I am installing Linux (YDL) on my old Powerbook G4. Thinking only of speed, which would be faster to install it on: a [Lexar JumpDrive TwistTurn 32GB](http://www.lexar.com/products/lexar-jumpdrive-twistturn-usb-flash-drive) USB flash drive, or a DVD (a CD hasn't got enough memory.)? 

Does this even make any difference, with the speed of the hard drive?