argentina_72 :
It's really possible that the USB port in my car is not working when it charges my phone and play the music that I have in there?
Being able to charge from the usb port and the radio being able to read the files are two different things really
It certainly is odd that it can still read the files on your phone but doesn't want to know when it comes to the USB sticks...and that the 16gb is suddenly unreadable...
Not really sure what to suggest now, other than try reformatting the 16gb to how it was and just add a couple of tracks to it...
Did you have the files in folders on the usb's or just...on there if that makes sense?
Try without folders, and with...see if that makes any difference.