How can I tell what power cord I need?

WD External Drives WD Portable Drives
1

How can I tell What WD I have

I am entering The MDL: its telling me no such item.

2

Hello, you can click on the link below for all of the WD models. 

http://support.wdc.com/product/install.asp?lang=en 

For the list of power adapters, you can check the following list. 

http://wdc.custhelp.com/app/answers/detail/a_id/1378