Just going on what Steve said as I am not a software guy.
I only have a Linux boot disk, and tried to look at the drive that I formatted on the external port, but couldn't read anything.
You don't need to read it; just run : fdisk -l.
It will give you partitioning of all your drives. The letter is L in lower case.
Edited by P Smith, 11 May 2012 - 10:40 PM.