500 Gig Passport, can't get to the data on it

Welcome to the Community.

Which operating system do you installed in your computer? Is your hard drive detected within Windows Disk Management as opposed to the Device Manger? If so, does it show a healthy partition, or is your hard drive listed as RAW? Did you change the USB cable? Did you try other computers?

Disk Management access instructions are available in the following link:

http://wdc.custhelp.com/app/answers/detail/a_id/1284/