Booting process

What is a booting?

The process of starting up a device or computer.

The booting process is ensure all the hardware and system software is working in proper way and ready to use.

Process happened in booting process are:

As soon as the computer is turned on, BIOS is run. BIOS is a software is built into computer's ROM.
BIOS starts the OS and supports the transfer of information between hardware devices.



BIOS= Basic Input Output System

The BIOS performs a POST to check the hardware components for proper functionality.

The BIOS then looks in bootable devices such as Hardisk, CD, etc for the special boot programs that will load the operating system from the hard disk.

The BIOS next looks and copies the information to spesific locations in RAM. This information is know as Master Boot Record (MBR)

MBR loads kernel into the RAM and process the memory, CPU and managing hardware.


Kernel is the core of the operating system.

Once the system files are loaded, the OS is ready to take control of the system.

​There are two types of booting:

1. Warm boot: Pressing the POWER/RESTART button while the computer still on.
2. Cold boot: Pressing the POWER button when the computer is off.