Actually, the H/U I installed came with the 3.0 firmware installed already. I never tried to use the SD card until recently, and only used the USB port for the Ipod. When I inserted the SD card I was trying to view a few jpeg pictures. I didn't reformat it to fat32, either way, it's not illuminated as an option on the source screed. The same is with the USB port. I know it works because the Ipod works fine, and I've read the thread on the 2.5v for the external hardrive.
Not to sure, and I'm sure you all will agree, if it makes any sense to make the modifications for the external hardrive i