Windows 10: dual boot Windows 10 with an existing Windows 7 OS & 2 partition NTFS hard drive

I would like to dual-boot windows 7 and 10 .When I try to install windows 10 on my 2nd 900 GB NTFS partition . I never get a custom install option it just wants to upgrade my 1st partition which is windows 7 OS . I am using a windows a 10 full version dvd .

:)

 

Partition size for Windows 7 dual boot?

Somewhere I read it should be 16GB... somewhere else I read it should be 10GB... what would you suggest?

Another thing, I never dual booted before so I'm very noob on this - To play all my games on Windows 7 would I have to reinstall them under the new OS? I am assuming so but thought I'd ask just in case.
If yes... then I'd be needing to make my Windows 7 partition at least 50 or 60GB... (I've got 150GB free HDD space on my desktop).

Thanks for the help *Smile

 

Dual Booting 2 x Windows 10 OS Drives (Existing Installs)


It is uneccessary to do all of the above.

1. Boot up Windows 10
2. Open Disk Management and take a note of the drive letter of the other Windows 10
3. Open Admin Command Prompt and type: bcdboot X:\Windows where X is the drive letter noted in step 2
4. Reboot, you should have a dual boot menu.

 

Move Win7 64 image from a partition NTFS to a new drive

EDIT: After reading your first post again, is there any reason that you would now need GPT? Are you just trying to move the windows install to a new disk or is there a new motherboard involved?

If you are already booting to an NTFS partition, then it makes me wonder if after copying to the new drive, the partition isn't getting marked as Active.

Following the same steps I posted above for startup repair, you can get to a command prompt and use diskpart to see if this is the case.

Code: In the command prompt: diskpart list disk select disk 0 (disk number may be different if you have other disks connected.) list partition select partition 0 (partition number number may vary, but you want to see the boot partition which is the same as your windows partition according to the screenshot on the OP) detail partition (This should have Active: Yes or No. If it says no, since we have the partition selected, you can just use the following command in diskpart) active[/quote]