M2 is not recognized in BIOS

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   Dear dellx37,

Greetings, this is ASRock TSD.

According to the Specification, M2_1 socket supports PCIe M.2 type device; M2_2 supports SATA type M.2 device.

Due to ADATA SU800 is a SATA type M.2 device. Hence, please install the device on M2_2 socket for verifying.

Besides, M2_2 and SATA3_3 share lanes. If either one of them is in use, the other one will be disabled.

Please also make sure there is no device on SATA3_3 port.

About detailed information, please refer to website Specification.
http://www.asrock.com/MB/AMD/AB350%20Pro4/index.asp#Specification

Thanks!

All the best,
ASRock TSD

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ASRock_TSD Members Profile Send Private Message Find Members Posts Add to Buddy List ASRock_Official Joined: 20 Mar 2015 Status: Offline Points: 8787	Post Options Post Reply Quote ASRock_TSD Report Post Thanks(0) Quote Reply Topic: M2 is not recognized in BIOS Posted: 24 Oct 2017 at 6:12pm
	Dear dellx37, Greetings, this is ASRock TSD. According to the Specification, M2_1 socket supports PCIe M.2 type device; M2_2 supports SATA type M.2 device. Due to ADATA SU800 is a SATA type M.2 device. Hence, please install the device on M2_2 socket for verifying. Besides, M2_2 and SATA3_3 share lanes. If either one of them is in use, the other one will be disabled. Please also make sure there is no device on SATA3_3 port. About detailed information, please refer to website Specification. http://www.asrock.com/MB/AMD/AB350%20Pro4/index.asp#Specification Thanks! All the best, ASRock TSD

donalgodon Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 21 Sep 2017 Status: Offline Points: 90	Post Options Post Reply Quote donalgodon Report Post Thanks(0) Quote Reply Posted: 19 Oct 2017 at 2:58pm
	The Sata 3 port on your board is shared with the M.2 channel, so if you want to use M.2, you'll need to move the Sata connector to another port (1, 3, or 4). When the BIOS detects Sata 3 is in use, it will automatically disable the M.2 slot it's shared with. I had the same issue. Moving my sata connector to another of the three ports fixed it. Edited by donalgodon - 19 Oct 2017 at 3:00pm

dellx37 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 06 Aug 2017 Status: Offline Points: 3	Post Options Post Reply Quote dellx37 Report Post Thanks(0) Quote Reply Posted: 19 Oct 2017 at 2:46pm
	Today I install adata SU800 256GB m.2 on AB350 Pro4. But M.2 is not recognized in BIOS, also not by W10 installer of course.