Welcome to the TH Community, Bikram_2!
Can you please provide more details about your system configuration? I'd recommend you check if your hard drive is recognized in Device Manager or in BIOS (under SATA devices). IF it's a desktop computer, you should try connecting the HDD with a different SATA cable and to a different SATA port on your motherboard.
Keep me posted with the details!
SuperSoph_WD