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Lenovo X250 - Messed up windows installation onto M2 Cache Drive
So I was doing a clean install of Windows on my Lenovo x250. It has a 16gb SSD M.2 "Cache" drive and a standard 500gb main drive.
Unfortunately I selected the M2 drive as the installation path and formatted the other drive. So I have Windows on the smaller SSD which is now the "C" drive.
What I'd like to do is make the larger drive the C drive, install windows on that drive, and then use the smaller SSD as the cache drive like before.
I have tried diskpart and the Admin tools in the Control panel to attempt to change the drive letter on the C: drive, but it keeps giving me an error ("The Parameter is incorrect"), regardless of what drive letter I try.
I'm wondering if I simply can't change the C: drive this way, and what other options I have?