What is Booting ?
Boot means 'start' or make the computer system ready for taking instructions. The word "boot" comes form "bootstrap",since bootstraps help you to get your boot on; likewise, booting the computer help it to get its (ROM) instruction loaded in its main memory.When the computer is fist switched on, it is called cold booting. When the computer is already ON and is being reset, it is called warm booting.
- As soon as the computer is turned on, the basic Input/Output system (BIOS) on your system's ROM chip is "woken up" and take charge. BIOS is already loaded because it is built into the ROM chip and unlike RAM, ROM content do not get erased when the computer is turned off.
- BIOS first does a Power-on Self Test"(POST) to make sure all the computer's component are operational. Next, the BIOS's boot program looks for the special boot programs that will actually load the operating system onto the hard disk.
Booting sequence
- Turn on
- CPU jump to address of BIOS
- BIOS runs POST(Power-on Self Test)
- Find boot-able device
- Load and execute boot sector from MBR
- Load operating system.
Comments
Post a Comment