I lost tons of work when playing with toy assembly language programs in DOS, when I would save and compile and run it and it did something to crash necessitatin

I lost tons of work when playing with toy assembly language programs in DOS, when I would save and compile and run it and it did something to crash necessitating a reboot, faster than SmartDrive would write the cache to disk. Particularly for anything crash-prone like messing with hooking interrupt vectors.