Operating System :: Basic Concepts (OS Structures ) - Discussion

AA cold boot is when power to a computer is cycled (turned off and then on) or a special reset signal to the processor is triggered.

BA warm reboot is restarting a computer under software control, without removing power or (directly) triggering a reset line.

CA hard reboot is restarting a computer under software control, without removing power or (directly) triggering a reset line.

DA bootstrapping process is one which starts operating systems when the user turns on a computer system.