Page 1 of 2 12 LastLast
  1.    17 Sep 2017 #1
    Join Date : Jul 2015
    Posts : 78
    Windows 7 Ultimate x64 | Windows 10 Home x64

    How to Dual Boot Multiple HDD's


    First and foremost to the Moderators if this isn't the right place I apologize. It seems right.

    Here is what I have:

    3 Internal HDD's: One is my main Windows 10 Installation and the other 2 are simple storage.

    What I want:

    Install Windows 7 to one of them and dual boot it with 10. I was hoping to avoid a total reinstall of Windows 10 by unplugging that and installing it to one of the blank HDD's I have. Then re-plugging Win10 back in and setting the main OS.

    I am pretty sure I heard of this working before and I'd like to do it. If I REALLY wanted it I could reinstall both but damn....I don't want to.

    Also my system is a UEFI type. (I am not entirely sure what that means but I know it has an impact on certain OS's)
      My ComputerSystem Spec
  2.    18 Sep 2017 #2
    Join Date : Dec 2015
    Posts : 5,841
    Windows10

    You are overcomplicating things. Simply install Windows 7 to one of blank drives, and dual boot will be setup with a menu at startup.

    If you unplug the w10 hdd, it will not be dual boot as such, and you would have to select which drive to boot from bios.

    Only minor issue is that if you install 7 after 10, you get the old style text boot menu rather than the new style graphic menu, but this is easy enough to fix using easybcd or bcdedit commands.
      My ComputerSystem Spec
  3.    18 Sep 2017 #3
    Join Date : Jul 2015
    Posts : 78
    Windows 7 Ultimate x64 | Windows 10 Home x64
    Thread Starter

    Well son of a bitch. That's what I did. I unplugged the win10 and installed 7 for two reasons:

    1) I heard installing an old OS on a separate drive/partition will override the boot loader and cause it to not load anything at all

    2) it wouldn't let me install windows with he other hdds installed for some reason.

    So windows 7 is currently installed but when I have my windows 10 HDD in it auto loads windows 10 and doesn't let me select an OS. File explorer does detect the 7 drive and I can access the files but as of this moment I have to unplug the Win 10 HDD to load 7.

    So is there anything I can do to fix this without reinstalling? If I have to reinstall I will its still a bare bones install.
    Last edited by RECONBunny; 18 Sep 2017 at 03:39.
      My ComputerSystem Spec
  4.    18 Sep 2017 #4
    Join Date : Feb 2014
    Posts : 9,333
    Windows 10 Professional

    The boot timeout may have defaulted to 0 seconds,
    Hold Shift and press Restart to check the options.

    Click image for larger version. 

Name:	000415.png 
Views:	0 
Size:	1.95 MB 
ID:	153911
      My ComputersSystem Spec
  5.    18 Sep 2017 #5
    Join Date : Jul 2015
    Posts : 9,326
    Windows 10 Pro

    Let's say in Windows 10, the Windows 7 partition is E: drive. In a Command Prompt (Admin) ("Run as Administrator" Command Prompt) run:

    bcdboot E:\Windows /d /addlast

    Change the drive in red to match what Windows 7 gets assigned in your Windows 10.

    You can change the default OS and the timeout on the boot tab of MSCONFIG.
      My ComputerSystem Spec
  6.    18 Sep 2017 #6
    Join Date : Jul 2015
    Posts : 78
    Windows 7 Ultimate x64 | Windows 10 Home x64
    Thread Starter

    Quote Originally Posted by NavyLCDR View Post
    Let's say in Windows 10, the Windows 7 partition is E: drive. In a Command Prompt (Admin) ("Run as Administrator" Command Prompt) run:

    bcdboot E:\Windows /d /addlast

    Change the drive in red to match what Windows 7 gets assigned in your Windows 10.

    You can change the default OS and the timeout on the boot tab of MSCONFIG.
    Wow! Thank you so much NavyLCDR!

    Also a shout out to everyone else here who replied
      My ComputerSystem Spec
  7.    18 Sep 2017 #7
    Join Date : Jul 2015
    Posts : 9,326
    Windows 10 Pro

    Quote Originally Posted by RECONBunny View Post
    Wow! Thank you so much NavyLCDR!

    Also a shout out to everyone else here who replied
    Amazingly easy, eh?
      My ComputerSystem Spec
  8.    18 Sep 2017 #8
    Join Date : Jul 2015
    Posts : 78
    Windows 7 Ultimate x64 | Windows 10 Home x64
    Thread Starter

    Quote Originally Posted by NavyLCDR View Post
    Amazingly easy, eh?
    It added Windows 7 to the OS list but I am going to reboot and see if it actually gives me the option before I celebrate. Will edit with the reply.
      My ComputerSystem Spec
  9.    18 Sep 2017 #9
    Join Date : Jul 2015
    Posts : 9,326
    Windows 10 Pro

    Quote Originally Posted by RECONBunny View Post
    It added Windows 7 to the OS list but I am going to reboot and see if it actually gives me the option before I celebrate. Will edit with the reply.
    Oh ye of little faith!
      My ComputerSystem Spec
  10.    19 Sep 2017 #10
    Join Date : Jul 2015
    Posts : 78
    Windows 7 Ultimate x64 | Windows 10 Home x64
    Thread Starter

    Quote Originally Posted by NavyLCDR View Post
    Oh ye of little faith!
    Now we have a major problem. When I did this it booted right into Windows 7 when it usually goes to Windows 10 first and no menu for selecting an OS. In Windows 7 I can access the W10 drive on E:/ files and all but it will not boot into Win10. When it did Windows 7 insisted on a disk check for "Consistency" for the Win10 Drive. So I let it do it's thing then it did something I've never seen before

    "Deleting extended attribute set due to the presence of reparse point in file XXXXXX" For hundreds of thousands of files.



    This went on for like 5 minutes so I got irritated and did something I probably shouldn't have done which was hit the rest button on my PC. I rebooted into Win7 again and skipped the checks. Got to my desktop and I could still access my Win10 drive. Windows 10 is also now gone from the OS list.

    When I rebooted my PC I hit F11 for the boot menu and selected the Windows 10 Drive. It said something about inserting bootable media. I didn't take a screenshot of that. I plugged in my Windows 10 USB and booted from that and selected repair errors that prevent startup. It couldn't fix the errors so I chose to Recover using a restore point. It gave me an error box saying something like "Restart and select windows version you want to repair" Even after I unplugged my Windows 7 drive it still said this."

    This all happened after I entered that command you told me to input. And yes Windows 7 happened to be E:/

    So for a super short version:

    I did that command in command prompt. Windows 7 DID list in the OS list on Windows 10. I rebooted and it went into Windows 7 immediately. Did a disk check stating "Deleting extended attribute set due to the presence of reparse point in file XXXXXX" Windows 7 can access the Windows 10 Files no problem in File Explorer. Cannot repair it with my USB Win10. Cannot boot into it or repair even with Windows 7 unplugged.
      My ComputerSystem Spec

 
Page 1 of 2 12 LastLast


Similar Threads
Thread Forum
Dual Booting
Hello, I am trying to do a dual boot with windows 10 on my main drive, then Linux on my other one. The one with Windows 10 is a SATA. And the other drive I will be putting Linux on is a IDE drive. Can someone let me know what is the best...
Installation and Upgrade
dual booting
Hi. I would like to dual booting windows 7 and windows 10. I would like install W10 on a second hd. Is that possible? My PC has an additional drive bay, which I would install W10. I really do not understand about the licensing agreement. How...
Installation and Upgrade
Dual booting windows 7 and 10
I have just upgraded windows 7 to windows 10... I've bought a new ssd to install windows 10, but it was installed over my windows 7(in the old ssd) in the process.... Articles in this forum say that you cannot dual boot windows 7 and windows 10,...
Installation and Upgrade
Solved Dual Booting with Windows 8.1
Hi, I have the ESD for Windows 10 built 10240 . I need to clean install it on a different drive and dual boot it with Windows 8.1. Can I simply boot with the 10 ISO (in UEFI boot) and clean install it on a different drive? Would I then be...
Installation and Upgrade
Dual Booting
Hi, I've decided that I would like to dual boot Windows 10 TP (I know im late to the game) Now ive done dual booting before, but I was wondering if its any different, as my system has change to include a SSD which just has windows 7 and a HDD...
Installation and Upgrade
Our Sites
Site Links
About Us
Windows 10 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 10" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd
All times are GMT -5. The time now is 21:59.
Find Us
Twitter Facebook Google+ Ten Forums iOS App Ten Forums Android App



Windows 10 Forums