If you had stuff that often crashed there was a write-through mode so it only did read caching. In one of the later versions it also trapped CTRL-ALT-DEL and di

If you had stuff that often crashed there was a write-through mode so it only did read caching. In one of the later versions it also trapped CTRL-ALT-DEL and did a sync before rebooting. It also did a sync each time command.com displayed a prompt. Really some neat coding for its time.