Thought ID revisit this as previous attempt unsuccessful. Drive was lasting 30 mins on server without activity
Did some googling and tried the following
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Moved drive from direct lan into router to a switch
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Stopped Mionet
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Enabled HDD sleep
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Enabled led lights
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Disabled iTunes
To be honest I think the disabling of te iTunes might be key as it was scanning every 30 mins
So far been up for 16 hours
Will update
Fingers crossed