Problem with iRiver T30 MP3 player.

I was wondering if anybody could help me determine the cause of a read only
problem with my iRiver T30.

I have checked everything for a read only switch on the device, that I may
have knocked on, but found nothing.

The T30 mounts ok on Ubuntu Breezy Badger, but when I go to transfer files
to it, an error message appears saying that I do not have permissions to
write to the folder (/media/T30).

Any help greatly apprieciated :)
.