Hello GopalTFA!
Is there information on the drive? What was the last occasion you successfully used it and did something happen then – power surge, accidental sudden unplugging, did you install anything while the drive connected?
The WD drive is not listed in Diskpart, as well, which could be a problem.
What kind of drive is this – external or internal? I would suggest you try using it with different SATA and power cables that work (if it's internal), and a different working USB cable (if it's external). In the second, case also, check your USB ports.
Right click on the drive in Disk Management and tell me which options does it give you?
How and is the drive shown in Device Manager? Is there an icon next to it or?
CK_WD