ytterbium:/home/otto# time (dd if=/dev/zero of=/tmp/testfile bs=1024000 count=10;sync;sync)
10+0 records in
10+0 records out
10240000 bytes (10 MB) copied, 0.02597 seconds, 394 MB/s

real    0m2.417s
user    0m0.000s
sys     0m0.024s