MyBook Studio Studio Edition II 2TB keeps disconnecting

WD External Drives External Drives for Mac
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Knowledge Base Answer 1697:

http://wdc.custhelp.com/app/answers/list/kw/1697

“This issue is caused by the external hard drive’s built in auto on/off functionality not correctly receiving a command from the computer system to wake from a power saver mode.” 

Knowledge Base Answer 1680:

http://wdc.custhelp.com/app/answers/list/kw/1680

“This is an technical limitation between the FireWire interfaces on the Macintosh computer and the external hard drive.” 

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Solution to the disconnect problem

As mentioned here, remove the WD Drive Manager (which is only really needed to change the RAID mode); no more disconnect problems…

Now I am happy with my Studio Edition II