Hi Guys, I wish someone could help me with this. I currently have a Mat****a 8587 DVD-ROM drive as well as a brand new NEC ND4550 DVD-RW drive. Every time I try to copy DVD's from DVD+R's, my DVD-ROM just won't read +R's (not even -R's actually) so that I always have to copy first to my HD and then to my DVD. My question is: could I just replace my DVD-ROM drive with the former Liteon DVD-RW 851S I had before? Would it cause compatibility problems or whathever if I connect 2 DVD-RW drives onto my pc? And, If I can, which one should I put in slave or master? Thanks for your help.