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haveo
I reckon Scilly is correct. The composite side of the disc has broken where it's sandwiched by the internal/external parts of the hub flange.
You shouldn't be able to rotate this without removing the three flat-head screws of the outer flange plate.
Inside of the hub might look a bit like this:
https://www.flickr.com/photos/cronobikes/5513058996/in/album-72157612232975593/