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The USB thing?

That's a housing for the old drive. Their product replaces the internal storage. That is a casing so you can turn the internal storage into a USB storage device.

At least I think so. The English in the article is a bit unclear.

http://www.engadget.com/2010/10/21/new-11-6-inch-macbook-air...

" On the plus side, the Toshiba solid state drive seems to be modular, so there's some modest upgrade potential there if you can find a supplier of the mini-SATA boards. Still, kids -- don't try this at home."

Nope, that's clever housing for the memory chip you REPLACE. This makes it easier to get your old data onto the new storage drive, then serves as portable storage. This is a huge value add.

Edit: Parent comment was deleted. still, this thing is a very compelling offer.

I think the point is that it's an -internal- upgrade, that ships with a USB adapter for the existing SSD (that you'll remove).