PC CD RW won't mount on Mac Pro

[harv822]

Have a number of PC-created CD RW disks (UDF format) backups. Some will mount on the Mac Pro (Superdrive, Apple shipped, Pioneer DVD-RW DVR-112D).
Those that don't mount can't be ejected except during a Restart. Disk Utility can't do anything with it--all useful options are grayed out. The drive appears in Disk Utility, as does the disk, but it's grayed out too.

Thanks for any suggestions. Am new to Macs.

harv822

 

[harv822]

It's the disk (maybe)

I hate to reply to my own posts, but...

Logic would say that if some disks are mountable while others are not, the problem is with the disks.

After more monkeying around, I erased and rebuilt the stuff on the disk. The old version had one folder and four files. The new one has two folders, with one folder containng the same four files. This is the same disk that wouldn't mount.

Put the disk in the Mac drive, and it mounted. Copied the four files where they needed to go.

So what have we learned? That the Mac Superdrive is fussy? That the UDF format is error-prone? (read that somewhere)

Any ideas?

Thanks