ive read about the flash drives working ont he F900Bt does this mean you can take a portable hard drive and load music on it and play it threw the usb on the F900BT or can you upload it into the F900BT i dont know much about this im a Z series person and mine just went out so i was looking at options. i miss my HDD Though

You can put music on flash drives or SD cards

There are reports in the HACKS forum where people have used USB hard drives, however, they have to be powered seperately as the USB on the Avic-Fs is not powered. USB thumb drives and SD cards require no such malarky.