Good Day AbhishekD2,
My name is Carlo, I am also using Windows 10 and a community member like you.
I can feel the urgency to get this fixed, let us work together to sort this out.
First, you need to try to connect you external hard driver using another computer for us to check if the issue is with your computer or the external hard drive itself.
If the external hard driver cannot be detected using a different computer means it is faulty, try to change the USB cable.
If it can be detected using other computer proceed with the steps below.
-Press Windows key + X
-Go to Device Manager
-Expand the Universal Serial Bus Controlers
-Look for USB 3.0 Root Hub and USB 3.0 Extensible Host Controller
-Right click and Uninstall
After restart the driver will be automaticallly installed.
Restart your computer and try to connect the the external hard drive, try a different cable or ports.
Have a wonderful day ahead and stay safe.
Sincerely,
Carlo T.