WD 2.5" spin, click then stop

[emkanapot]

Hi,

I have WD5000BEVT 2.5". I connect to PC. It spins up, clicks 1 time, stops then back to spin, clicks 3 times, stop. It repeats 3 rounds. On 4th round, it spins, clicks 1 time, stops then back to spin, clicks 4 times, stops. On 5th round onwards, it spins, clicks 4 times, stops. PC BIOS does not detect the drive. On imager, it spins, clicks 1 time, stop then back to spin, clicks 3 times, stops then enter DRDY state. After doing rescan, it spins, clicks 1 time, stop then back to spin, clicks 4 times, stops. It repeats 3 rounds then back to BSY state. Is it mechanical problem or firmware problem? and can it be fixed by serial terminal with usb to ttl adapter?

Thanks.

[pcimage]

Bad heads.