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HP Recommended

That driver (NVIDIA 15.56) worked.  After a second reboot, diskpart saw the whole disk.  I did another clean, then Disk Manager was able to make a whole-disk partition (5.45TB usable).  

 

Notes:

I didn't have to use Seagate's Discwizard; I noticed that it still gives the same error message when I try to run it the Extended Capacity Manager.

NVIDIA Control Panel still does not have listings for SATA control and other storage-related functions.

The BIOS still reported only 1.5TB for the drive after I installed the recommended NVIDIA driver.

 

Anyway, I have the space I wanted.  Thanks for the rapid and detailed help!  You guys are good.

HP Recommended

You're very welcome.

 

I was hoping that driver would work but wasn't sure.

 

In any event I knew it was your only hope.

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