Installed two 3TB drives into MyBook Studio Edition II, having problems

WD External Drives External Drives for Mac
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Featoffun,

A few things to try (in order to try):

  1. make sure the unit’s firmware is up to date. There is a Universal FW Updater avaliable, off the WD Support site. I just updated a couple units I had. Updates MUST be done when connected using USB. Updating doesn’t work if connected using Firewire or eSATA.

  2. Update your WD Drive Manager. The latest version I find on the WD Support site is version 3.1.0.14. 

OS-X’s Disk Utility should be able to undo MBR (thats will limit the supported size to 2.2TB). Try partitioning as HFS instead of MS-DOS or ExFAT. That should clear the MBR and use GUID partitioning.

I have had no problems getting 4TB drives to work in the MyBook Studio Edition II after updating. 

Enjoy!