Hello, friends.
In this video, we're going to cover the computer boot process and then the computer boot process,
how it starts the operating system.
Now, no matter which computer you have and what operating system you're running on their computer.
The computer boot process is similar across most of the hardware platform.
So let's take a look at our computer.
So right here we have our computer with the keyboard attached to it.
And the very first thing we do whenever we need to power up our computer is that we plug it in and power
on through our socket, which provides the power or electricity to our computer.
Then that electricity actually goes through the motherboard.
And the very first thing that powers up on the motherboard is the CPU.
CPU has been there's no instructions for the CPU as to what it should do and what it should not.
Then it goes to the bias the the CPU starts and pulls instructions from the biased software.
Now, bias stands for basic input and output system.
It is a software that is actually built by the manufacturer of a company are the hardware, and it has
installed that tiny software on that little chip and that little chip is called Rahm.
Rahm stands for read only memory, read only memory.
As it's at sounds.
It's only readable.
You cannot write any thing on that chip.
Then there are certain instructions that biased software has to look for, and it goes to another chip
and that chip is also located are also right next to a close to the biased chip on the motherboard.
That chip is called CMOS.
Are complementary metal oxide semiconductor.
This Moss has the bio setting, including system, time, date as well as the hardware setting.
And this chip CMOS is actually not powered it through their regular power or to the outlet.
It is all would powered through a battery that is also located on the motherboard.
That power, Deb battery, always keep that information off that bio setting onto that chip, and it
does not lose in case it loses the computer loses his power.
OK, so the CPU reads its instructions from bios, and one of the instructions on the bios is the post.
That post stands for power on self-test.
What what it really means is bios instructions telling CPU.
Go to every device attached on the computer, go through it and make sure they are in working condition.
None of the device attached to the computer is faulty.
If there is any, it will not start or it will not go further for boarding up the computer.
Once that test is passed, then the BIOS has that setting.
Where or what is the next step I have to go to then bios has instructions to now you should go to the
disk.
Disk is located and on the disk.
On this platter, there is this block that you going to find on the disk, and that block is the first
sector on that disk.
That sector is called NBR, which stands for master boot record.
That master boot rack has the information off that operating system, whether that operating system
has Windows or Linux and so on, and from this point on the operating systems gets loaded to the RAM
or to the memory.
Now the operating procedure right from this time on starts on his own.
Whatever the instructions are, operating system has, what are the things it has to do, which program
or which application it has to start first.
It has its own set of instructions and then it's there once loaded to the memory applications, and
it goes back to the CPU to process it.
Now this entire process, when the CPU starts up, goes to bios, biases CMOS and then runs the post
and go to disk.
This entire process is called bootstrap in computer in I.T. world.
You probably going to hear this word a lot as well that what is the bootstrap process off the computer?
When you hear this word bootstrap, it means how your computer is going to power and start it up and
power on and start up the operating system.
All right, so again, as I said previously, no matter which computer you have or no matter which operating
system do you have, the basic procedure are a process to start.
A computer is everything comes are simple.
Instruction comes from the bios to the CPU, which has a factory set instructions as to how to perform
the bootstrap.