Why does the disk not work anymore in my mac?

I've been using the same two discs to revise for my driving theory test in the same MacBook Pro and never had any problems. Now today, suddenly it has decided to stop working, both of them. When I click the icon to open the application and go through the normal steps it says there's an error. I put the disc back in after taking it out and just waited to see if the application would open itself and my comptuer just ejects the discs. I really don't understand why this is happening because this has never happened before and before you ask, yes both discs are clean and neither are scratched.

Try restarting your Mac and try again.
If that didn't help, startup in Safe Mode
A Safe Mode boot takes longer than a normal boot so be patient.
Once you are in Safe Mode, click Restart from the Apple menu then try the discs.
Safe Mode clears system caches that may help.

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Why does the disk not work anymore in my mac?

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