Hi,
Have got a Host USB2.0 40Gb HD, which can be used to Back-up Directly from Camera's and Other USB devices that are considered "USB Mass Storage Devices" without the need of a Computer (for instance, you can Backup your camera images onto this HD without the need for a PC), it's called a CUTIE OTG (On-The-Go) and be seen here
http://www.vtec.co.uk/product/643_668.asp. It says that you can also Back-up your PDA, the Question is, can you use the Drive with a PDA as a normal Hard Drive and therefore play music off of it etc??
Many thanks in Advance.