A full torrent of Sega CD (USA only) is 64.44 GB, but unfortunately that 1) is compressed, and 2) is in actual GB, not the 1000*1024 that are used for measuring SD cards, so it wouldn't fit. It would fit on a 128G card though. Wikipedia lists 210 games for all regions, which if you assume 500 MB each uncompressed on the average would be 105 GB and would fit on a 128G card.

If you count 32X CD separately, of course, it would fit.

The magic of google gives me 125 games (but lots more non-games) for CD-I. Depending on how close to max CD size they are, it's *possible* they could all fit on a 64G card, but who really knows.

Jaguar CD has 11 games plus 9 prototypes which should fit. The Nuon had 8 games and 3 samplers, which may or may not fit depending on how big they are (Nuon was a DVD system). The PC-FX had 62 games. This should also fit.