The disc part of the rotor separated all around the seam where the disc part meets with the hub part. You could see that about 1/16 in. of metal was all that was holding the disc part to the hub part. The hub was still spinning freely, with the disc just sitting still in the caliper.

Road salt is the likely culprit. All cars are crusty white up here these days. You wash your car and the next day it's crusty again. You just can't win. I try to not use the diesel for my short winter trips in order not to expose it too much to salt, I have a 89 accord beater for that. But when I need to do road trips, I always take the TD so I can burn WVO.

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Denis

1979 300TD 189,000 Miles, now running WVO with a home-made 2 tank conversion
1974 230 Gasser 189,000 Miles, For Sale
1961 VW Microbus 162,000 Miles
1961 Ford Fairlane 500, 53,900 original miles
1951 Oliver Super 55 Tractor
2002 Chocolate Lab