My 4,1 came with two SuperDrives and both seemed overly noisy so I swapped in a Samsung SH-S243 drive from a PC. Sometimes that drive would keep a disc spinning after it finished accessing it though it works fine in my PC. I ripped a DVD and noticed the drive was still going a few minutes after the rip was done. It stops if you eject the disc but its still annoying. And it sounded like the drive might have been trying to randomly read discs sometimes even when one wasn't inserted. I swapped it for an LG GH24LS70 that I picked up off Amazon. It doesn't continually run after reading a disc but its definitely got a mind of its own as I can hear it clicking and whistling randomly. Even during normal use its got a really annoying whistle so I think its going back. What is a decent known working DVD drive? I want one without riplock (or at least the ability to disable it) and its got to be able to boot OS X if that's possibly an issue - I can't recall the last time I had a drive that wouldn't boot a Mac. I'd like to know models, not just brands. I did a bit of searching an LG drives seemed to be generally working out for people so that's why I bought the LG but its acting up as well. Between removing the SuperDrives and installing the Samsung drive I did put a Crucial M4 SSD in the lower optical bay. I don't see why that should cause the drives to behave oddly but then I never had an optical drive act like these two have and have never owned an SSD before so maybe it could be an issue.