David L From United Kingdom, joined May 1999, 9220 posts, RR: 42 Reply 1, posted (3 years 7 months 1 week 1 day 13 hours ago) and read 3868 times:
It's been a while since I ran CFS 3 but it wouldn't surprise me. Earlier versions of MSFS needed the CD to be in the drive, too. Yes, it was part of the defence against piracy. I have a few games that need the CD to be present - Patrician and Civilization, to name a couple.