I would like to address an issue i have since Yosemite, which didn't really bother me until now. I have an external hdd stack (USB 3.0), on which my media library is stored. If i start my iMac normally, this drive is mounted and iTunes is able to find it. If i make a reboot. the drive isn't mounted - but still powered on, since it does not go into standby during a reboot - and i can't use my library. The only option is to to a shutdown and restart. I even added the drive to my user account, which did help with an external drive a couple of years ago. Didn't help in this case. Is there another solution to ensure the auto-mount of the external drive, regardless of the state of OS?