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January 3rd, 2021 18:00
XPS 8910, new Windows 10 install not recognizing NVMe PCIe drive
Running the latest/greatest Windows 10 setup from a USB drive, and it's not showing any connected drives (however the BIOS does see it).
XPS 8910 running the latest BIOS
UEFI mode and AHCI
1TB Adata PCIe NVMe drive sitting inside this PCIe adapter card:
https://www.amazon.com/gp/product/B07JJTVGZM
Now... when I put the drive in the onboard motherboard slot, Windows could not see it in UEFI mode, BUT I was able to make it work in Legacy mode. From what I read in Dell documentation online, you must use UEFI only when trying to boot from a PCIe card (I tried switching it to Legacy mode for grins, and Windows still could not see it).
I know others have done this, so what am I missing here??
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redxps630
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15.3K Posts
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January 3rd, 2021 19:00
When using Windows installation media, Do you find an entry in the Boot order like this: UEFI: ?
This is what I find on line:
In the UEFI, in the Boot screen at the bottom, is an option called CSM (Compatibility Support Module.) CSM is Enabled by default. Click on CSM to reveal its sub-options.
The sub-option you are looking for is called Launch Storage OpROM Policy. The default setting is Legacy Only. Change the Launch Storage OpROM Policy setting to UEFI Only.
Once these options are configured, Save and Exit the UEFI, and go right back into the UEFI.
Do NOT be worried if your PCIe SSD is not listed in the Storage Configuration screen or Boot order list. That does not matter at all.
What does matter is the entry for your Windows installation media, whether a USB flash drive (the preferred method) or optical disk, in the Boot order.
You should find an entry in the Boot order like this: UEFI: .
"Installation Media Device Name" is the name of whatever you are using as the installation media.
You will see another entry with the prefix AHCI. Do NOT select the AHCI entry. You MUST use the entry with the UEFI prefix.
redxps630
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15.3K Posts
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January 3rd, 2021 19:00
For 8910 bios, under boot tab, you may want to see a screen similar to this (last pic) where it says boot list: [UEFI] and legacy option ROM: [disabled].
https://www.dell.com/community/Desktops-General-Read-Only/XPS-8910-BIOS-0-4-2-screenshots/td-p/5081215
NOTE: PCIe NVMe SSDs will NOT be listed in the Storage Configuration screen in the UEFI. They will be shown in the System Browser tool in the UEFI.