I made this after my friend dropped his external HD on the ground and lost all his data. He mentioned that he didn’t know that the case hold a real hard-disk, so he was not cautious when dealing with it.
My friend thought that the external HD was a big flash memory pen drive, because it behaved like one. The case didn’t provide enough safety for hard-disks and even the advertising encouraged incautious handling. I think that if users can see what’s inside, they would probably be more cautious.