> In addition to the CHD format versions, the CHDs themselves were sometimes redumped > or modified, so there can be multiple versions of a CHD with a single format as well > as CHDs with multiple formats over time.
And sometimes the CHD produces the checksum no matter what version it is, so you don't necessarily have to upgrade it either. I still haven't upgraded any of the unchanged v4 chd's. I'm not sure if anyone on the mame team has.
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