BIOS only showing 1 Storage device out of 3

[saas1980]

Hi,

I installed the following 3 storage devices for my new PC. All are new.

1. Samsung 960 EVO M.2 SSD (PCIe)
2. Samsung 850 Evo
3. Toshiba HDD

I successfully installed Windows 10 Pro on the M.2 SSD, thanks to Calvin7's step by step guide which I followed to the word:
http://www.tomshardware.co.uk/answers/id-3460538/nvme-installation-asus-z270f-rog-strix.html

I booted into Windows and ran all the updates and then shut down the machine. Connected the remainder 2 storage devices and booted up into Windows again.In Device Management I allocated both of them and now all three storage units show up in Window and seem to be working fine.

But in BIOS, only the M.2 SSD is showing. Does this have something to do with CSM which I had disabled (as instructed in the link above)? Should I leave things as they are or should I be concerned?

If it helps, my PC spec: https://uk.pcpartpicker.com/user/LIVE_AMMO/saved/ZT3BmG

 

[USAFRet]

From your motherboard:
https://www.asus.com/us/ROG-Republic-Of-Gamers/ROG-STRIX-Z270E-GAMING/specifications/

"*2 The M.2_1 socket shares SATA_1 port when use M.2 SATA mode device. Adjust BIOS settings to use a SATA device.
*3 The M.2_2 socket shares SATA_56 ports when use M.2 PCIE mode device in X4 mode. Adjust BIOS settings to use SATA devices."

1 or more SATA ports are disabled, depending on which SATA port you have used.
Move your SATA drives to different ports.

 

[saas1980]

Thats odd I didn't get an email notification when your replied.

It all panned out in the end...after a couple of reboots without any hardware/connectivity changes, they were listed in BIOS.