efi files of boot loader directly, and the OS kernel is loaded by the boot loader. Unlike BIOS, UEFI does not rely on boot sectors, UEFI system loads the. Set the right boot order in BIOS to start your computer. Then, the BIOS will start to find the bootable device through the boot sequence and boot loader or volume boot record (VBR) on the active primary partition, usually located in the first 512-byte sector.Īfter that, the boot loader or VBR will initial and execute the operating system boot loader files, such as, io.sys, ntldr, bootmagr, to load the operating system and its kernel, system drivers, applications, or commands required for the boot process.įinally, Just wait the file loading process, then you will see a boot screen including all the information of the computer and a prompt to enter the BIOS setup. Next, the basic input-output system(BIOS) on the read-only memory(ROM) will be loaded, and it will start to check if all the hardware is working properly, the process is also called power-on self test(POST). Let's look at the booting process in details.įirst, press the power button of a computer to start up the power supply. During the booting process, it will load some software in main memory (also called ransom access memory ) required to start Windows by hardware or firmware (MBR or UEFI) in the CPU. Computer booting means a process of starting a computer with operating system installed on it.
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