"The disk you inserted was not readable by this computer"

I’m trying to plug in my WD external hard drive and am getting this error:

“The disk you inserted was not readable by this computer”

It does a small humming sound for a few moments and then the error pops up. It was working fine the day. Can someone help with what’s wrong with it?

Hi,

You could refer to the following link: https://support-en.wd.com/app/answers/detail/a_id/6226