Disconnect the drive you don't want the OS on. Then try the recovery stick or the clean install on the only drive that's left (the 256 GB one).
Some Wonderkind at Dell sent me a refurb computer laptop with the hard drives backwards...I have a 2TB OS and a 256GB storage.
So I tried Dell's recovery USB stick. It restored some settings. So I tried a clean install. Windows never gave me a choice of drives top install on.
I am feeling old...and I feel Windows is protecting me from what I want to do. Anyone have any suggestions?

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