However, if you have any of the following models of Mac running macOS El Capitan 10.11 or later, you don’t need an external device at all because your Mac can use the internal drive to temporarily store what you need to install Windows. You’ll need this to put the ISO image on so that your Mac can install Windows. A USB flash drive with at least 5GB space.iMac Pros or Mac Pros with 128GB of memory (RAM) or more will require at least as much free hard drive storage space as your Mac has memory.This is the bare minimum you’ll need but we strongly recommend at least 128GB of free storage space as automatic Windows updates will quickly eat up that space. You’ll need 64GB or more free storage space on your Mac startup disk.Here’s what you’ll need to make sure you have before you can install Windows 10 on your Mac: What You’ll Need To Install Windows 10 on a Mac For Fee
