The set titled "[REDUMP] Disc Image Collection: Sega - Sega Dreamcast updated 2022-03-11 (06-54-1448)" (redump.dc.revival) by _atrac17 has tons of unzipping errors. I've been downloading them by letter with Internet Download Manager and a third of them have errors! Good thing I stopped at F before I actually started to unzip them (always with 7-Zip).
The set you really want is "Redump Sega Dreamcast" (redump.sega_dreamcast) by the Goat 99. No errors so far.
This is not a criticism of _atrac17, however. The other sets the guy lists are solid! I was comparing the file sizes between the sets, and sure enough, I saw different file sizes for known corrupted zips. But then I saw that the file sizes of all matching games were different. I think I'll actually test known good games from redump.dc.revival, and if that doesn't even work then I'll just redownload everything from redump.sega_dreamcast.
