When I shut the lid of my mbp and it goes to sleep, and then I open it again after around 10 minutes, the optical drive makes that mechanical noise you hear on startup. I looked around and people say it's checking to see if there is a bootable disc inserted, but surely it should only do that when the mac is booted up from shut down rather than when the mac is woken after sleeping for 10 minutes. I'm pretty sure this has only started happening since I upgraded to a Samsung Evo SSD, unless there was an update that caused this to start happening. Anyone have any idea what's causing this?