Visual disk space per disk (configurable view)
Visual disk space per disk (configurable view, might be ,lots of disks) in a pie chart style to show free/used space per disk or volume. Auto refresh enabled. Set warnings for low disk space threshold (e.g. "only 5gb left on E" etc etc)
to be shown on main screen of selected server
Jean Marie THIA commented
replace the actual (1910) total disk space by a detailled view of attached disk volumes with letter. A simple bar graph as in file explorer should be enough.