Solved I can see disk that I don't have a driver for, but I can't see other

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Interesting, in the Win 7 installer's diskpart, I can see the PCIe NVMe GPT drive, even though I don't have a driver installed for it.

But I can't see the SATA HDD, also GPT, even though I do have a driver for it [FONT=&quot]embedded in my bootable UEFI USB[/FONT].

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Maybe I should convert the unseen disk from GPT to MBR ?

Then the disk could have a boot record without messing up my UEFI Win 10 system on the NVMe drive that I can see in Win 7 even though I don't have a Win 7 driver for it.

Rationale: a known issue is that sometimes Win 7 installer doesn't want to work with a disk that doesn't have a boot record and won't install to it, even though I have a driver for it embedded in my bootable Win 7 installation USB.

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Solved by converting the unseen disk from GPT to MBR !