$ time dd slackware-13.0-install-d2.iso conv=swab of=tmp/delete.me
1315400+0 records in
1315400+0 records out
673484800 bytes (673 MB) copied, 4.05028 s, 166 MB/s

real    0m4.173s
user    0m0.640s
sys     0m3.370s

$