Windows 10: Unable to get Windows 10/ Windows 7 dual boot working

I have an OEM version of Windows 7 Pro installed on the HD of my Dell Precision desktop PC. I wanted to dual boot Windows 10 and Windows 7. I therefore bought a new Windows 7 Pro key and an SSD and installed first Windows 7, then (with difficulty; see below) Windows 10. The HD was offline throughout.

Post-install, I reconnected the HD. Windows 7 (on the HD) can see both disks but Windows 10 (on the SSD) can see only the SSD. I would like to know how to make both disks and O/S's mutually visible so that I can boot either, as desired.

Sequence of events:

1. A new SSD was attached to HDD0 and partitioned. A new instance of Windows 7 was installed in partition 1.

2. Numerous attempts were made to install Windows 10 (v.1909) with the SSD still attached to HDD0. They all failed, due apparently to a Dell RAID / Windows 10 incompatibility. Various Windows 10 folders were left behind, in both partitions of the SSD).

3. The SSD was then attached to SATA0 (the DVD drive connector) and immediately I got a Windows 10 setup prompt. W10 was successfully installed and activated using the new key W7.

Observations:

With the HD on HDD0 and the SSD on HDD1/2/3:

1. Windows 7 (OEM) boots fine. Boot Manager offers W7 or W10 but W10 will not boot.

With the HD on HDD0 and the SSD on SATA1:

1. Windows 7 Boot Manager offers W7 or W10 but W10 will not boot.
2. To get W10 to boot I have to go into BIOS options and specifically select the SSD.
3. With SSD selected at BIOS, W10 will now boot but it cannot see the HD.
4. The W10 Boot Manager contains only the W10 boot loader. The W7 one cannot be added because the HD is not visible.

I am out of ideas here and some lateral thinking would be really helpful. Could the problem arise from the different methods of installing (the new) Windows 7 and Windows 10? For W7 the SSD was on HDD0 but for Windows 10 it was on SATA1. If so, what would fix it? Any thoughts on that appreciated - thanks.Attachment 263856


:)

 

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here is a guide that should do the trick: https://www.howtogeek.com/197647/how-to-dual-boot-windows-10-with-windows-7-or-8/

Just remember if u want UEFI on Windows 10 u most have UEFI on your Windows 7 too if not u need to go change it in the bios everytime u want to go back to Windows 7.

 

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I had windows 10 installed on my old laptop, I also had a boot problem, but my HDD just stopped spinning and I was unable to load windows.
It still had the Asus factory recovery partition which I used to reinstall windows 7.
I found out that my HDD was fine in windows 7, nothing wrong with it, staying with windows 7 SP1 on this laptop and I stay with windows 8.1 on my main laptop.
No windows 10 for me!

 

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