How can I boot from an external HDD that has an OS install on it?

Hello,
I have Windows 8.1 installed on my 500GB LaCie external HDD and I am trying to boot my mac from it. I haven't had any success. Thus far, I am able to get to the Startup Menu from holding the option key and Windows does show up. However, when I try to boot it, it says "No Bootable Device Found."
Keep in mind, the hard drive has Windows 8.1 installed on it. It is not a drive to install Windows through Boot Camp.
Any help would be much appreciated.

Read Starting from an external USB storage device (Intel-based Macs)

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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.
Its possible only to boot from the external USB FDD (diskette) drive
However, not the booting possibilities are clear but I think you have misunderstood the IDE#0 error message. In m opinion the IDE controller is not faulty but only the new HDD is not compatible and not recognized by BIOS.
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Mostly this error message appears if the HDD master/slave/c-sel settings are not correct.
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Furthermore the not compatible HDD size could be the reason for such error messages!
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