This is just a hypothetical situation, fortunately. I had heard eons ago that SQL Server would shut itself down if it ran out of disk space. Is this an urban myth? What did happen was the database log file and tempdb both ballooned up to around 17G each and there was only 7M left on the drive. I then shrank the database log file, deleted backups that I had secondary copies of and killed the rogue process. I just thought I should figure out what to do if tempdb or a database log file filled up the drive.