What exactly is booting process??
We have heard about booting process from our brilliant friends,
teachers or from random youtube videos. If you ever have been amazed about what
exactly is booting process then this is the collection of basic information about it.
It is a process that initiate right after we press the power
button until your desktop get available on your monitor. All the process happening
during this interval is regarded as booting process. Booting is the process of
starting a computer. When we press start button then at that time computer’s
CPU doesn’t have any software in the main memory. So there must be some process
that must load software into memory. And it has some steps to be executed.
In this booting process, initially the diagnostic testing
sequence i.e. POST(Power On Self Test) tests that all the device connected on
the computer are on proper working condition or not. If they are not on proper
working condition then error message will be displayed in the desktop. This
process is possible due to collective effort of microprocessor, BIOS(Basic
input output system) located inside motherboard and RAM. If all these three devices
are in proper working condition with no issue then POST process get executed. To
confirm the execution of POST, keyboard indicator and mouse blinks.
After that BIOS search the booting devices to verify
availability of operating system so that the computer gets booted. If booting device
is found then the BIOS load it to the RAM. Booting devices means all external
devices like hard drive, CD-ROM, pendrive etc.
BIOS consists of different files in order to execute its
operations. In windows, BIOS loads three files just after computer is turned
on. These files are Command.com, MS-DOS.sys, IO.sys. These all three files are
compulsion to load the operating system on our computer. So after that process
we get a prompt of user login/signup etc. Similarly for Mac, linux and other
operating system have their own files.
Let us assume we have previously installed corrupted
operating system. Then, if we want to install another operating system then at
this scenario BIOS asks user either to repair corrupted operating system or
may have fresh installation from bootable devices. We can also delete
the previous one.
So after the execution of all process without any issue we will be directed to our desktop screen. So every time we press our power button booting process gets executed. From next time whenever you start your computer do think once about the boot process and analyze it.
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