How Windows determines the dual-boot?

I want to understand the mechanisms of multiboot.  Feel free to point me to the Microsoft links that explain this.

How does he know how much OS bootable Windows are present?  Windows queries each partition at startup to see if an OS resides?  Or is a pointer added on the MBR as each OS is installed so that Windows should simply verify the MBR?

Let me complicate the qustion slightly.  Suppose that disks are involved, each with a BONE or two.  If Windows asks each partition at startup to see if an OS resides, then disks does not alter.  However, if Windows stores this information in the MBR, how it works for several discs, each with its own MBR?  Windows look each MBR it can find at startup?

Another question.  If Windows adds a pointer for each operating system on the MBR, then what happens if a BONE is removed, for example, when a partition is deleted or a diskette containing a BONE or two is physically deleted?

Initialization information is contained in the store BCD and not the MBR.  The BCD store can be found in two locations.

(1) hidden 150 MB system reserved partition.

(2) in the score where the first version of Windows that you have installed. The folder is named C:\Boot and a bootmgr file name

Whenever you install a different version of Windows (XP, Vista, Windows 7 or 8), another entry is made in the BCD store.

How to modify the BCD store: http://technet.microsoft.com/en-us/library/cc731245%28v=ws.10%29.aspx

An easier way to modify the BCD store is to install EasyBCD in the latest version of Windows you have installed.

EasyBCD (free for non-commercial use):
http://NeoSmart.NET/DL.php?id=1
http://NeoSmart.net/blog/2012/announcing-EasyBCD-2-2-Windows-8-dual-booting-and-more/

J W Stuart: http://www.pagestart.com

Tags: Windows

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