DVD and CD sharing should be disabled
Sharing your CD/DVD device can be useful, when you access a Mac with a DVD device from Macs without. But disabling this sharing can be easily forgotten, and others may can read your CD/DVD.
How to fix it
macOS 10.11 – 10.14
- Go to “System Preferences” > “Sharing”
- Disable “DVD or CD Sharing”
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