Hello,
I have had a few MP4 players now, and found that with some of them, the disks can become corrupt and no longer writable. The drive in this state seems to need formatting, but a straight format wipes out required files on the device. To prevent this, try making a backup raw drive image. Using linux you can do this with the dd command:
Code:
dd if=/dev/sde1 of=~/mp4.backup.img
Here change sde1 to the drive of your mp4 disk. I guess you can use rawwrite for this if using windows. To replace the disk image just use
Code:
dd of=/dev/sde1 if=~/mp4.backup.img
This works but does require you make the disk image before you screw up the drive. I have recovered a few times using this, and on different players too. Not tried to recover from images of differing drives yet though.
Neil