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Re:Sega Saturn CD – Cracked after 20 years (2016) [video] by mewse-hn on Thursday June 16, 2022 @10:41AM (#31766614)
Saturn has several options for playing backups:

Pseudo Saturn Kai: a firmware for the pro action replay cartridge that will boot non-official discs. Affordable and no modding required.

Phantom mod chip: like a classic playstation mod chip, but it plugs into the ribbon cable between the optical drive and the main system board. It needs one wire other than the ribbon cable, to provide 5V power.

Satiator: As shown in this youtube video, plugs into the VCD port on the back of the system and runs backups with no modding required.

Optical drive emulators: TerraOnion MODE, Fenrir, Rhea & Phoebe, these all replace the CD drive in the stock console.

Re:Sega Saturn CD – Cracked after 20 years (2016) [video] by JohnBooty on Thursday June 16, 2022 @03:00PM (#31769646)
Great overview, one correction:

Satiator doesn't play backup discs. It plays your games directly from an SD card.