Energycore

Think I've seen it for $10 on sale, relatively often

This is awesome.
 
The Japanese actually have some really cool units in one of the ca. 1990 RTS games I play.
 
You might like that game, it's very accurate in terms of military stuff

Wargame: Red Dragon is the game you're looking for.
 
It simulates combined arms combat with units between '75 and '90, with towns and forests where infantry is king, open areas where tanks and ATGMs compete for superiority, plus planes vs AAA that can turn the tide of a battle in favor of the player with air supremacy.
 
It's really fun, as long as you don't mind the learning curve.

If you do like it, we can play together 😄

I mean, SD cards count as disks; Task Manager will also tell you about usage of stuff like USB drives and such. That's probably why

yes I know it has done external hdd but not usb drives b4