Pretty sure these have WD Green drives in them judging from what I've read in the past but I do not have one of these to crack open and be sure. Not looking to add space to my system YET either but others might be interested

 

http://www.buy.com/retail/product.asp?sku=206821006&adid=17070&dcaid=17070

Here's a slightly better price ($94.99) and you don't even have to disassemble anything.

 

http://www.buy.com/prod/western-digital-gp-caviar-1tb-serial-ata-3-gb-s-internal-hard-drive/q/loc/101/205083228.html?adid=17654&dcaid=17654

 

I think I may have to place an order for one of these...