I plan on buying the Pioneer AVIC-F900BT. I want a touchscreen navigation system with usb and plays dvd-rw/divx. either to replace the stock headunit or to put it up top in the cubby. The question I have though is with USB hard drives i heard theres a max of how many GB will work and that it depends on the HU you choose, is this true and does anyone know about the HU i plan on buying, also any suggestions for something similar.

 

also when you plug in a USB hdd is there lag time on the HU indexing and searching your HDD for music?