Im hoping its more of the fact that most people never scans their collection and/or doesnt know there are such tools. So theres no standardization to the files available, and to what setup people use (non-merged, split, merged)

Its nothing wrong with my hardware, the 12 roms in particular that i keep getting crc errors on are the only 12 files that has happened to, and ive downloaded them all 5 times now to no avail. Maybe its the scanner ? hehehe
Do i really need to be concerned with those errors at all ? The games are playable anyways, arent they ?