Is there a utility that allows me to monitor real time read / write speeds of the individual hard drives on my mac? I have 5 drives Activity monitor only gives one number, and many other apps such as menu bar stats only seem to want to show me free space, not data speeds. Can anyone point me to an app? Thanks! Edit: To be clear, i want to monitor the activity of the drives as i work, not benchmark them like with Blackmagic Speed test.