Files used boot process

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Electrical components of the PC are initially responsible for bringing your computer to life, as debouncing circuits take your push of the power button and trigger a switch that activates the power supply and directs current from the PSU to the motherboard and, mainly through it, to all the various components of your PC.

As each individual component receives life-giving electricity, it is powered up and brought online to its initial state.

It bridges all the various parts of your PC together, and interfaces between them as required, setting up your video display to accept basic VGA and show it on the screen, initializing the memory banks and giving your CPU access to all the hardware.

It scans the IO buses for attached hardware, and identifies and maps access to the hard disks you have connected to your PC. During the POST procedure, quick tests are conducted where possible, and errors caused by incompatible hardware, disconnected devices, or failing components are often caught. They assume control of the computer and its display, and let you do things like set up RAID arrays or configure display settings before the PC has even truly finished powering up.

This list now comes in handy, as the BIOS will load a very small program from the first hard disk to the memory and tell the CPU to execute its contents, handing off control of the computer to whatever is on the hard drive and ending its active role in loading your PC. Regardless of whether the BIOS was configured to boot from a local hard disk or from a removable USB stick, the handoff sequence is the same.

Every hard disk has an MBR, and it contains several important pieces of information. First and foremost, the MBR contains something called the partition table, which is an index of up to four partitions that exist on the same disk, a table of contents, if you will.

How small? Well, to put things in context, bytes is only 0. Given how tiny the bootstrap code section of the MBR is, the only useful purpose it can really serve is to look up another file from the disk and load it to perform the actual boot process.

On a correctly-created MBR disk, only one partition can be marked as active at a time. So the job of the bootstrap code segment in the MBR is pretty simple: look up the active partition from the partition table, and load that code into the memory for execution by the CPU as the next link in the boot chain. However, for legacy compatibility reasons, the MBR almost always loads the first sector of the active partition, meaning another only bytes.

On a disk that contains valid bootstrap code, the last two bytes of the MBR should always be 0x55 0xAA. For example, if the first boot device in the BIOS is set as the USB stick and the second is the local hard disk, if a USB stick without the correct boot signature is plugged in, the BIOS will skip it and move on to attempt to load from the local disk.

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Privacy policy. For optimal reliability and performance, use file system minifilter drivers with Filter Manager support instead of legacy file system filter drivers. Following is a summary of selected portions of the system boot process that are of interest to file system and legacy filter driver developers.

These drivers are in memory when the kernel gets control. Drivers are loaded in order of the load order groups to which they are assigned. Among file system filters, those that are assigned to one of the new file system filter driver load order groups are loaded before all other filter drivers.

Then all drivers in the "filter" load order group are loaded. So, I thought to compile these steps with focus on Windows 10 booting process for better understanding. To understand the process, firstly we need to know the files which are part of process. I will define these files here under:. BCD configuration may be altered using a bcdedit. Hope this festival brings prosperity and happiness in your life.

On this note here I close this post. See you soon with some other technical stuff. I have done B. Tech in electronics and communication stream. My job includes transition, transformation and migration activities which we perform for our esteemed clients.

Often I need to provide consultancy to my clients in migration and planning projects. I am from Chousa Buxar which has a lot of historical significance. In my free time I love to blog and play with Shreya my daughter and Tiger my pet dog.

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