Blank CD's and DVD's not mounting - burnt disks do!

I am unable to burn CD'd and DVD's. I insert the disk, it goes in and remains in but then - Nothing. My prefs are set to Ask what to do, but none of the pref options have any impact. I can then eject the disk using the eject button. Disk Utility and System Profiler shows the Optical drive as
Media:
Type: CD-R
Blank: Yes
Erasable: No
Overwritable: Yes
Appendable: Yes
Write Speeds: 8x, 16x, 24x
If I have a CD-R in the disk- so the drive is clearly identifying a blank.
Inserting a DVD+R returns
Type: DVD+R
ID: RICOHJPN R02
Blank: Yes
Erasable: No
Overwritable: Yes
Appendable: Yes
Write Speeds: 2.4x, 4x, 6x, 8x
The optical drive is recognising the disk.
But the burn function is not booting.
This is independent of brand of disk. It loaded and burnt disks successfully previously and seems to be related to an OS update. I do this so rarely that I cant really date the start.
I am able to insert and read any type of burnt or recorded disks, CD's, DVD's and mount them.
Have repaired permissions and trashed anything that looks like a CD pref. Have the same problem on my wife's side so it looks like it is not limited to my user account but is a a high level system issue.

A blank disk should never mount. By definition, it has no filesystem and nothing to mount.
A blank disk should be detected and perform the action that you set in System Preferences > CDs & DVDs. If these are set to Ignore (or if the system is treating them like it's set to ignore), then nothing at all should happen when you insert a blank CD or DVD.
I would suggestion going to System Preferences and altering the setting for both CD and DVD to anything other than the value they are set at now, then insert a blank disk and see what happens. Also, try to burn a disk using a burn folder.

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