Windows Boot Manager (BOOTMGR) is a utility that boots operating systems. If you have several operating systems, you can enable Windows Boot Manager when the computer boots and then select the target operating system.
To add more operating systems to the boot manager refer to How to Multi-Boot Two or More Versions of Windows
 |
How to set default boot entry
I am using Windows 7 as the 1st and Windows 10 as the 2nd booting option.
I prefer to use Windows 7 as the default boot manager because Windows 10 is used as software test platform. Sometimes it is necessary to reinstall Windows 10 again because some test software might corrupt the Windows 10.
Below is the example to set the default boot manager back to Windows 7
www.backupassist.com/blog/how-to-fix-boot-issues-with-bcdboot
Make sure Windows 7 is the current running operating system.
Open the command prompt and run as administrator. Run diskpart. Find out which volume belongs to Windows 7. For this case the Windows 7 volume is 'E'. Exit diskpart and type "bcdboot e:\windows" than enter. Now command prompt should show message "boot files successfully created".
docs.microsoft.com/en-us/windows-server/administration/windows-commands/bcdedit
BCDEdit – Guide for Windows Vista, 7, 8, 10
BCDEdit is a command-line tool for managing BCD stores and the primary tool for editing the boot configuration of Windows Vista and later versions of Windows. It is included with the Windows Vista distribution in the %WINDIR%\System32 folder
Administrative privileges are required to use BCDEdit to modify BCD.
Syntax
bcdedit /command [<argument1>] [<argument2>] ...
Open the command prompt and run as administrator. Type "bcdedit" without argument is to list the computer's current BCD configuration.
To delete a boot entry type "bcdedit /delete {identifier}"
How to add a new operating system to the boot manager
Insert a bootable Pendrive or DVD of the Windows version to install and restart the computer. Let it boot from the external device.
Choose all the default setting when prompted until the selection of Windows installation type. Then choose Custom - New installation and select the partition to install the Windows. Wait for the installation to be completed.
Note: After the installation the computer will use the boot manager of the latest Windows.
How to add an existing Windows to the boot manager
System Reserved partition - Space not enough
What Is the System Reserved Partition and Can You Delete It?
Windows 7, 8, and 10 create a special “System Reserved” partition when you install them on a clean disk. Windows doesn’t normally assign a drive letter to these partitions, so you’ll only see them when you use Disk Management or similar utility.
The System Reserved partition contains two important things:
- The Boot Manager and Boot Configuration Data: When your computer starts, the Windows Boot Manager reads the boot data from the Boot Configuration Data (BCD) Store. Your computer starts the boot loader off of the System Reserved partition, which in turn starts Windows from your system drive.
No comments:
Post a Comment