Why is there a Yellow Mark shown for Base System Device?
Written by Support Team
Updated at February 17th, 2023
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While using the SSD7140/SSD7180/SSD7184/RU1488C NVMe RAID controller with a Windows operating system, a “Yellow Mark” error is shown under Windows Device Manager for a “Base System Device”:
SSD7140 / SSD7180 / SSD7184 / RU1488C :
1. This “Yellow Mark” error message is associated with an unused feature of SSD7140, SSD7180, RU1488C, and SSD7184, NVMe RAID Controllers’ PCIe Switch chipset. It can be safely ignored, and will not interfere with the controller’s performance or functionality. For more information, please see section “3. Notes about the Yellow Mark entry”.
If you wish to remove the yellow marked entries, please install the following PLX driver.
2. Installing the PLX Driver: Download
1）Remove all NVMe SSD’s from the SSD7000 series controller, and install it into a PCIe slot.
2）Power on the system and boot Windows.
3）Locate the PLX driver package and extract this to a directory of your choice.
4）Open Device Manager and expand Other Devices.
5）Right-click on one of the Base system device entries, and select Update driver:
6）Select Browse my computer for drivers, and browse to the folder that contains the extracted PLX download.
7） Click the PLX_Windows_Driver_xxx option (as shown below), and click OK:
8）Select Next:
9）When the pop-up window appears, select Install:
10）After the installation process is complete, click Close:
11）Repeat steps 5 through 10 for the remaining Base system device entries. Once complete, you should see the following entries:
12）You can check the properties for each entry – it should report that “The device is working properly”.
3. Notes about the Yellow Mark entry:
Windows Device Manger distinguishes the types of device according to ClassGUID. The PLX driver claims to report the device ClassGUID={4d36e97e-e325-11ce-bfc1-08002be10318}. This ClassGUID is categorized under Other Devices, according to the instructions given by Microsoft. So even if the controller driver is successfully installed, it will still display the yellow mark entry under Other Devices, due to how Windows classifies the PLX component.
Regarding the 
shown above; this signifies “Other Device”.
Official Microsoft explanation link:
The ClassGuid of the PLX driver is consistent with the instructions provided by Microsoft.