DryHeave

I have used a 3TB External Drive single partition Fat32 on a RGH 360 and it reads it just fine, I used guiformat to format the drive, you can get it here http://fat32-format.en.softonic.com/ also if your drive is formatted already you can try and make the partition primary/active, I had the same issue at first where it wouldn't find the drive so that i could set the game paths. Also works for the 2TB that I am currently running.