given that the A570 doesn't rely on software drivers, but its burnt into rom so its available on start up, i think its really more of a question of getting the filesystem right first time. also given that it took comodore 3 years! to realease the damn thing you'd hope so.
but anything that conforms to ISO-9660 and rock ridge. you may find that files on joliet CD's bigger than 1 megabyte are split into multiple files of the same name.
ie, 2.5 meg file = 1mb, 1mb, 0.5mb.
pain in the arse? yes.
when i had one, it read PC CD's, Sega MegaCD CD's, CDi CD's, playstation CD's.... ok so most of that was pretty pointless, but i thought at the time it was cool to play the audio tracks, and a laugh to be able to copy entire Mega CD games onto a floppy disk