CD/DVD not loading Yosimete or in Snow

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Going back to back ups on CD/data DVDs possibly created in OS 9. I have tried to mount these discs in Yosimete and in Snow and the drive seems to go into a loop and at one point I had to shut down in an attempt to just eject let alone mount on my desktop.
I can remember the 'old' days in OS 7 when the Mac would try to open anything-even PC discs!
Ok, I appreciate software that old won't open, but what about eg., jpg files etc...?
 
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Silver M1 iMac 512/16/8/8 macOS 11.6
No they will not as Classic does not perform on anything later than Tiger OS X.4. You might like to investigate a program called SheepShaver.

Cannot comment about being compatible with Yosemite. Was compatible up to Classic OS 9.0.4. Find chas m on the threads and shoot him a Personal Message. Do this by clicking on chas' name in a post.
 
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Your Mac's Specs
2011 27" iMac, 1TB(partitioned) SSD, 20GB, OS X 10.11.6 El Capitan
Does the CD or DVD actually mount with your Mac?

And a .jpg that was a .jpg in System 9 or earlier is still a .jpg in any Mac OS X and should still work.

The later OS X just won't bother trying to read any extra resource parts of the file and doesn't need them. Same with .txt files and a lot of others.

Classic or PPC support only get involved with propriety files like AppleWorks etc., and it's latest files can work up to including OS X 10.6.8.
 
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Sorry for my sluggish reply PM-r.....No, these older discs will not mount at all!
 

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