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I have a 2015 iMac 27" retina whose Fusion Drive split into separate drives whilst attempting to fix a partition table issue prior to upgrading to macOS Big Sur.

I have a fully functioning BOOTCAMP partition with Windows 10 on the HDD drive.

If I run diskutil resetFusion to rejoin the Fusion Drive's SSD and HDD, will it destroy my BOOTCAMP partition?

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Yes, all partitions on the SSD and HDD are destroyed by running diskutil resetFusion.

This is explained clearly after running the command; when it asks for confirmation.

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