I thought I would post some feedback on the external hdd i purchased in here as I could not find a dedicated thread.
Imation 320GB Apollo M100 USB3.0 Portable HDD (For the aussies - cost me $39AUD at Officeworks)
FEEDBACK:
Formatted quickly and works great. So far it appears to be running of the ONE usb cable (i.e. no need for Y cable).
One thing I noticed is that things run and install quicker on the external than on the flash memory. I have been playing MH3 and Rayman of the external and they run smooth.