Question Windows 10 Diminue C: Volume

[moisesvnn]

Hello,
So, i want to create a partition in my computer to actually use it as a bootable drive(for installing Windows), but the question is: my C: have 526,86Gb of storage space, but when i try to diminue it, the screens that pop-up shows that it have 539500MB. How many mb I must diminue to have the 8gb space? It's exactly 8000MB or should I convert or do something?

 

[moisesvnn]

okay, after doing some math using the cortana seach bar, now I know that i need to use how much gb you want * 1024mb, with that the problem is solved.