DV-5700a; trouble reading discs



I have a older NEC DV-5700a that has trouble reading many discs. Either regular data CD’s or DVD’s.
Pressed media usually isn’t a problem, but many, but not all burned media is.
I ran Nero CD-DVD Drive Speed and it just shows a slower drive though a couple of burned data DVD’s (tp files from a HD tuner card) showed errors where my NEC 3520 burner (where they were burned) showed ok (naturally).

Is this just a poor older player and does it matter if it is a master or slave (both are on the same IDE bus).

O/S; 2k w/sp4
nForce2 MB