What's an enclosure? I know what a partition is, but I'm not sure.
An enclosure is for making an internal hard drive into an external usb hard drive
I brought it up, so I'll try to be a bit more descriptive. It's basically this little metal box that you stick any old hard drive into. Great way to repurpose an old harddrive that has outlived its usefulness for you in your main computer.
If you have an older drive (let's say, under 500 gb) then it's most likely and IDE drive (connector is about 2 inches wide). If you have a newer drive (1 tB or more) then it's most likely a SATA drive (connector is a tiny little red thing).
Enclosures tend to run between $20 to $40. Very easy to set up (literally, pop it open, stick in old hard drive, connector wire, close it up, you're ready to rock).
Here's the one I plan to use: You should also be warned that enclosures come in 2 general flavors, 2.5 and 3.5. 3.5 inchers tend to be for old, normal sized hard drives you'd find in your PC. They need to be plugged in with a separate AC adapter for power. 2.5 inchers are smaller harddrives for notebook computers. They don't need an external power source, as they come with those little y-shaped usb cables (1 for data, 1 for power). But according to Nintendo, these are not recommended for Wii U use.
As Louieturkey said, these SHOULD work. I just wonder if they really will, since these can used just about any hard drive you have lying around.