Added an external USB drive to create a backup of one of my virtual OSes. This is how:
Adding a USB controller and a USB device
To add a USB controller in a virtual machine running Windows on vSphere client:
Right-click the virtual machine and click Edit Settings.
Click Add.
Select USB Controller and click Next.
Click OK.
Then plug in USB device on host.
Then in the vSphere client to add a USB device:
Right-click the virtual machine and click Edit Settings.
Click Add.
Select USB Device and click Next.
hope this helps