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why should that have been unplayable?
Apparently it could be played in many cd roms that had trays, but not ones where you had to insert.
You’re right.
The trays had a groove for a CD. So placing it in the groove it would work because its edges would always fall into that groove correctly all the way around the tray.
This, however, wouldn’t work on a slot loaded drive since they worked by having a set of arms with rollers that grab the edge of inserted disc and another arm with a roller that pushed it the rest of the way in from the opposite edge when it’s inserted enough.
You can see how this worked here on a DVD drive that uses the same setup. https://youtu.be/qi3v7X6BpAA
So there’s only ever 3 slim points of contact which is fine as long as it’s a circle. Yet the irregular shape here would cause it to get partially in and then pushed by the arms into the edge/internals of the drive.
