On occasion your Mac may decide not to eject a CD or DVD, luckily there are a few simple methods for ejecting a stuck disk:
Tag - stuck CD
A Cleaner Mac is a Faster Mac.
There is no better tool for cleaning your hard drive from junk than CleanMyMac 3. Some speed issues on the Mac cannot be resolved but using an app but the ones that can are covered in this comprehensive cleaning utility.
But that's not all CleanMyMac 3 can also clean up after uninstalling apps and will remove temporary files, plugins, redundant files and much more. It’s a utility that should have been built into macOS from the beginning.