Install xfce4-diskperf-plugin by entering the following commands in the terminal:
sudo apt update sudo apt install xfce4-diskperf-plugin
Description:
disk performance display plugin for the Xfce4 panel
The DiskPerf plugin displays disk/partition performance statistics based on the rsect/wsect data provided by the Linux kernel.
Homepage: http://goodies.xfce.org/
Version: 2.6.1-1
Section: universe/x11