So... Lots of rants about hacking.
Let me yell you a story...
Two decades ago I was asked to fix the school library computers and block then from using mIRC.
I cleaned all the machines, reinstalled the pirate copy of windows I was provided, blocked installing programs, blocked running of programs except the ones required (office, Netscape) and vnc in every computer, that I could access in a off-site computer.
Next day all the computers had mIRC... Just to show how kids are smart... Someone changed the MIRC.exe to iexplore.exe and that way could execute any program he wanted...
Invisible hard drive? Just use command line (so he could copy mIRC to a hidden folder)
Still, scared lots of kids, wen watching porn and a message would pop up , asking to not watch porn in school, but never couth the guy