cracia

I'm facing a weird error on my NW-505 network walkman. It displays a "FORMAT ERROR" message as soon as i try using it. The device has songs transferred on it but none show on the device menu. Can somebody plz tell me what is wrong with it and how i can correct the problem? ROM. I have the same problem...please can anyone tell me what to do....my sonystage tells me to delete all files but it does not work .and it won't let me initialize either thank you