Z390 Pro 4 M.2 drive not showing in BIOS

Hi Vic, it's highly unlikely that your issue is BIOS version related but you can
find all the available BIOS versions for your board here:
https://www.asrock.com/MB/Intel/Z390%20Pro4/#BIOS

Before you go down the update route however try the following:

1. Make sure the M.2 drive is properly seated in it's socket.

2. Go into windows (assuming you have another boot drive installed) and check
in "Disk Management" to see if your drive is showing there.
a. Open Disk Management: Right-click the Start button (or press Windows Key + X)
and select Disk Management.
b. Initialize the Drive (if new): If the drive is brand new, an "Initialize
Disk" window will automatically pop up. Select GPT (GUID Partition Table) as it
is the modern standard, and click OK.
c. Create a Simple Volume: Look at the bottom of the window for your new disk.
It will be marked with a black bar indicating "Unallocated" space. Right-click
this unallocated space and choose New Simple Volume.
d. Specify Volume Size: The wizard will guide you; click Next. You can specify
the size in megabytes (MB) or leave it at the maximum default to use the entire
drive.
e. Assign a Drive Letter: Click Next, and assign your preferred letter (e.g.,
D, E, or F) to the drive.
f. Format the Drive: Select NTFS as the File System, leave the Allocation unit
size to Default, and give the drive a name in the "Volume label" box (e.g.,
"Media Drive"). Ensure Perform a quick format is checked.
g. Finish: Click Next and then Finish. The status will change to Formatting,
and it will then be accessible in File Explorer.

3. If it is the only M.2 drive in your system make sure you install it in the
top slot. The bottom slot shares resources with some of your SATA ports so if
you have SATA drives connected it can conflict and not show up in BIOS/the OS.

4. Under "Boot options" in your BIOS make sure CSM is set to disabled. Most NVME
drives require this setting to be disabled. CSM = Compatibility Support Module
and it exists for old, legacy hardware. Almost no one uses any hardware that
needs it anymore.

Good luck.

Author	Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic
oldretiredchief Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 04 May 2026 Status: Offline Points: 45	Post Options Post Reply Quote oldretiredchief Report Post Thanks(0) Quote Reply Topic: Z390 Pro 4 M.2 drive not showing in BIOS Posted: 8 hours 8 minutes ago at 10:25am
	Hi I have searched the net for hours trying to find a bios update for Z390 Pro 4 Thanks Chief Vic

oldretiredchief Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 04 May 2026 Status: Offline Points: 45	Post Options Post Reply Quote oldretiredchief Report Post Thanks(0) Quote Reply Posted: 8 hours 6 minutes ago at 10:27am
	Hi Am new here I have been unable to find a URL with an Z390 Pro 4 mother board bios update. I have looked for hours Thanks Vic

oldretiredchief Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 04 May 2026 Status: Offline Points: 45	Post Options Post Reply Quote oldretiredchief Report Post Thanks(0) Quote Reply Posted: 7 hours 58 minutes ago at 10:35am
	The reason I am asking this is because the Z390 Pro 4 does not see The M.2 drive i installed. Maybe there is just a setting to change and I do not have to risk bricking my MB with a flash. Thanks Vic

Xaltar Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 16 May 2015 Location: Europe Status: Offline Points: 38468	Post Options Post Reply Quote Xaltar Report Post Thanks(0) Quote Reply Posted: 4 hours 39 minutes ago at 1:54pm
	Hi Vic, it's highly unlikely that your issue is BIOS version related but you can find all the available BIOS versions for your board here: https://www.asrock.com/MB/Intel/Z390%20Pro4/#BIOS Before you go down the update route however try the following: 1. Make sure the M.2 drive is properly seated in it's socket. 2. Go into windows (assuming you have another boot drive installed) and check in "Disk Management" to see if your drive is showing there. a. Open Disk Management: Right-click the Start button (or press Windows Key + X) and select Disk Management. b. Initialize the Drive (if new): If the drive is brand new, an "Initialize Disk" window will automatically pop up. Select GPT (GUID Partition Table) as it is the modern standard, and click OK. c. Create a Simple Volume: Look at the bottom of the window for your new disk. It will be marked with a black bar indicating "Unallocated" space. Right-click this unallocated space and choose New Simple Volume. d. Specify Volume Size: The wizard will guide you; click Next. You can specify the size in megabytes (MB) or leave it at the maximum default to use the entire drive. e. Assign a Drive Letter: Click Next, and assign your preferred letter (e.g., D, E, or F) to the drive. f. Format the Drive: Select NTFS as the File System, leave the Allocation unit size to Default, and give the drive a name in the "Volume label" box (e.g., "Media Drive"). Ensure Perform a quick format is checked. g. Finish: Click Next and then Finish. The status will change to Formatting, and it will then be accessible in File Explorer. 3. If it is the only M.2 drive in your system make sure you install it in the top slot. The bottom slot shares resources with some of your SATA ports so if you have SATA drives connected it can conflict and not show up in BIOS/the OS. 4. Under "Boot options" in your BIOS make sure CSM is set to disabled. Most NVME drives require this setting to be disabled. CSM = Compatibility Support Module and it exists for old, legacy hardware. Almost no one uses any hardware that needs it anymore. Good luck.