External HD keeps starting/stopping

I have a 250GB external HD connected to my iMac via firewire, im using just for time machine.
every few mins i can hear it making what sounds like a start up or shut down noise. I cant remember it
being like this before.
anyone know whats going on?

Does it happen every couple of minutes, or about every hour? What brand of External is it? Some external cases have their own power management controllers and are not controlled by the OS. You can try to either select/deselect *System Preferences->Energy Saver->Sleep (tab)->Put the hard disk(s) to sleep when possible* and see if that helps.
D.

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