My Book Essential 3TB will not let me create 3rd drive

I recently purchased  a My Book Essential 3TB drive.  I Deleted the total volume.  This created 2 separate areas on unallocated space.  1 wi/2+TB of unallocated space.  The other with 746.5 GB of unallocated space.  I was able to create 2 simple volumes in the 2+TB area.  However, cannot allocate/create partition in the 746.5 area.  Just allows PROPERTIIES.  Using Win7’S 64-Bit  to create partitions.  How can I created a 3 partition out of the 746.5 GB?

It’s a format issue on drives above 3T read through this post


That did the trick.  Thanks for the help