Well, okay that's weird. After adding a 4th internal drive into my mac pro, my internal DVD drive (the one shipped with the machine) has vanished... I've shut down, rebooted, repaired... many times. But the DVD drive has vanished! No icon on my desktop, nothing at all. However, if I fire up Toast8, it happily sees the drive, can eject and burn discs... Can anyone suggest how to get the disk back onto my desktop?