Hi. I've a problem whit my Pioneer-deh p5100ub and that is the front usb. I had tryed before a usb in it and it did work, and I was thinking for to get more music on it and I did that, but then when I was putting it back it only says "Format read" all the time... So I was putting back the songs I had before in the usb but it's still the same... So can you please help me what the problem is? ps. sorry for my english