You build a spacecraft without a watchdog. You'll soon be regretting building a spacecraft without a watchdog. Systems engineering 101 stuff, the watchdog is a

You build a spacecraft without a watchdog. You'll soon be regretting building a spacecraft without a watchdog. Systems engineering 101 stuff, the watchdog is a fail safe on the software system. For those unfamiliar with a watchdog, think of it as STONITH for a single mode system, you design it with two copies of the operating system on two drives or partitions and then if the watchdog doesn't get a response from the computer it forces hard reboot and the system reboots using drive 2, and you send instructions to it to to check drive 1 or wipe it or whatever you want.