Mountain Lion slowing My Book Essential?

WD External Drives External Drives for Mac
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I think it’s solved now - the disk was being put to sleep when not in use for a while  I did two things -

1.  using Smartware I went into Settings / Set Up Drive / Drive Settings /Settings / Sleep Timer and set it to ‘Never’.  (that alone didn’t work)

  1. In Mac System Preferences select Hardware/Energy Saver and unclick ‘Put hard disks to sleep when possible’ .

Seems to be working OK now.