Show drive GB used

[vidw]

The status bar shows the amount of free disk space (345.34 GB). Is there a way to show the amount of space used?
If I hover over the drive the tooltip shows the free disk space and total disk space. Maybe the used space should be here since the free space is already in the status bar?

[Forez]

You should get acquainted with options available at

Tools > Settings > View > Status Bar > Content > Define Details > Hint Pattern