Agreed, but I don't have a lot of immediate avenues of investigation left, so I was reaching. The event log (app/systeM) showed nothing suspicious around or immediately before the initial failure. We don't have the SAN/RAID guys in until Monday, and stopping the SQL service, even temporarily on Secondary, will require a bunch of form-filling. Ok, actually swapping the disk out is not a lengthy procedure, but I need to make a business case for the switch, and thus need proof the disk is not quite stable.