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I have a spare 500GB WD harddrive hooked up to my Wii U, and use it for all of my save files plus Mario U and Nintendo Land (so far). I have not tried to install my disk games on the HDD, because I don't remember reading anywhere that it was possible to do so. At the very least, there is no obvious message that pops up asking if you would like to install a disk game.

This particular HDD powers on and off with the Wii U. (It has an external power supply, and I leave the HDD power switch set to ON.) It also appears to go into a "sleep mode" if it hasn't been accessed for awhile. Then, when I do start up Mario U (for example), it takes a few moments for the HDD to spin up and access the disk, so there is a bit of a delay, but only a few seconds.

I don't have Mario U on disk to compare any of the differences you asked about, but once the HDD is accessed and the start screen comes up, the game runs flawlessly.



ramuji
www.ramuji.com
Nintendo Network ID: ramuji
Wii Friend Code: 8543-1141-9403-8457
3DS Friend Code: 1633-4130-0140
PS3 ID: ramuji_69