Windows7 operating system startup process explanation, general order: the BIOS, and Bootmgr – BCD MBR – Winload. Exe – kernel loading
1) after startup, BIOS to boot self-check (POST), and then choose to start from the hard drive, the loading and the MBR hard drive control over the MBR MBR (a hard disk, it is not the first sector in What a partition inside);
2) the size of 64B MBR will search, find the partition table 4 primary partition (may not have 4) activity zoning and confirm any other main partition are not activity, then applied the first active partition fan Area (Bootmgr) to memory;
3) Bootmgr looking for and reads the BCD, if have multiple boot option, will these startup options reflect on the screen, selected by the user from which initiated the start.
4) to choose from after it starts, Windows7 will load the C: \ Windows \ system32 \ winload. Exe and start kernel loaded process, the kernel loaded process longer, more complex, here Differ a speak. In this process, Microsoft Office 2010 Windows7 bootmgr and BCD stored in the reserves, and from a partition Winload. Exe starts, it began to enter into the C the kernel’s loading process execution.
MBR (Master on Record), Chinese meaning primarily Boot Record.
Hard disk 0 track first sector called MBR, its size is 512 bytes, and this area can be divided into two parts. The first part is the pre – gets on the area (the starting area), accounted for 446 bytes);
The second part is – table is area (Partition table), accounted for 66 bytes, the equivalent of a small program, the function is judgment which Partition be marked activity zoning, then go to read the points The starting area, and operation of the code in the region.
He is don’t belong to any one operating system, also cannot use operating systems provide disk operation orders to read it. But we can use ROM – BIOS INT13H provided in the no. 2 function to read this fan The content, also can use software tools DISKEDIT. The Norton8.0.exe to load BCD Configuration Data (= on startup Settings Data), BCD is the operating system startup Settings Data, Windows7 on vista or multiple operating Microsoft Office 2007 systems, which bootmgr program import BCD documents through the complete startup menu guide. Bcdedit. Available to edit BCD exe files, to adjust the boot default operating system and waiting time.