I had similar problems e.g. Boot Error, permanent Checking Disk and folders that were inaccessible in Windows.
To cure these I did the following:
1. Removed battery
2. Connected player to Windows XP machine
3. Started command prompt
4. Entered chkdsk D: /f (replace D: with the drive letter that your drive connects as)
5. Answered "N" to lost chains as files question
6. Removed drive using the "Safely remove hardware option"
7. Replaced battery and powered on drive
8. Selected the following option:
Set --> Format Drive --> OK
9. After formatting, the player restarts
10. Shut down player
11. Removed battery
12. Connected to PC and added music
13. Everything was OK
The problems seem to occur because the battery flattens whilst starting up or it switches itself on as it is removed from the PC - that’s why I remove the battery before connecting.
Hope this helps you as well.
Phill Wade
August 2007