Windows7 operating system boot process

Windows 7 operating system boot process detailed, the general order is: BIOS--"MBR--" Bootmgr --" BCD--"Winload.exe--" kernel loading.

1) After booting up, the BIOS performs a power-on self-test (POST), then chooses to boot from the hard disk, load the MBR of the hard disk and hand over the control to the MBR (MBR is the first sector of the hard disk, it Not in any one partition);

2) MBR will search the 64B size partition table, find the 4 main partitions (maybe no 4), and confirm that other main partitions are not active, then load Check the first sector of the partition (Bootmgr) to the memory;

3) Bootmgr finds and usurinates the BCD. If there are multiple startup options, these startup options will be reflected on the screen and selected by the user. From which startup item is started.

4) After booting from Windows 7, C:windowssystem32winload.exe will be loaded, and the loading process of the kernel will start. The kernel loading process is long and complicated, and there is a disagreement here.

In this process, bootmgr and BCD are stored in the reserved partition of Windows 7, and from the beginning of Winload.exe, it will enter the C drive to perform the kernel loading process.