I have been using a USB flash drive for years on my Axiom Airs to play my music. I now have a Axiom Air Transformer connected to my home stereo, also playing music via the USB drive.

Recently, a Western Digital 500 GB MyBook external hard drive became available to me, and I would like to use it to play my music on the Transformer. It connects via USB also. Is this possible to use with the Transformer or can you only attach USB flash drives to it?