M.2 not recognized by B450M Pro4
Printed From: ASRock.com
Category: Technical Support
Forum Name: AMD Motherboards
Forum Description: Question about ASRock AMD motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=10997
Printed Date: 27 Jul 2025 at 5:41am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: M.2 not recognized by B450M Pro4
Posted By: RudgeMan
Subject: M.2 not recognized by B450M Pro4
Date Posted: 02 Mar 2019 at 12:51pm
Hi all,
I'm putting together a build with the Mobo listed in the title and trying to install Windows on and boot from a Crucial MX500 500GB 3D NAND SATA M.2 Type 2280SS. However the drive will not show up in BIOS nor in Windows installation as a drive to install the OS on. The activity light for the drive is on, but I can't seem to get it to show up despite trying some BIOS tweaks recommended in other posts.
I'm a noob when it comes to M.2 drives, so I apologise if I have missed something obvious, but would love to get this resolved and have the machine up and running. Any help is very appreciated!
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Replies:
Posted By: xhue
Date Posted: 02 Mar 2019 at 4:52pm
That is strange.
Here is what I recommend. Update BIOS to 2.00 and clear CMOS afterwards.
If this doesn't help, do a complete rebuild of your system from scratch. Clear CMOS once again and see what happens.
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Posted By: RudgeMan
Date Posted: 03 Mar 2019 at 4:16am
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Should have cleared this but my SSD was a SATA and I had it in the PCIE M.2 slot. Thanks for the reply!
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Posted By: xhue
Date Posted: 03 Mar 2019 at 5:46am
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If your mobo manual is to believed, the SSD should go in M.2_2, as this M.2 slot is for SATA devices. The first one is for NVMe.
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