What does it mean when my WD My Passport Clicks 10 times and spins down?

[AppleNewOrleans]

Now only does it click 10 times, but it does it in a pattern.
clicks 6 times *pause* click 2 times *pause* clicks 2 times then spins down.

If you disconnect and reconnect the power, it does the exact same thing every single time. It's a 1TB WD My Passport Ultra WDBZFP001BBK-03

 

[pclab]

Usually it's a head problem, but also need to be checked inside for damage on platters.

 

[lcoughey]

It means you should stop plugging it in and take it to a professional data recovery lab who can assess it in a clean room.