As "Bill Sharpe" says in his post; you can configure the hard disks to stop
spinning due to a period of inactivity.
I have mine set to 15 minutes, then I hear them die down, only to start up
again when they are needed (being read/written to) some time later.
This can be especially important on battery-mode laptops.
It can be configured by going to 'Control Panel' > 'Power Options' and you
will see one of the boxes labelled : 'Turn off hard disks' - set this value
to something smaller but reasonable - say 10 - 15 minutes.
Hope this is of some help to you.
==
Cheers, Tim Meddick, Peckham, London.
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