Ok, thanks, i'll give this a go and let you know EDIT: Ok, i copied everything to my PC, and formated, then created the OMGAUDIO folder and the .dat file again. It is now recognising my player in winamp with the 18. gb. I am now copying all the GYM files back on, and hopefully it should work again. But i am a little cautious. I don't want to get say 2000 songs on there and then one file that it can't read causes the win32 error meaning i would have to format again I'm going to put one album on at a time to be a bit safer and if it DOES happen again, i'll let you know. and it should be a bit more narrowed down EDIT 2: I copied all the GYM files back, but the tracks are still unreadable. does this mean i am going to have to go through the whole GYM coding again? EDIT 3: After a full new keycoding session, (ehich didn't work first time) and some reformating and copying later... I finally got music on to my player that played. I am using MP3FM this time, which may be the reason I'm not quite sure, but i will stick to it, an album at a time. Thanks for your help