My Password Cable- how, why, where

A year ago I bought my a WD passport drive. 

She lost the cable. I thought ir was a micro-USB. So I give her a spare. It doesn’t fit.

Anyone know what’s going on here? Is this some sort of WD proprietary magic?

Where can I buy a suitable cable?

If it’s not Micro USB I think they used Mini USB before that. Maybe this will help identify it