A Blackbox is a corruption of an ancient concept from the early days of flight; as ships went faster, as weapons got more dangerous, and larger forces were involved, recording information became trickier and trickier. Overwhelming radiation can damage materials. A direct collision with an object moving at half the speed of light can just turn an entire ship into plasma with just one shot.

A blackbox is made using the same techniques that make mechs as sturdy as they are; extremely dense material formed into complicated nanostructures, light enough to be handled, but sturdy enough to survive intense forces. That being said, it can still be penetrated and destroyed, it’s just exceptionally difficult to do so.