I would suggest going to the site for the MP3 player manufacturer and downloading the latest drivers. I had issues with my Creative Nomad Jukebox a short while ago and I updated the player's firmware...

Just in case it's already partitioned as either NTFS or FAT, has data on it, and has no OS installed (i.e. it was a slave before and was used as, say, an MP3 database,) then i suggest you check to...