WDBHML0030HAL - booting via usb on an iMac

I have a 2013 iMac running 10.11.1
i’ve been using carbon copy cloner to create a bootable backup
when i try to boot from this WD drive via USB, the iMac turns off 1/2 though the booting process
is this one of the WD drives that you can’t boot from?

That particular model is not currently available in the list of tested devices.

List of Mac-bootable WD external drives and how to format them to install an operation system

I’d recommend contacting WD Support about this. You can do so over the phone or via E-mail.

Contact Numbers

i’ve send WD an email. I’ve tried other usb ports and a few things on the iMac. The drive works fine when used as a mounted volume, so that do lead me to believe that this drive just can’t be booted from. Which is unfortunately why i bought it.