[G4] Should Pioneer DVR-104 read DVD+R discs?

[Aaron]

My G4 Dual 867 MDD came with a Pioneer DVR-104 "superdrive". (I bought it used but I think that it's the drive it came with originally. I added a LITE-ON DVDRW SOHW-1673S when I bought it. Since the Lite-On reads and writes practically everything, and is much faster than the Pioneer, I seldom use the latter except occasionally as a test drive to see if the discs I write on the Lite-On are playable on other drives. (I use a couple of stand-alone DVD players for the same purpose -- but only for video, obviously.)

I noticed recently that the Pioneer not only doesn't write to DVD+R discs, but it doesn't even recognize them, either in the Finder or with Toast! In fact, it just makes noise until I eject the disc. Is this standard behavior for this drive? I had been under the impression that DVD drives would generally read most discs even though they might be restricted in what they write.