Just as a data point in copying speed, I copied a 1TB disk twice on a
Mac Pro with the disks internal to the case.
With -c 128 and block devices (/dev/disk), transfer speed was 37MB/sec.
With -c 256 and raw devices (/dev/rdisk), transfer speed was 110MB/sec.
So definitely worth it to cut copy time. If using external disks,
there may not be such a difference.
Thanks
David
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