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Windows 7: Windows 7/10 Dual Boot (BIOS, Partitions, etc.)

30 Jul 2016   #1

Windows 7 Professional 64-bit
Windows 7/10 Dual Boot (BIOS, Partitions, etc.)

Establishing points:
1. I have a Windows 10 upgrade registration ready for post-deadline.
2. I have a 256 GB SSD (my OEM Windows 7 Pro x64 is here), and a 3 TB storage drive (very much in use!) where I ultimately want to have the second OS.
3. I have USB, Microsoft USB tool, and various OS images ready.
4. I have EasyBCD ready; I have only created a second boot entry in preparation for the install and testing so far.

I have a Windows 7 install as mentioned above, and what I would like to do, broadly speaking, is to install it fresh on a partition in my storage drive, after which I would activate and upgrade that Windows 7 to Windows 10. I would have my original Windows 7 install on the primary SSD, and a Windows 10 bootable from my hard disk. In other words, I would be 'doubling up' on the same registration of W7 on a single machine, and upgrading one of those to W10.

So far the issue has been with installing Windows 7 on the hard disk from the boot media. It seems at least partly to be a GPT-MBR issue.

Windows Vista (SP1 and above, not RTM) and Windows 7 x86_64 versions support booting in x86_64 UEFI mode from GPT disk only, OR in BIOS mode from MBR/msdos disk only. They do not support IA32 (x86 32-bit) UEFI boot from GPT/MBR disk, x86_64 UEFI boot from MBR/msdos disk, or BIOS boot from GPT disk.
Now, when I boot I can enter something called "ASUS UEFI BIOS", and it seems this does not count as UEFI. As such, with my SSD (where my 64-bit W7 is) being MBR and my HDD being GPT, the Windows 7 wizard from the USB does not permit installation to any partitions on the HDD. For reference, as my existing W7 is OEM, the ISO I used to create the boot stick was Win7_Pro_SP1_English_COEM_x64.

What can I do from here? Cloning, converting, reformatting - these do not look like options as, to repeat, there is stuff on my hard disk and it is too much to back up without additional hardware/peripherals.

My System SpecsSystem Spec

 Windows 7/10 Dual Boot (BIOS, Partitions, etc.)

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