Why an operating system always reside on hard disk of pc?

Answer 1

maybe a cloud systeme :)

Answer 2

If you have super faster Internet use chrome os.. Is store not in your hdd.

Answer 3

what are other options?

Answer 4

cloud storage will require internet connection all the time when we have to use pc..its not a good thing as many people still can't afford internet all the time

Answer 5

OS controls all the computer resources while it is in use.
one can use RAM as the access from the same is much faster. But since RAM is a volatile, as soon as computer is turned off, the data stored it in is lost.
So, OS is generally installed and stored in hard disk as it is non-volatile .and hence OS doesn't lose on turn-off the computer.