I am interested in understanding how much of my 7200 rpm hard drive's capacity is being used, because sometimes performance is very slow and choppy.
The Disk tab in Activity Monitor gives information about
Data read/sec and
Data written/sec – but is there a way to display such information relative to what it's capable of, e.g. a percentage measure.
Maybe there is a separate utility that could assist with this? Or perhaps, for technical reasons, this is not the way you measure drive performance?