Will expand this over time, just starting to run across a few bigger projects that need to be done to check and clean up sets of DATs.
* Fujitsu FM-7 (and others using the D77 image format) -- D77 format has headers, check if any of our alts vary only in header. Looks like No-Intro zeroes the header bytes, may be the right approach
* IBM PC Compatibles (and others that may have been touched by WinImage at some point?) -- check for images containing "Disk formatted with WinImage 6.50", these are not imaged floppies but created as blank disk images using WinImage with files then injected to the image. Arguably shouldn't be considered, can create infinite alts out of nothing?
* Atari Jaguar -- check for ROMs converted using JiFFI, this leaves a watermark that should be 00ed
* Atari 7800, Nintendo Famicom Disk System -- needs a recheck for header issues here
* NES -- huge project ongoing here to update to NES 2.0 headers per modern standards. Working on it but messy and very long-term as huge numbers of hacks etc. need to be checked compared to other databases.
* MSX -- check for dodgy romanization/translation issues. Names shouldn't look like e.g. "Arubatros. Albatross" or "Batten Tanuki no Daibouken. Raccoon Dog"