I use the vastly used WD Elements 2TB HDDs, they are topsellers on Amazon and I think people on this forum say they work, no?
The 2 Y cables are quite short, the way I do it is:
- vWii HDD datacable into slot0 (back upper)
- vWii HDD powercable into slot1 (back lower)
- WiiU HDD datacable into...