I have looked all over my house and I can't find a 4gb memory stick. But i did find an 8gb SD Card. just wanted to know if Backtrack 4 would work off the SD card becaue i don't know if BIOS supports the option to boot from my SD card slot.
Help?

SD card in the BIOS may show up as a USB drive, depending on your method of connection for your card reader (assuming you have a desktop), if its a laptop, idk. either way, you might as well try it

If you can't run it directly from the built-in card reader, try a small dedicated USB adapter for SD cards.

Something like:

ah, cool thanks

just out of curiosity, did you try it yet? if so, what method did you use? and did it work?