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Also, zip should not be smaller than 7z, unless maybe zip deals with incompressible material better and the stuff being compressed is mostly incompressible (perhaps xbox padding).

I think your right, but since the Diffing stage, its actually beeter your way, before diffing was introduced your right zip handled the garbage better, in ngc and probably Wii we would have seen this.

Your new way is the best so far, for maximum savings. I am currently re doing all of those ngc to see how much is saved over a larger field.

Note: Tiger Woods PGA Tour 2004, tried to diff, but no diffs were created, and as I expected, my compression on the old set was identical in size, so nothing gained, nothing lost.