The Windows NT family of operating systems also does the same and reserves the key combination for its own use. Malware may prevent or subvert a warm boot by intercepting the Ctrl + Alt + Delete key combination and prevent it from reaching BIOS. : 509Ī ' warm boot is initiated by the BIOS, either as a result of the Control-Alt-Delete key combination or directly through BIOS interrupt INT 19h. Both the operating system and third-party software can initiate a cold boot the restart command in Windows 9x initiates a cold reboot, unless Shift key is held. For the attack called a "cold boot attack", see Cold boot attack.įor IBM PC compatible computers, a cold boot is a boot process in which the computer starts from a powerless state, in which the system performs a power-on self-test (POST). The boot reference carried over to all subsequent types of computers. If the computer crashed, it was rebooted. Thus a cold start was called booting the computer up. This set of initiating punch cards was called "bootstrap cards". This process was likened to an old saying, " picking yourself up by the bootstraps", referring to a horseman who lifts himself off the ground by pulling on the straps of his boots. This first card then instructed the machine to read more cards that eventually loaded a user program. On systems with cards, the computer was initiated by pressing a start button that performed a single command - "read a card". The input was often a stack of punch cards or via a Switch Register. The term restart (as a system command) is used to refer to a reboot when the operating system closes all programs and finalizes all pending input and output operations before initiating a soft reboot.Įarly electronic computers (like the IBM 1401) had no operating system and little internal memory. Reboots can be either a cold reboot (alternatively known as a hard reboot) in which the power to the system is physically turned off and back on again (causing an initial boot of the machine) or a warm reboot (or soft reboot) in which the system restarts while still powered up. In computing, rebooting is the process by which a running computer system is restarted, either intentionally or unintentionally. For other uses, see Reboot (disambiguation).
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