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I have an external HDD which I leave attached to my MacBook Pro for most of the time.

Sometimes when the system is slow to response to a UI action, I notice that the MacBook is taking time to whir the external drive back up. This is for operations where I think OS X doesn't need to use the HDD.

Is anyone able to clarify why one might see slow/delayed responses at times to some UI actions on a MacBook whilst the external drive is attached? Is there something I can do to minimize the times where Mac OS will want all drives (i.e. including external storage HDDs) up and spinning?

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perhaps you should follow this questions - seems that is nearly the identical problem. –  guenter Oct 3 '11 at 14:07
    
read through it but it doesn't really identify/solve the issue –  Greg Oct 4 '11 at 1:24
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