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In Windows Operating System when system is powered on then power is supplied to BIOS Chip on Motherboard. BIOS checks all devices and their firmwares and looks for the MBR code on First Bootable device or bootable device found in order as configured in BIOS. MBR the first sector on bootable media directs to the Bootloader program. Bootloader program loads the Windows Kernel and then Windows OS takes control in Memory and Manages the Operating System's features.

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11y ago
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10y ago
  1. System is powered on
  2. The CMOS loads the BIOS and then runs POST
  3. Looks for the MBR on the bootable device
  4. Through the MBR the boot sector is located and the BOOTMGR is loaded
  5. BOOTMGR looks for active partition
  6. BOOTMGR reads the BCD file from the \boot directory on the active partition
  7. The BCD (boot configuration database) contains various configuration parameters( this information was previously stored in the boot.ini)
  8. BOOTMGR transfer control to the Windows Loader (winload.exe) or winresume.exe in case the system was hibernated.
  9. Winloader loads drivers that are set to start at boot and then transfers the control to the windows kernel.
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16y ago

for main parts of the boot process

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Q: What is the boot start process in windows operating system?
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