External hard drive question

So I just bought GTA 5 digitally and chose to install it to my external hard drive, only 16% was being used. My internal drive is pretty much full, 99% used. However, when it began to install it said that I still needed 14 GB of space on my internal and that i had to make room. I did so everything is fine. Although this begs the question. Why, even though i chose the external with tons of available space, does it still need to install part of it to the internal? This isn't the first game to do this either. Thank you

 

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Last updated July 4, 2018 Views 2 Applies to:

my understanding is this is for reserved space for future updates and added content to come out.