To format your player under linux.
Go to the terminal:
mkfs.vfat -F 16 /dev/sdX1 (replacing X with your USB key drive letter)
That's it, you should now have a restored USB key with a single fat 16 partition that can be read from any computer.
If your player works with FAT32, do:
mkfs.vfat -F 32 /dev/sdX1 (replacing X with your USB key drive letter)
If you had a encrypted partition also on this player, you maybe have to follow the steps shown in the next link.http://www.pendrivelinux.com/2007/07/19 ... partition/
Choosing to format my player with Gparted, choosing fat16 didn't work for me.
(I could use the player as usb stick, but the player couldn't play any music. The size of the fat16 partition made by Gparted was 980MB, while after formatting with mkfs.vfat is was 1011MB)