I a having the same problem with my 1 TB Western Digital My Passport. It doesn't get detected with my Windows 7, 64 bit or Ubuntu 12.04. Here is how it shows on Computer Management
If I try to initialize it,
this window keeps popping
I tried Western Digital Data LifeGuard Diagnostics. It does show up but with 0B capacity.
I also tried Windows Disk Partition withe same result as Rashmanadon. I don't have much important data it. Is there any way to format and recover it?