I've got the SSD's in the back behind the motherboard. For my 1TB HDD though, that's kind of a tough one. I was playing around with it a little bit last night, while putting the system through a test run. You can kind of see it here in this pic, it's sitting on the floor in front of the PSU. Not sure if I want to leave it there though, sticks out. But I was also thinking of painting it white to match the bottom....just not sure yet.