Gain Full Capacity of My Book Studio Edition

For some reason I am only getting access to 1863GB of my 3726GB that is available.  This is new and I am just trying to set it up.

I think this is a RAID drive. If it is set at RAID 1 it mirrors the drive on second drive and has half of the combined capacity. RAID 0 treats it as one drive. Go into the WD Drive manager and change it there. You will probably loose all adat on it now and may have to reformat.