You won't be able to use a pen drive for the SATA drivers, the Windows Installation will only look for them on a floppy drive, no floppy drive, it will not find the drivers, or even look for them anywhere else, although I suppose it's possible if your BIOS will emulate the pen drive as a floppy drive. You could also slipstream the drivers on to a windows CD, then you won't need a floppy.