Hi Gregg,
Thanks for your response.
I have visited various online platforms and found that ‘Formatting SD card’ is one of the solutions to make it active in your X98 Plus.
All you have to do is, take a backup of your SD card and then format it by connecting it to another system.
You can also check if the card reader is disabled in BIOS settings. Restart your system and at the initial screen after a restart, find a key to press for “BIOS” or “Settings” options. You have to check whether the card reader has not been disabled in the BIOS settings.
Please acknowledge.