I recently bought a new mp4 player form china, and it all worked fine. I could perfectly copy and paste mp3 and amv files onto the removable drive, until one day i decided to create files therough windows explorer on my mp4 player to categorize my songs and as soon as i took it out i turned it on and went to the music section and... No Files/Disk! i tried going on the video section but .. No Files/Disk! then i plugged ack into windows but when i opened removable drive it showed no files again!!! everything is gone and i cant put anything on it again aswell. Plz HELP