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[Ferryman]

For use in raw bins with 2352 bytes per sector.

[Roman]

Why? What should be the use case?
Having a single ecm encoded file and the datfile lists the single not encoded one with its original size/hashes?
I guess there are not that many collections out there which actually use it at all, are there?

Do you have any examples where it is actually used?

[Ferryman]

It's not used anywhere that i am aware off, I just wanted to further reduce the size of my collection. A selfish request but it worth a shot.

As a side note can you merge versions of cd images like roms?

[Roman]

"Merging" is a term which is used within MAME and cmpro and simply means that you define on datfile basis parent/clone relations of sets.
So it's just a question of how you write a datfile for your cd images and how you organized the relations in there.

And in days of cheap multi terabyte hds I don't think you gain anything worthy when switching from e.g. 7z to ecm (however I admit that I have no idea about the compression ratios of it), so no, ECM won't be supported in the near future.