There's something immediately striking about Nintendo's Wii U proprietary disc format that's hard to notice in photos -- it's got rounded edges, both outside and in.

ENGADGET: Take a very, very close look at the round-edged Wii U proprietary discs

Wal-Mart's Neighborhood Market Stores come closest to that format, but with an average floor space of 42, 000 square feet, they will still be much larger than Tesco's Express format in the U.K., which is 14, 000 square feet and expected to be similar to its upcoming U.S. stores.

FORBES: Tesco Said To Eye Vega$

Its rival, Best Buy, has decided to close 50 of its large-format stores in the U.S. in order to save costs.

FORBES: RadioShack Needs Big Changes To Fight Its Slide