Dual boot Win7 and Win10 on seperate HDD's


  1. Posts : 3
    Win7
       #1

    Dual boot Win7 and Win10 on seperate HDD's


    Hi all,
    I am sure that this has been asked a thousand times but I am new here so please bear with me.
    Th problem I have is that I loaded Win 10 on a separate HDD went to dual boot. The computer stared then it carried out a scan disk and happily deleted all the files needed to boot to win 10. I used the method of disconnecting my Win7 while installing Win10 onto the separate HDD however when I reconnected my Win7 disk and booted the computer carried out a scan disk as I said. Can someone help me please as I would like to load Win10 and then run it for a while and get used to it before moving completely over to it.
    Regards
    Chris


      My Computer

  2. Samuria's Avatar
    Posts : 6,108
    windows 10
       #2

    Welcome to the forum. For duel boot you have to install the old o/s first as it wont undersatnd the new boot files from newer o/s. The simplest way is to use free virtual box Oracle VM VirtualBox and run it as a virtual pc as it doesnt effect paritions or boot files
      My Computer


  3. Posts : 3
    Win7
    Thread Starter
       #3

    Dual Boot win7 and win10


    Samuria said:
    Welcome to the forum. For duel boot you have to install the old o/s first as it wont undersatnd the new boot files from newer o/s. The simplest way is to use free virtual box Oracle VM VirtualBox and run it as a virtual pc as it doesnt effect paritions or boot files
    Yea I did that by having win7 on one HDD and win10 on another however I couldn't dual boot as win7 wouldn't let me.
    I would like to dual boot so I can use both win10 and win7 and use them with the programs I have loaded.
      My Computer

  4. NavyLCDR's Avatar
    Posts : 15,575
    Windows 10 Pro
       #4

    When you are booted into whatever Windows will boot, the other Windows install should have a drive letter. Let's say it gets drive letter F: for example. Open a Command Prompt Admin (or "run as administrator" command prompt). Then run:

    bcdboot F:\Windows /d /addlast

    Change the path in red to the second Windows installation you want to add to the boot menu. Then restart the computer.
      My Computer


  5. Posts : 3
    Win7
    Thread Starter
       #5

    NavyLCDR said:
    When you are booted into whatever Windows will boot, the other Windows install should have a drive letter. Let's say it gets drive letter F: for example. Open a Command Prompt Admin (or "run as administrator" command prompt). Then run:

    bcdboot F:\Windows /d /addlast

    Change the path in red to the second Windows installation you want to add to the boot menu. Then restart the computer.
    Unfortunately when I loaded both HDD's and rebooted the computer the computer ran Scan Disk and deleted all the win10 Files from the HDD that it was loaded on, leaving me with only win7 disc bootable.
      My Computer

  6. NavyLCDR's Avatar
    Posts : 15,575
    Windows 10 Pro
       #6

    Chris Pear said:
    Unfortunately when I loaded both HDD's and rebooted the computer the computer ran Scan Disk and deleted all the win10 Files from the HDD that it was loaded on, leaving me with only win7 disc bootable.
    Then I guess you will have to reinstall Windows 10.
      My Computer

  7. AddRAM's Avatar
    Posts : 3,914
    Windows 10 Pro x64 20H2
       #7

    Strange, I have 7 and 10 installed on 2 drives, installed while all other drives were unplugged, and I have no issues at all.

    It ran a check disk (1 time), which is normal, not a scan disk, and it`s been running fine ever since.

    W10 is set as my default OS and I use the boot menu to choose 7 when I want to use it.

    As stated earlier, when installing 2 different operating systems on 2 separate drives, you do not have to install them in any special order, that only should be done when both drives are hooked up. And there are ways to easily fix that if the older OS is installed last.

    There may be a Fast boot option in the Bios that you may have to disable, but I tried mine disabled and then enabled and neither choice had any affect on the outcome, so I have it enabled.
    Last edited by AddRAM; 14 May 2017 at 01:25.
      My Computers

  8. AddRAM's Avatar
    Posts : 3,914
    Windows 10 Pro x64 20H2
       #8

    If you can`t come up with a fix then you could do what I did when W10 first came out.

    I kept the W7 ssd totally unplugged, then totally switched the cables when I wanted to use 7, for me it was only a matter of taking the side of the C70.

    The entire process took less then 10 seconds.

    But when I installed W10 on the Samsung M.2 that idea went out the window, as the M.2 is always plugged in. I suppose it could be disabled in the Bios, but I`m not having any issues.
      My Computers

  9. SIW2's Avatar
    Posts : 1,701
    trying to install win10
       #9

    Use the newest bootmgr, in this case replace bootmgr on your 7 hdd with a copy of bootmgr from your win10 hdd.
      My Computer


 

  Related Discussions
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 12:16.
Find Us




Windows 10 Forums