Follow-up. For the MZ-S1 at least, recording with an optical cable from my Mac G5 overrides that auto track mark feature (after 2 seconds of silence). The recording mimics the tracks on the source CD. For what it's worth, although I was able to get 'Simple Burner' to launch in Virtual PC on my mac, and although I have the correct driver for the MZ-S1, the MD was only occasionally recognized, and when I tried to initiate a recording, the Simple Burner program would always crash. Thanks for all the suggestions.