Windows 10: New install of win10 doesn't recognise older win7 drive for dual boot?

Discus and support New install of win10 doesn't recognise older win7 drive for dual boot? in Windows 10 Installation and Upgrade to solve the problem; Hi Everyone. The time is closing in where Developers/programs like Adobe PS are phasing out older O/S for new versions. I have a great Win7 machine... Discussion in 'Windows 10 Installation and Upgrade' started by farrellart, Jun 11, 2019.

  1. New install of win10 doesn't recognise older win7 drive for dual boot?


    Hi Everyone.

    The time is closing in where Developers/programs like Adobe PS are phasing out older O/S for new versions.

    I have a great Win7 machine Asus p9x79pro with 32gb ram and 6 hard-drives. In the above event, I thought it would be a good idea to have both Win7 on one drive and Win10 on another drive.

    The new Win10 (1903) installation went smoothly and is activated and up to date. I was hoping when I reboot I would have the option to choose between loading Win7 and Win10, but this is not the case. Reboot goes to Win10.....or if I press F8 I can select the Win7 drive and load that instead.

    How do I get the dual boot screen? In the bios, the Win10 drive has a UEFI text over the drive icon and the Win7 drive doesn't.

    Any ideas?

    Chris

    :)
     
    farrellart, Jun 11, 2019
    #1
  2. Rhenn_101 Win User

    Win10 clean install on new drive, dual boot w/win7 on old drive. New Win10 drive won't boot

    As per subject line above, I did clean install of Win 10 on new drive. Left Win7 on old drive. All went fine; PC boots as long as old drive is present. Boot option screen appears at boot offering choice of Win10 or 7. Works fine. BUT, when I removed old
    drive with Win7, system won't boot from new drive (CNew install of win10 doesn't recognise older win7 drive for dual boot? :). Apparently Win10 installed boot selection and/or something critical on the OLD drive. The new drive shows the Win10 logo in File Explorer (when old drive is present), and all Win10 files appear to have
    installed correctly on the new disk. But it won't boot by itself - so something is missing. (Yes, I changed the boot sequence order in the bios to look for the new drive.) But bios prompts for a bootable disk, meaning the new C: drive is "not bootable". What
    gives?

    Thanks for any help!!!
     
    Rhenn_101, Jun 11, 2019
    #2
  3. Coxwain Win User
    WIN10 /WIN7 Dual boot, WIN7 forced to upgrade to win10, now I can only boot to Primary WIN10 drive

    I have a WIN10 install on a 256 SSD (DRIVE 2)

    and had a win7 install on a 1tb WD Black HD (DRIVE 5)

    My primary boot was WIN10 (D2) and always had the option of picking wich drive to boot to on start up.

    I was recently forced to upgrade my WIN7 (D5) to WIN 10. It completed the update and I was using the opperating system on my 1 tb HD and it was working fine. Then I shut off the computer and came back about 4 days later and I couldnt boot to my second
    win10 install. (there may have been an update to the win10 before I shut it down)

    I went into boot up options and selected the 2nd win10(win7) Drive 5 as primary boot and it reverted back to the original win 10(drive 2) boot.

    What is the best way to have a dual boot win10 system and how can I change my boot up options so that I can continue to choose the boot up drive?

    WIthout a doubt the upgrade Win7 drive is still there and can be used, but there must be a boot settings that is preventing it from being accessed.

    If i am not allowed to have a dual boot WIN10/Win10 machine, can I revert back to WIN7 on the upgraded drive?

    Also, original WIN10 install was from a win8 upgrade, 2nd one is from a win7 upgrade, both fully registered versions of WINdows.

    Much apprecaited
     
    Coxwain, Jun 11, 2019
    #3
  4. New install of win10 doesn't recognise older win7 drive for dual boot?

    Dual Boot Win7 & Win10


    Here are my steps for dual booting:

    • Create a system image - store it on an external drive

    • Disconnect from the Internet and stay disconnected - part of the install asks about connecting
      - do NOT connect just yet.

    • Create the space for the 2nd OS.
      This is tricky - drives initialized as MBR can only have 4 partitions (an extended partition allows for more),
      many OEMs create 4 primary parts and you have to adjust their disk schema.

      Post a Disk Management screen shotClose the left and right panes
      The columns should also be stretched to clearly show the values, most important is the Status column
      If you have many drives, you might have to adjust the middle separator and drag the bottom edge of the window down to show the maximum information.
      Then in the View menu, pick Top and change it to disk list - no need to post a pic - just note the initialized format (MBR | GPT) and post the information.
    • Unless the 2nd OS will be used on a daily basis, keep the space to a minimum.
      Win10 + pgms on my machine takes up about 15 GB.
      I don't use Win10TP as my main OS - that's Win8.1, so data isn't a concern.
      30 - 50 GB is more than sufficient.

    • Once the space is available - take your time here - there are traps with MBR disks.
      If your disk is initialized GPT, no problem - easy! But... MBR - make sure you know what you're doing.
      Just free up enough unallocated space,
      -> do not create a partition and do not format the space.

    • When you're ready to install Win10, use a disc to avoid EFI issues.
      1. Boot to the Win10 install disc (see your machine documentation on accessing the Boot Order menu at startup)

        +editA
        These steps are probably NOT necessary, it was an afterthought when I installed Win10 the 3rd time as a dual boot to Vista. That is when I noticed the Win10 page file on my Vista boot drive - which caused Vista a bit of a problem (temporary page file created - yada, yada, yada) - I recreated the Win10 page file on it's own partition and then reallocated the Vista page file for good measure.

        At the first Win10 install screen, Press Shift+F10
        Then enter these commands in the Console window

        ^^ denotes comment, not a command
        Launch Diskpart
        lis vol

        ^^ remove the drive letters from all drives
        ^^ it's easier if you disconnect external drives that aren't needed for this exercise.

        sel vol #
        remove letter=
        ^^ specify the letter that was shown for that volume in the lis vol command
        ^^ repeat this (select volume, remove letter=) until there are no volumes with letters shown in lis vol
        lis vol
        exit
        close the Command prompt with the X in the upper right hand corner

        You should be back in the Win10 install now.-editA

      2. Answer the questions as if you were doing a clean installation (language, region, etc)

      3. Choose a custom install
        When it asks you where you want to install, choose the unallocated space
        Let the install complete, the rest should be easy.

    +editB
    When Win10 boots up, you shouldn't see any other drives - this is good.
    Configure the volumes for each OS - I suggest that you keep the two OSes separate, only expose the volumes you need to for each OS. Your Win7 should see everything except the Win10 volumes. Your Win10 should only see volumes you'll use in testing (i.e. what ever you create on the currently new and blank SSD).
    If you need data from your existing Win7 install, it's probably better to copy what you need than to expose your good data to Tech Preview code.
    -editB

    When Win7 boots up, you will see the Win10 drive - remove the letter from that drive. Keep your system separate.

    If at any step above you need some help, please ask ... you might have to wait, please wait. The hardest thing to do is wait and the easiest thing to do is "ooops, but I thought you meant...."

    I think I remembered all of the steps I took - but... I'm human too *Wink
     
    Slartybart, Jun 11, 2019
    #4
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New install of win10 doesn't recognise older win7 drive for dual boot?

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