is that even possible tho?doubt the car 'was in service' when that happened ....
...I had a disasterous Opel Ascona for a short period of time years ago when I was 18 or 19 at college, with bad brakes -discs looked 'badly scored' but i ignored this fact; I scraped together the cash for new pads for the front of it, and fitted them - on attempting to 'gently bed them in' on a test drive, the disc part completely seperated from the hub part; I did lube pads shoulder in the caliper but the extra grabbing power must have been too much for the old disc and it quickly seperated into two parts.......