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  1. Joined : Feb 2015
    Posts : 15
    Windows 10 Insider Pro (Build 10240)
       17 Jun 2015 #1

    Is it safe to dual boot Windows 7 and Windows 10?


    I remember seeing some stuff about how Windows 10 would wipe all other partitions, so I'm just wondering if that's still a problem.

    And if so, can you select which partition to install on? ( I'd assume definitely so, but.. )
      My System SpecsSystem Spec


  2. Joined : Apr 2014
    Posts : 599
    Windows 10 Pro Insider Preview (14971)
       17 Jun 2015 #2

    Arcturus said: View Post
    I remember seeing some stuff about how Windows 10 would wipe all other partitions, so I'm just wondering if that's still a problem.

    And if so, can you select which partition to install on? ( I'd assume definitely so, but.. )
    Sure it's safe - I do it every day, and have been all along. When you run the Win10 installer, simply select 'Custom Install', and you can choose what partition to put it on.
      My System SpecsSystem Spec


  3. Joined : Oct 2013
    Wolves, England
    Posts : 1,634
    W7 Pro x64 | W10 IP x64 | Linux Mint VM
       17 Jun 2015 #3

    Yep, I've been dual booting for quite a while now with no issues.
      My System SpecsSystem Spec


  4. Joined : Jun 2015
    Posts : 22
    Win7 x64
       18 Jun 2015 #4

    You need to turn off Fast/Hybrid startup though to avoid filesystem corruption.
      My System SpecsSystem Spec


  5. Joined : Sep 2014
    Posts : 92
    64-bit 10240 10 Pro
       18 Jun 2015 #5

    I have Win 10 and Win 7 installed on two separate hard drives and I tried and failed to dual boot then about 4 times. I even tried to use easybcd and failed.
      My System SpecsSystem Spec

  6.    18 Jun 2015 #6

    Gary said: View Post
    I have Win 10 and Win 7 installed on two separate hard drives and I tried and failed to dual boot then about 4 times. I even tried to use easybcd and failed.
    I have Win 7 and Win 10 installed on two different SSD's and it works perfect. I always disconnect the other drives before installing any OS as in the past this caused a problem. Since I have disconnected the other drives prior to installing Win 10, it has worked perfect.
      My System SpecsSystem Spec


  7. Joined : Oct 2013
    Penns Forrest
    Posts : 3,506
    Win_8.1-Pro, Win_10.1607-Pro, Mint_17.3
       18 Jun 2015 #7

    Arcturus said: View Post
    I remember seeing some stuff about how Windows 10 would wipe all other partitions, so I'm just wondering if that's still a problem.

    And if so, can you select which partition to install on? ( I'd assume definitely so, but.. )
    Follow the steps in this tutorial and you'll be good-to-go.

    Windows 10 - Dual Boot with Windows 7 or Windows 8 - Windows 10 Forums

    Read through the tut and ask questions before beginning, it's easier to answer a question than correct a misstep.

    There have been some issues with some drives on some machines on some releases, but generally those are isolated cases. I had one back in rls 041 (or 049). It did NOT wipe my other volumes, but the System Reserve partition got fubar'd. It wasn't difficult to fix though.

    Please post a screen shot of Disk Management so members can provide advice specific to your machine.
    See: How to Post a Screenshot of Disk Management
      My System SpecsSystem Spec


  8. Joined : Sep 2014
    Posts : 92
    64-bit 10240 10 Pro
       18 Jun 2015 #8

    I did follow the instructions but I did not see what to do after this:

    If you plan on installing Windows 10 to a separate empty hard drive, then you do not need to do anything now.

    My Windows 7 Disk does not have a 350 Mb space before win t starts

    Click image for larger version. 

Name:	disk.PNG 
Views:	1214 
Size:	4.8 KB 
ID:	21824

    My Win 10 does have one.


    I have Win 7 and Win 10 installed on two different SSD's and it works perfect. I always disconnect the other drives before installing any OS as in the past this caused a problem. Since I have disconnected the other drives prior to installing Win 10, it has worked perfect.
    I had Windows 7 disconnected when I installed Windows 10 but I do not use SSD's.
      My System SpecsSystem Spec


  9. Joined : Oct 2013
    Penns Forrest
    Posts : 3,506
    Win_8.1-Pro, Win_10.1607-Pro, Mint_17.3
       18 Jun 2015 #9

    Gary said: View Post
    I did follow the instructions but I did not see what to do after this: If you plan on installing Windows 10 to a separate empty hard drive, then you do not need to do anything now.
    My Windows 7 Disk does not have a 350 Mb space before win starts
    Click image for larger version. 

Name:	disk.PNG 
Views:	1214 
Size:	4.8 KB 
ID:	21824
    Thanks Gary,

    Let's try it this way. How do you want to install Win10
    upgrade your win7
    replace your win7
    dual boot with win7

    If you're going to replace win7, backup your data and the launch an elevated Command prompt
    enter the following commands (*** are comments not part of the command set)
    diskpart
    lis vol
    sel vol 1
    *** this should be your Win7 volume - the label helps identify it.
    *** if the Win7 volume is a different number - select that number
    lis dis
    *** the disk with Win7 on it should be the selected disk (there's an asterisk on the left of the selected object)
    ***
    *** if you are certain that you have the correct disk selected - be very certain! - issue the next command to wipe the disk
    clean
    exit *** exit diskpart
    exit *** exit cmd

    Now install Win10 (custom) onto the unallocated space from external media (USB or DVD)
    Don't format the disk - let Windows do all the work.

    If you want to multi-boot I suggest that you change the disk schema first. I'm not sure that it is required, but you've had some difficulties and it might be that your active partition is also your Win7 Boot partition.

    Minitool Partition Wizard makes this relatively easy.
    Free download Magic Partition Manager Software, partition magic alternative, free partition magic, partition magic Windows 7 and server partition software - Partition Wizard Online

    Download the Free Edition (top of the list)
    -- or --
    Partition Wizard Bootable CD Free Edition (2nd from the bottom)

    I tend to use the bootable CD when working on System disks - just so the OS doesn't argue or complain.

    One you have PW ready, I'd like to see a full Disk Managment screen shot before offering other advice.
    The process will go something like this
    1) shrink C: by 450 MB
    2) slide C: to the right so that there is 450 MB free on the left
    3) setup the System Reserve volume - I'll need to revisit the specs or look at my system for reference
    4) set the new System Reserve as the active partition
    5) Run Win7 Startup Repair move the necessary files form C: to System Reserve.

    Don't try this at home

    Let me know how you want to install Win10, post the full disk management screen shot, and get PW ready.
    I'll collect some other information that will help (there's a tutorial on SevenForums that describes moving the active partition from C: or to C: )

    This is a bit of work, but it's not too difficult. Most of it is preparation and information gathering. The actual process might take less than 30 minutes.

    Then once the disk schema look right to me, you can shrink C; some more (30 GB is enough to test Win10) and install Win10 to that unallocated space.

    The key in both scenarios is unallocated space.
      My System SpecsSystem Spec


  10. Joined : Sep 2014
    Posts : 92
    64-bit 10240 10 Pro
       18 Jun 2015 #10

    Thanks slarty but at this point I really do not want to re install Windows 10. The last time I shrunk my Windows 7 disk it took a couple of hours. My wife is leaving for Arizona in the morning so I will be tied up with that. I think the problem is that I do not have the open space before the Win 7 install as you said. I also have move windows 7 back and forth to several drives using MR. I don't know if that is a problem but it could be. Thanks Again for your help.
      My System SpecsSystem Spec


 
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