Hello
None of the proposed solutions worked for our MacBook Pros (Retina, 15", End 2013) - upgraded to MacOSX 10.11.6 from MacOSX 10.9.5. The solution by modifying the com.apple.Boot.plist file helped only, if SuperDrive was attached to MacBooks before reboot. Unplugging thereafter the SuperDrive and reattaching it returned to non working state.
So I decided to install a fresh install of MacOSX 10.11.6 to a Memory-Card to test for SuperDrive behaviour. On this new MacOSX install the SuperDrive worked as expected (as before upgrading to MacOSX 10.11.6) - unplugging/plugging in several times. So I created a diff report from the System Folder on our MacBook Pro's internal SSD and the the fresh System install on the Memory-Card. The MacBook Pro /System/Library/Extension folder showed a number of additional kext extension not present on the fresh System on the Memory-Card. So I decided to remove them (moved to my desktop folder) and after that, I restarted the MacBook Pro from its internal SSD and the SuperDrive worked again as it should (unplugging/plugging in several times). Here is a list of the additional kext extensions that I have moved out:
/System/Library/Extensions/CNQL1212_ClassicNotSeize.kext
/System/Library/Extensions/Channel_dPAD.kext
/System/Library/Extensions/EPSONUSBPrintClass.kext
/System/Library/Extensions/ElmediaPlayer.kext
/System/Library/Extensions/EyeTVAfaTechHidBlock.kext
/System/Library/Extensions/EyeTVCinergy450AudioBlock.kext
/System/Library/Extensions/EyeTVCinergyXSAudioBlock.kext
/System/Library/Extensions/EyeTVEmpiaAudioBlock.kext
/System/Library/Extensions/EyeTVVoyagerAudioBlock.kext
/System/Library/Extensions/HuaweiDataCardDriver.kext
/System/Library/Extensions/IceraUSBMassStorageBypass.kext
/System/Library/Extensions/NMHuaweiPhonesVTPCDC_106.kext
/System/Library/Extensions/NMLGEDriver_106.kext
/System/Library/Extensions/NMSamsungDriver_106.kext
/System/Library/Extensions/NMSmartplugSCSIDevice_106.kext
/System/Library/Extensions/NovatelWireless3G.kext
/System/Library/Extensions/NovatelWirelessFilter.kext
/System/Library/Extensions/NovatelWirelessUSBCDCECMControl.kext
/System/Library/Extensions/NovatelWirelessUSBCDCECMData.kext
/System/Library/Extensions/Option72.kext
/System/Library/Extensions/OptionHS.kext
/System/Library/Extensions/OptionMSD.kext
/System/Library/Extensions/OptionQC.kext
/System/Library/Extensions/PACESupportFamily.kext
/System/Library/Extensions/RIMBBUSB.kext
/System/Library/Extensions/RIMBBVSP.kext
/System/Library/Extensions/RemoteVirtualInterface.kext
/System/Library/Extensions/Terminus.kext
/System/Library/Extensions/ZGUSBCDCACMData.kext
/System/Library/Extensions/ZGUSBMassStorageFilter.kext
/System/Library/Extensions/ZTEUSBCDCACMData.kext
/System/Library/Extensions/ZTEUSBMassStorageFilter.kext
/System/Library/Extensions/cdc.kext
/System/Library/Extensions/cdc_ecm_qmi.kext
/System/Library/Extensions/cdc_ecm_qmi_zg.kext
/System/Library/Extensions/cdc_zg.kext
I guess that the cdec.kext extension may be critical for proper function of the SuperDrive
best regards,