Making a bootable USB BT3 from the live CD

Backtrack 3 (http://www.remote-exploit.org/backtrack.html) has a download for a USB device, but i was able to create a bootable USB thumb drive from the live CD itself:

umount /dev/sda1
mkfs.vfat /dev/sda1
mount /dev/sda1
mount /dev/hdc /mnt/cd
cp -r /mnt/cd/* /mnt/sda1
cd /mnt/sda1/boot
./bootinst.sh

The thumb drive then worked; it is slower than the live CD, but one can save files etc. to it.