Well firstly I think you need a DVD Blank not a CD Blank
by OH Smeg
In reply to
Install an OS off of an e ...
That in itself is no big deal as DVD Blanks are considerably cheaper than CD Blanks and if you use this type of Media at all you should have DVD Blanks not CD Blanks. 
As for using it from an External HDD it may or may not work depending on what your Hardware actually is but if it's going to work you need to have the Install File/s copied tot he Root of the HDD not in a Folder on the HDD as the computer will be unable to find what it is you want to install.
Col
Install an OS off of an external hard drive?
I have tried to just copy the .iso file onto the external/plug it in/switch the boot order and restart, but that leaves me looking at a black screen with a flashing white bar. Is there something I need to do to the file before attempting to boot?
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