed, by orders of magnitude Commented May 13, 2023 at 13:13