I got an mp3 player, but the software it have says that there's no files but when I plug it the files are there!, so I tough that maybe the partition had got corrupted in some way so I decided to format it, I tryed with mkfs.vfat and it didn't report any error but the files are still there!, well then I tryed deleting them with rm, it remove the files but when I pluged it again the files were still there, and then, both, fdisk an parted output unrecognised disk label. Does anyone know how to format it? and maybe it'll fixed the no files error on the player.

usb 2-2: new full speed USB device using uhci_hcd and address 2
usb 2-2: configuration #1 chosen from 1 choice
SCSI subsystem initialized
Initializing USB Mass Storage driver...
scsi0 : SCSI emulation for USB Mass Storage devices
usbcore: registered new interface driver usb-storage
USB Mass Storage support registered.
usb-storage: device found at 2
usb-storage: waiting for device to settle before scanning
If you need more info just tell me and I'll post it, thanks.