How can I boot from USB 3.0 disc on a Mac Pro 2013

I am just setting up a 2013 Mac Pro with a 4TB USB 3.0 external drive. I have cloned my boot disc over to it but have problems being able to boot from the USB drive.
It shows up in the startup disc in system preferences, but when selected as the boot disc and restarted it just boots from the internal SSD. Also have checked booting and holding the ALT key to see what happens but I am just shown the SSD and Recovery disc as options to boot from.
So it appears I can not boot from a USB disc on my new Mac Pro, is there a solution to this problem?

The warranty entitles you to complimentary phone support for the first 90 days of ownership.
If you bought the product in the U.S. directly from Apple (not from a reseller), you have 14 days from the date of delivery in which to exchange or return it for a refund. In other countries, the return policy may be different. If you bought from a reseller, its return policy applies.

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Hi
First of all I have to say that its not possible to boot from the external USB device like the USB stick, USB CD/DVD drive or USB HDD.
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Usually such settings dont need to be changed or switched on 2.5 HDDs but some HDDs support an jumper which must be set in the right position. But I dont if your HDD supports this
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Here's what you'll need:
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If the drive partition/boot manager is damaged, the Reset will proceed and will ask you to select a target operating system. In my case it was Windows 8.1.
7. The next screen will be about Reset your PC telling you what's going to happen. Tap Yes > Yes, repartition the drives > Fully clean the drive > Reset.
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I recommend not installing a generic Windows 8.1 ISO that is copied straight to the USB drive using the Windows 7 USB/DVD Tool or RUFUS. They won't be compressed or the same as WIMBOOT, which will take up more storage space than stock recovery.
You could actually install another version of Windows 8.1 on the tablet, assuming you know what you are doing (ie. making a WIMBOOT image).
You could also actually install Windows Technical Preview directly, again, assuming you know what you are doing.
This is just a guide to help you try recover your tablet from a failed Technical Preview installation. I hold no responsiblities over your actions.
What I recommend is that use 8.1 for now, and wait for the official release (or at least a more stable Technical Preview release for this tablet if you can't wait that long) of Windows 10.

How can I boot from USB 3.0 disc on a Mac Pro 2013

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