Ответ на "Booting from SSD in place of the superdrive?"Hi! Careful with this: some macbooks will not hibernate if SSD start up disk is installed in the optical bay (in those models that have one, of course). The "symptoms" when I did that: MacBook just didn't hibernate, did not turn off automatically after autopoweroff minutes in pmset, nor turned off if scheduled. The consequence of this, a very important battery drain overnight (around 5% per hour) that I just wasn't able to solve applying any pmset setting combination / SMC reset / PRAM reset / macOS clean installation / previous macOS versions. I also spent several hours trying to determine if any startup process prevented deep sleep / hibernation... nothing seemed to work, so I almost gave up and attributed this to a hardware malfunction. But... the culprit was a start up SSD disk installed in a case replacing the superdrive, that is to say, installed in the optic bay. I simply changed the disks places, with the start up SSD connected to the native disk bay, and the issue was solved! Hope it helps!!