Sigma Atlantis Case Review
 

The hard drive cage in this case is very interesting. There is a 120mm fan on one end, and if you remove the two thumb screws on either side, you then can pull a lever out and it unlocks cage, allowing it to be rotated. This feature could make the upgrade or addition of a hard drive easeier after the initial build has been completed. You wouldn't have to take the video card out of the case to be able to slide another drive into the cage this way.

http://www.overclockersclub.com/reviews/sigma_atlan/