Maybe Spotlight is indexing it?
In System Preferences, click Spotlight and Privacy.
Then you can drag that drive onto the panel to stop Spotlight indexing.

Graham



Richard Wells wrote:
> I am having a problem with my Western Digital My Book external hard  
> drive attached to my Mac Mini. It seems to be whirring away a lot of  
> the time and slowing down the whole system.
>
> I do use a partition on it for Time Machine which does its stuff every  
> hour. That is fine but it is doing it for ages in between back ups.  
> This has been happening for a while
>
> Looking at the activity monitor with iStat pro widget the CPU is  
> roughly 80% idle and the top items in Processes are all apps I am using.
>
> Any ideas about what is going on?
>
> Richard
>
> >
>
>   

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