$ sudo dd if=FreeBSD-8.1-RELEASE-i386-memstick.img of=/dev/sdc
1852040+0 records in
1852040+0 records out
948244480 bytes (948 MB) copied, 1142.68 s, 830 kB/s

$ sudo dd if=FreeBSD-8.1-RELEASE-i386-memstick.img of=/dev/sde
1852040+0 records in
1852040+0 records out
948244480 bytes (948 MB) copied, 410.677 s, 2.3 MB/s