Booting

What is Computer Booting Process & POST Process Explained Tutorial | HorizonTech4You (हिन्दी)

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• published: 13 Dec 2015
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HorizonTech4You - https://goo.gl/sI6Swo KnowledgeBase4You - https://goo.gl/AIwUuq Subscribe - https://goo.gl/sI6Swo Facebook - https://goo.gl/BgRPWj Twitter - https://goo.gl/bTSYL9 Google+ - https://goo.gl/FqtJiC HorizonTech4You Explained Videos - https://goo.gl/4ouWsF HorizonTech4You Tutorials Videos - https://goo.gl/PM3Ih0 HorizonTech4You How To Videos - https://goo.gl/2WlYzl HorizonTech4You Hindi Videos - https://goo.gl/BZVllB HorizonTech4You Computer Basics Videos - https://goo.gl/C8HEbf HorizonTech4You Storage Videos - https://goo.gl/9ZCLZi HorizonTech4You RAM Videos - https://goo.gl/ldwM3A HorizonTech4You Demonstration Videos - https://goo.gl/aZhIAv HorizonTech4You What's The Difference - https://goo.gl/PM3Ih0 [Hindi] Computer Booting Process & POST Explained in Detail Tutorial (Urdu) | HorizonTech4You In this episode of HorizonTech4You I have explained what is booting process? Why it happens & How it happens? Whenever you start your computer this booting process occurs. The moment you press the power switch on to when the desktop appears on your monitor that entire process is called The Booting Process. Booting Process consist of two major processes. First one is called "POST" which is Power On Self Test. In this process computer starts it's own internal and external every component which is connected to that particular computer to check weather that particular component is working or not? And if it doesn't then it displays it with appropriate error code on that computer's display. After completing POST successfully BIOS (BASIC INPUT OUTPT SYSTEM) finds MBR (MASTER BOOT RECORD) in connected HDDs (HARD DISK DRIVE) and if it finds MBR then it loads the per-installed OS (Operating System). This entire process is collectively called THE BOOTING PROCESS. When a computer starts up ( obviously by pressing the power button), the first thing that occurs is it send a signal to motherboard which in turn starts the power supply. After supplying the correct amount of power to each device, it send a signal called "Power OK" to BIOS which resides on motherboard. Once the BIOS receive the "Power OK" signal, it starts the booting process by first initializing a process called POST (Power On Self Test). POST first check that every device has right amount of power and then it check whether the memory is not corrupted. Then it initialize each devices and finally it gives control to BIOS for further booting. Now the final process of booting begins. For this the BIOS first find 512 bytes of image called MBR (Master Boot Record) or Bootsector from the floppy disk or hard disk which is used for booting. The priority of boot devices is set by the user in BIOS setting. The normal priority is floppy disk first, then hard disk. Once BIOS finds the bootsector it loads the image in memory and execute it. If a valid bootsector is not found, BIOS check for next drive in boot sequence until it find valid bootsector. If BIOS fails to get valid bootsector, generally it stops the execution and gives an error message "Disk boot failure". It is bootsectors responsibility to load the operating system in memory and execute it.