[SOLVED] M.2 Drive Split into 2 Disks and one became Hidden

Oct 12, 2020
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Hi,

I used to use a 250GB Samsung 850 EVO for my OS to boot on but after some hardware upgrades I ended up getting a Sabrent Rocket 4.0 for 1TB.

Today I noticed that the system drive (C:) is not 1TB but in fact 129GB used and 102GB free:


After checking with Disk Management, I noticed that I indeed had a 930GB drive that didn't have a drive letter so I added the F:


Disk Management, for some reason has Disk 2 and Disk 0 as separate but the C: partition is actually part of the F: partition.
What's even weirder is that the large Disk 2 is 446GB used and 483GB free and after digging in the files a bit (which at fist seem identical), I find that my entire Steam Library of games is installed in the previously invisible Disk 2 that I just now labelled as F:


It has been a while since I have run a Steam game other than DotA and am unsure what would have happened had I tried before labelling the "invisible" large partition but this is confusing.

Everything seems to work fine, free storage space seems to reflect the real amount I would have available but I'm just trying to understand how this could have happened, why did the 930GB be a separate disk from the Windows drive and where did the random 231GB Disk 0 spring up from all of the sudden?

I suspect it may have to do with the Windows migration to the new drive, since I did not reinstall a fresh copy on the new drive, I just used a migration tool to quickly transfer OS from the old Samsung SSD to the new NVME drive.

If anyone has any idea what I can do to get the drive to stop having split personality disorder, I would be very grateful.
 
Well this is embarrassing, thanks for the quick reply, I understand now.

I assumed I was booting off the NVME, is that the reason the 930 drive was hidden, because this version of Windows detects it's bootable drive and hid it to prevent accidental tampering with OS files on it?
 

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