You need to use a 64-bit version of Windows with the Atari VCS. We have tested Windows 10 Home Edition, but you should have no problem using other versions as long as they meet the 64-bit requirement.
Selecting external hard drives -- Windows is a large and complex OS that is prone to frequent, and fairly large updates. For optimal performance, we recommend that you use an external SSD drive that leaves a minimum of 30GB for Windows. Our minimum recommended SSD size is 64GB, leaving half the storage space for Windows and the other half for files and apps. If you plan on using PC Mode for additional PC Game libraries, you will want significantly more storage than that.
Installation time -- installing windows takes a long time. Between downloading the files, writing the installation, and then going through the multiple updates Windows will execute, expect to spend several hours watching the progress bar depending upon the speed of your computer.