I think non power supply harddrives need a y cable though. But they cost pittance.
A number of websites tested ones without power supply and they seemed to work fine
Regarding external HDDs, am I right in remembering to be compatable they need to be seperately powered as the WiiU's USB ports can provide enough juice?
Will be pretty annoying if neither of my existing WD 500gb drives are suitable.
Ultra - thanks for the impressions. The wait to hold out till rayman is getting harder! only a couple of months a way though , although i'm also have looking at getting a vita instead
PSN - Cloudsheaven