2 SSD's connected but only 1 shows up

Jan 5, 2019
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Hi guys so I got my new build! But one problem.. So I have a samsung 860 evo 250 GB connected through sata, and a WD 250 GB M.2 SSD connected on the motherboard. but only 1 shows up and I do not know which one it is... How do I get the other one to work? or check which one i am using now
 


What motherboard?
What exact m.2 drive is this?

Often, one or more SATA ports are disabled when using an m.2 port.

Also, you really, really only want one drive connected while you do the OS install.
Really.

How to do a CLEAN installation of Windows 10
 


It's the MSI H370 Gaming plus, and a Western Digital Green 240 GB M.2. I already installed windows as I am using the computer now. I have the SSD connected on SATA 1 i think.. should I put it on SATA 2?
 


SATA 1 is disabled when using that m.2 drive in that port.

Power off
Disconnect the 860 EVO
Power up
Does it boot correctly?

If so, then reconnect the 860, in a different SATA port.
 


"missing" where?
Does it appear in Disk Management? Screencap of that, please.
 


Disk Management, not Device Manager.
It probably just needs to be Initialized, Formatted, and given a drive letter.
 


http://prntscr.com/m3gmfv
this is what I see

not showing up here

I see it in task manager too:
http://prntscr.com/m3gnws

the funny part is... it shows up on samsung magician as well
 


I cant seem to right click in disk management.. in an unallocated area