@echo off
m c: size:[disksize`c] free:[diskfree`c]
m d: size:[disksize`d] free:[diskfree`d]
m e: size:[disksize`e] free:[diskfree`e]
m Total size [[[disksize`c]`add`[disksize`d]]`add`[disksize`e]]
m Total free [[[diskfree`c]`add`[diskfree`d]]`add`[diskfree`e]]