Cannot open external dvd unit

Hello!
I use mi iMac a lot. I avoid using the Superdrive to preserve it, and because it is pretty slow, compared with my external units. Problem is these units won't respond to eject key (neither keyboard or device's) unless I restart the app or unplug the unit and plug it again. I have tried to trash the icon, right-click-eject, etc, and it will make the icon dissappear, but won't open the unit.
Any help? Thank you guys
< Edited by Host >

Hello
It seems that I have been edited by host. It also looks like there is a couple of "helpful" o "solved" answers, but I do not know how to get to them. Any help?
Thanks

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Cannot open external dvd unit

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