My Mac Pro has its original built-in DVD burner, which has always seemed to work fine in the past. Sometime in the recent past (10.9.1?), it simply disappeared.
I first noticed that pressing the eject button on my keyboard didn't do anything. I looked up alternative ways to eject the tray, and I found the "drutil" program, which seems to confirm that OS X doesn't see any drives at all:
$ drutil list
Vendor Product Rev Bus SupportLevel
$
I've rebooted, and that doesn't help. I don't even know how to debug this. Where do I start?
Best Answer
I rebooted a second time, and now it works. Crazy.