you can use the same hdd as the wii. there's nothing else required. the vWii must be hacked though. I use the same hdd on my vWii along with a switcher to switch to my normal wii if need be. hacking the vWii isn't really that time consuming actually. it might take 10 minutes or less. more than that if you backup the NAND (really slow) and each IOS (I'd recommend doing both).