Well, everyone else gets to ask off topic questions, so its my turn. 
Maybe one of you will recognize this incredibly bizarre issue and have an 
idea.

Yesterday, my Power Mac 9600 stopped recognizing CDs that I burned. They 
burn successfully, and Toast even completes the verify process. But when 
I put the disc into the PM 9600 (same machine it is burned on), it waits 
then spits it back out. It does this with both the internal drive, and 
the external burner (the external drive actually complains the disc isn't 
readable and gives me the option to format it, eject it, or route it to 
Toast, the internal drive simply spits it back out).

Ok, that isn't that odd... could be a drive/driver issue. Replaced the 
drivers, still doesn't recognize the discs. I don't think it is a drive 
issue as it happens with both the internal AND external drive. AND, any 
CDs that I haven't just burned, or any factory CDs read fine in both 
drives. So drives and drivers appear to be ok.

So it looks like it is a burner issue. Ok, not so odd. BUT, here is where 
is starts to get strange. If I put the freshly burned CD into a different 
Mac, it reads it just fine. So the CD appears to have burned correctly. 
Humm... so something is screwy on my PM 9600 then.

BUT WAIT... now it gets down right loony. If I take the CD that I just 
read fine in another Mac... and put it back into the 9600... NOW the CD 
reads just fine. WTF?!? The Mac that read it doesn't have a burner, so 
nothing new is being written to the CD, so what can possibly change that 
suddenly makes the CD readable in the 9600? And if it is readable now, 
why wasn't it readable to begin with.

I have reproduced this now on 5 CDs, so it doesn't seem to just be a 
fluke. And it isn't just letting the CD sit and cool, as I tried again 
this morning with ones from yesterday and they still weren't readable 
until AFTER I read them in another Mac.

For reference, this is OS 9.1 on a Power Mac 9600 using the OEM Matshita 
24x internal scsi drive (bus 1, ID 3) and an external Yamaha 6x burner 
(bus 2, ID 2). SCSI termination appears to be ok, but I haven't 
sacrificed a goat to the SCSI gods recently, so I can't promise that it 
is. The CDs are 80 minute, 700 MB 3M branded CDs (bulk pack spindle).

Anyone have a clue what the heck is going on?

-chris
<http://www.mythtech.net>

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