With Knoppix it is possible to boot off an iso image on the hard drive, just extract the kernel and ramimage, point bootloader to them and pass a cheatcode to kernel.

My question is if anyone has done this with BT4. the reason is because after a frustrating trouble shooting session with my dvd burner i went at it with an air can and now it doesn't burn dvd images... don't have 2G usb drive either.