They ran out of 500GB Seagate hard drives, so now they have this deal going. I have no idea about the brand. I was told it's USB 3.0
Edit: unsure about stock levels, there were at least 7 more there when I left around 2pm.
Double edit: Hard drives may be used or refurbished, currently unclear. They are not advertised as such, be wary
Nice commenters below (thanks fleet and olokon) have pointed out the drives may not be of such a high quality, see the comments for more detailed/technical information. It does work fine for me though.
when did you go there? can you confirm there are more than one unit on sale?