Solved Wow! Serious limitation of Win 7 installer's diskpart

[Muffin Top]

This is a follow-up to my multi-part series on attempting to install Win 7 on an Optiplex 7050 tower with USB 2. I removed NVMe drive and attempted to install on Dell's HDD. I managed to annoy the forum with my slipstream questions, because the guy who provided a guide in GitHub was able to get Win 7 working on a 7040.


Consensus over in NTLite is that it should be working now, so I finally did some hardware troubleshooting that theoretically might have been done a couple days ago, except I'm new, and I did this inefficiently on the software side.


So today I finally ran the Win 7 installer's version of diskpart, and it can't see the HDD. I re-installed the NVMe, and Win 10 has no problem seeing the HDD in both Disk Management and diskpart.


The history of this HDD was I cleaned it in Disk Management and initialized it as a GPT disk, as it now appears in Win 10's diskpart.


Internet browsing tells me [FONT=&quot]Windows setup can chuck a fit when it discovers a drive with an invalid MBR/boot sector and won't install to it. So I'm thinking it might actually make a difference for installation if I format the HDD and try Win 7 installation again.[/FONT]

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Solved by converting the unseen disk from GPT to MBR !