WD Elements 1TB Disk Structure is Corrupted and Unreadable

I’m having the same problem, but I cannot run any diagnostic programs.  Windows recognizes the drive in Explorer.  But, when I try to run an Error Check, I get a message that “the disk check  cannot be performed because Windows can’t access the disk.”   I ran a rescan under Disk Management, and updated the firmware.  No dice.   So, I’m ready to try something new.   Does  Data Lifeguard Diagnostic for Windows  work on a portable drive (My Passport Essential SE)?  ARe there any other solutions?