I've been curious about burned CDs etc for a while now. And since I sent Old Rover a US Duo to do testing of MSR, I needed to figure out how to make burned games that work on original hardware.
I've been using an image of the Gate of Thunder 3 in 1 cd. Without fail, every time I burn this game, it crashes or near crashes at the intro where bonk is coming into the spot light. The laser will typically jam up against the outer stop (on a Duo system)
First I tried whatever I had laying around (who knows what brand 80 minute CDRs) As expected, the laser jammed.
Next I tried some high end Taiyo Yuden 80 minute CDRs... they didn't crash the laser, but it still struggled to read at the point where I usually see them crash. Sometimes it would get past that point and run, but most of the time it would just re-read and re-read and then quit. Also, the laser is quite noisy when reading these discs.
I started doing some reading about CDR media and how it works. There is a lot of talk about dye colors and reflectivity etc, and maybe those things have some bearing on playability. I was more interested in what I read about the comparison of the different capacities of CDR media. Apparently, the data track is a long spiral from the inner part of the CD to the outer. On all CDR media, this distance across the disc surface is the same regardless of capacity. To attain the larger capacity on say 80 minute discs, this spiral data track is wound more tightly and is smaller in width. The downside to this is two fold, less room for error since the data track is smaller and also the data is packed much closer, so the distance between the tracks is smaller. On older players, these smaller, more tightly packed data tracks can be difficult if not impossible to read by an older laser setup.
To test this, I bought some 74 minute MAM CDRs. First burn of Gate of Thunder worked flawlessly. The laser made no more noise than if I was using a glass mastered disc. Maybe this is just dumb luck, but I think the 74 minute vs 80 minute might be the key to problems with burned games.
All my tests were done on a stock original PCE Duo. (original laser, all original caps, all factory adjustments)