This method of getting a live install to a USB drive is the simplest available using Unetbootin. Note that we will format the USB drive and erase its contents.
1. Plug in your USB Drive (Minimum USB Drive capacity 2 GB)
2. Format the USB drive to FAT32
4. Start Unetbootin and select diskimage (use the backtrack-final ISO)
5. Select your USB drive and click “OK” for creating a bootable BackTrack USB drive
6. Log into BackTrack with the default username and password root / toor.