Sorry to hear that.Hope I can bring you some useful information,since I have the same experience of it,however,I have solved it.
The disk error problem may occur if some corrupted files are stored in the player or if the USB connection is disrupted while data is still being transferred. Please try to format the player follow the step as below:
1. Please copy all the folders to your pc.
2. Please format the FAT file on the player itself.
3. After format it on the player, please copy all your folders to your player and notice that each folder should be on the original address.
If you still can't make it,you can refer to this site for details: http://www.sourcingmap.com/faq.php?category=Product%20Trouble-Shooting,I think there information are very useful.I also solve my disk error problem by following there instruction.The above points are my personal opinions.
Emily, July 2007