Mac OS9 data CDs not readable in OSX?

[Marsdy]

I need to drag some files off some data CDs that were written back in the late 90s on a Mac. That would be OS9 era I think?

I’m using an Apple SuperDrive and none of multiple disks I’ve tried will mount in OSX Catalina. Does anyone know of a way to make them readable? The SuperDrive is working fine.

[musicman691]

Maybe the cd's themselves are the problem? Those things don't last forever you know. I've seen old cd's and dvd's with the internal layers failing.

[JFreak]

Most likely bad media. AFAIK there should not be anything different in how OS9 and OSX burn ISO9660 format, a.k.a. CD-ROM. Even if yours had HFS in it, OSX should be able to read it.

[Marsdy]

It seems unlikely every disk would be faulty. I’ve tried over 20 now written over a two year period from various reputable manufacturers.

[JFreak]

That certainly sounds strange. Back in the day I remember PC needed extra software for reading certain Mac CDROM that were not burnt as hybrid, but first I hear OSX cannot read OS9 media

[EGS]

Hmmmm ... to troubleshoot, I'd try a different computer.

[musicman691]

Originally Posted by Marsdy

It seems unlikely every disk would be faulty. I’ve tried over 20 now written over a two year period from various reputable manufacturers.

Doesn't matter. I have boxed collections of Doctor Who reboot dvd's done by BBC from Chris Eccleston through Matt Smith and almost everyone is unplayable due to the media delaminating - you can see the colors when you look at the back of the disks. It's not the normal silver but looks like black & blue from bruising one's body. And these collections are less than a decade old.