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My desktop Mac is c.2015 and I'm in OS Catalina.
I burned three new disks: Maxell DVD-R, Memorex CD-R and Panasonic DVD-RAM. My Mac SuperDrive has reliably opens other disks. But it doesn't open these three.
Why can't I open any of these three disks?
iMac 21.5", macOS 10.15
Thanks for your suggestion. It took a search to find some clear directions for how to reset the NVRAM.
I did reset and no go. I'll just throw the disks away and rely only on my Time Machine and another external hard drive for saving files.
It depends entirely on what is on those disks: are they files, photos, videos, or what? Videos need to be burned with an authoring burn app (not Finder) in order to play as they need to be in a certain format. You should be able to burn files through the finder though.
Aside from that, using disks like that as a "backup" is not necessarily the best idea - external hard drives are best for that.
Thanks. Photos, maybe videos, word files - all files that I've never had trouble with before. Also, I can play older backup disks and download music disks for listening on the computer.
Let it be a mystery. I'll stick to backup drives.
Another possibility is the failure of the drive - the superslim format makes failures common; I've had to have two of them replaced in two different Macs, so i bought an external burner/player a long time ago. It is a tray loading drive, reads anything, and works reliably.
Please reset the NVRAM and then retest.
Try running a disc cleaning disc in the optical drive. Use one that uses dry brushes.
You're assuming I have an internal Mac drive. No, I have an external, which I, too, bought long ago. Never mind.
Well, you did not specify; however, internal or external, they are both the superslim slot loading and easily malfunctioning drive.
SuperDrive malfunction
