FIRMWARE UPDATE FOR INTERNAL SUPERDRIVE
This might help. If you haven't done so yet, try installing Apple's SuperDrive Firmware Update 3.0, which is on Apple's support site at http://support.apple.com/en-gb/HT201953 to see if that resolves it. Apple says "This update addresses noise made by the optical disk drive during wake from sleep on your Mac." Although not related to what Apple mentions, the firmware update seems to be important for making external SuperDrives work in Yosemite, and it is one step I used to get my SuperDrive to work in a USB external case when plugged into my MacBook Pro.
Please let us know either way, whether the firmware update helps or not in your situation.