My "My Passport Essential 0730" 320GB external HDD isn't being displayed in my computer in my PC

Try running a test with DLG.

http://wdc.custhelp.com/app/answers/detail/a_id/940/session/L3RpbWUvMTM0NDI3ODg0OS9zaWQvUE5raGkxM2w%3D