I currently have a 1 TB Samsung 5400 rpm drive in my MacBook Pro's optical drive spot - but it shuts down after a bit of use (more like crashes entirely). I believe this is because it is a normal hard drive and since there is no way to get the heat out, it shuts down. I'm considering getting a SSD for the bay instead, but want to make sure my overheating theory is correct. Late 2011 15'' MacBook Pro, 240 gb SSD and 1 TB 5400 rpm drive. 8 gb of RAM.