This server has a pair of IDE drives which I had set up as a mirrored pair. These are the only disks in the system. When I logged into the server yesterday, there was a message on the screen saying that a disk which is part of a fault tolerant set could no longer be accessed.
I looked in Disk Management and saw that the mirror no longer existed. One disk is sat there as a completely empty partition, and the other is now acting as the sole system disk and has errors on it. The Event Log contains messages saying that there are bad blocks on this drive.
I haven't done an ASR backup. What are my options for getting the operating system onto another drive?