I'm having compatibility problems too. One DVD (data) that I wrote on the original Pioneer after market install cannot be read on the later factory-intalled DVD drives. I can still read it on the original drive and had to copy all of the stuff over the network. The DVD media I had no problems with on the original drive doesn't appear to be usable on the later drives. By the way, what is a DMR-R drive? On Thursday, September 18, 2003, at 06:53 AM, Karl Seilo wrote: Shirley > I have a Pioneer DVR 105 installed in my Sawtooth G4 with dual 500Mhz, > 1.2G & (2) 100Gig drives. I'm having problems reading DVDs on the > DVR105 that have been burned from Beta SP to a Pioneer DMR-R machine. > The odd part is I can play them with no problems on my G3 800Mhz > iBook. Has anyone had experience with this?