1.    11 Jan 2017 #1
    Join Date : Jan 2017
    Posts : 2
    Win7x64

    EasyBCD Dual Boot management for Win10 and Win7 on separate drives


    Hi - I am thinking about transitioning from Win7 to Win10.

    I have been running Win7x64 for a very long time on my main PC. I have done a lot of installs over the years along with low level customizations. To me, it probably would be best to do a clean install of Win10 on a separate SSD and start from scratch rather than "upgrading" a clone of my Win7 drive. I have no idea what sort of latent instabilities would occur if I did a Win10 upgrade.

    I want to have both systems easily available over the months as I make my transition. There is also a possibility that I may scrap the Win10 installation and stick with Win7, since I am not a fan of the Win10 interface right now.

    If all goes well, though, I will eventually pull out the Win7 drive and stick with Win10.

    So, I want both drives to be bootable - If I pull out the Win7 drive, I want to be able to boot my Win10 drive. I also want to be able to boot the Win7 drive if I scrap the Win10 drive.

    Will EasyBCD will let me do this? I was planning on pulling my Win7 drive out temporarily, and then installing Win10 fresh on the new SSD. After that, I was going to reinstall my Win7 drive and configure EasyBCD to run off the Win7 drive.

    Will this work? Is there anything special that I would need to do for the Win10 installation or EasyBCD installation?

    Thanks,

    AzJazz
      My ComputerSystem Spec
  2.    11 Jan 2017 #2
    Join Date : Jul 2015
    Posts : 9,419
    Windows 10 Pro

    You don't even have to use EasyBCD. Once you get Windows 7 installed and booting on it's own drive (you have that now), and have Windows 10 installed and booting on it's own drive (by installing it with the Windows 7 drive disconnected), reconnect both drives and boot from whichever one you want to. The other Windows partition that you are not booted into should get a drive letter. If it doesn't, go into disk management and assign it a drive letter. Let's say it get drive F:\

    Open a command prompt with administrator privileges and run:

    bcdboot F:\Windows /d /addlast

    Change the drive letter F: to match what you need to. That will set up the dual booting on the current drive you are booting from. You can run msconfig and look at the boot tab to adjust your timeout.
      My ComputerSystem Spec
  3.    11 Jan 2017 #3
    Join Date : Dec 2016
    Posts : 49
    Windows 10

    Quote Originally Posted by AzJazz View Post
    I was planning on pulling my Win7 drive out temporarily, and then installing Win10 fresh on the new SSD. After that, I was going to reinstall my Win7 drive and configure EasyBCD to run off the Win7 drive.
    You can use the "bcdedit /export" command to create a backup file of the current system store contents.

    bcdedit /export c:\bcd.bak

    You can then use the "bcdedit /import" command if you want to restore the state of the system store.

    bcdedit /import c:\bcd.bak

    How to use BCDBoot to add or repair the boot menu on a dual-boot PC (works on both GPT and MBR disks)

    If you've installed more than one copy of Windows on a PC, you can use BCDBoot to add or repair the boot menu.

    For example: How to add Windows 7 entry to the boot menu.

    On the Windows 10 desktop, open a command prompt as administrator and type the following commands.

    diskpart
    list volume (note the volume letter where the Windows 7 is installed)
    exit

    bcdboot x:\windows (replace "x" with the volume letter of the Windows 7 partition)

    Now you should see the Windows 7 and Windows 10 entries on the dual-boot screen.

    Click image for larger version. 

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    Windows 7 style dual-boot screen (see screenshot below).

    Click image for larger version. 

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    Windows 10 style dual-boot screen (see screenshot below).

    Click image for larger version. 

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    Click image for larger version. 

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    How to restore the Windows 7 style dual-boot screen

    On the Windows 7 desktop, open a command prompt as administrator and type the following command.

    bcdboot %windir%

    How to restore the Windows 10 style dual-boot screen

    On the Windows 10 desktop, open a command prompt as administrator and type the following command.

    bcdboot %windir%

    Click image for larger version. 

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    How to fix the Windows 10 bootloader

    Look at post #24 in this thread: How do I restore w10 bootloader? dual boot with ubuntu on separate hdd
    Last edited by Avocado; 24 Jan 2017 at 10:28. Reason: more info
      My ComputerSystem Spec
  4.    13 Jan 2017 #4
    Join Date : Jan 2017
    Posts : 2
    Win7x64
    Thread Starter

    Thanks, guys! This really helped!

    Avacado's recommendation worked for me - I was running on Win7, and the commands were compatible.
      My ComputerSystem Spec
  5.    25 Sep 2017 #5
    Join Date : Sep 2017
    North Somerset
    Posts : 51
    Microsoft Windows 10 Home 64-bit/Windows 7 dual boot

    Having just installed W10 on a separate drive to my W7 stable configuration, I was initially surprised, the dual boot window did not appear at start-up until I realised this was for two OS on the same drive.
    I followed the instruction as per post #3, working out of my W10 OS, however on start up I get the W7 menu, it works fine, but why the W7 screen?
      My ComputersSystem Spec

 


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