I have an early 2011 MBP which has had the internal optical drive removed and a second HDD added. I performed the plist edit to allow an external SuperDrive to work with my machine. I did this edit whilst my machine was running 10.7.5, but recently I upgraded to Mavericks and - it must've been a couple of weeks after the upgrade - I finally re-attached my SuperDrive but I now get the below error: Any ideas? I've done the SMC and PRAM resets. Is there any extra I have to do under Mavericks? I have checked the plist and it still has the "correct" entry.