So, I've taken a habit of destroying terminals after I can't use them (or they become too risky to use rather). But some terminals, I found are very very hard to destroy.... after they impervious to certain damage? If so, what kills what? Here's what I've found on my own experiments.
Level 1 Terminal Level 1 machines (aside from terminal)
Emp gun. Mining Laser
Cannon (any) Melee Weapon
Mining laser Explosives
Explosives.
Melee weapons
Level 2
Melee weapons...