IMac – Does fixing a Fusion Drive using ‘diskutil resetFusion’ destroy the BOOTCAMP partition

From my hands-on experience, I'd have to say, "negative".

I've created a couple of fusion drives on a 2008 Mac Pro from devices with preexisting partitions. Building the fusion in Core Storage destroyed all partitions on the media.

The issue, it seems, was that the hard drive was in the optical bay. I found claims that Windows was designed not to boot from external drives, and that if you put an HDD in an optical bay and try to boot Windows from it, it will fail.

I have no idea if this is an accurate statement, but what I do know is this: when I switched my HDD back to its original position and put the SSD in the optical drive bay, Windows started booting again as though nothing had happened. The fusion drive still worked, too.