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You never know for sure when it's a D2C2, but D2C-"1" is easy to spot.
In general it's hard to spot a D2C2, but a lot easier to see if a drive has a D2C-"1" chipset.
IF your drive does NOT have the metal clip above the spindle, then the drive is for sure an old D2C.
Here's some "educated guessing" about what happened in the process:
Nintendo probably did some design changes in the DVD drive which took effect immediately at all the different locations in the manufacturing "chain", but took some more time to follow through the entire process and affect the end product.
The most important change is of course in the D2C chip itsself. But from IC manufacturer to pick-n-place machine that solders the PCB's takes some time, which explains why there are still "old" D2C chips in the drives that look like they're new.
Another change is in the PCB manufacturing, which is another layout and looks like it's from another machine/factory and might just be for an increase in production, nothing special.
The metal clip above the spindle was a change that got applied in the end of the manufacturing chain (the final assembly) and is the first change that you'll see. This explains why all D2C2 chips were in a drive that also had a metal clip, but not 100% the other way around.
The only thing that baffles me is the missing second line on the D2C chip. So far I've seen just as many old D2C chips without the second line as D2C2 chips WITH the second line. Usually there are some markings on the BOTTOM of the IC that tells something about the manufacturing date, plant, etc. whch could explain the difference. But I'm not going to solder off the whole chip just to take a look, because it's not important.
D2Pro9 v2 works fine btw. Excellent chip.
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