Superdrive plays movies, CDs, but ejects DVD-R
I am trying to burn a DVD -- first one in a long time. My circa 2010 Mac Pro with Superdrive is ejecting DVD-R discs, but happily plays DVD movies and CDs. When inserting a DVD-R, the drive goes through 2 cycles of what appears to be reading the disk, then the Superdrive door pops open. Any idea what this problem is?
Thank you.
Mac Pro, OS X Mavericks (10.9.5), 10 GB RAM