Hard Drive activity monitor

is it there some kind of simple, low resources wasting, system tray kind utility to monitor HD activity and the speed of transfers in MB/s, like an internet bandwith monitor does ?

I mean, not just a LED type light like O&O drive LED, or Sysinternals Diskmon, but something with some kind of speed gauge, tooltip, or whatever showing current read/write speeds (I'm not talking about a HD benchmark utility)

is it ???
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