Format full capacity a WD30EZRX via USB dock station

Hi There, i cannot get Windows 7 64 bits to read the full capacity of my new 3 TB WD drive. It only reads 746 GB. I have the disc  in  a dock  station and connected to the pc via USB . Any one can help me?

Thanks in advance.

Kevedo

Hi, the link below should help.

http://community.wdc.com/t5/Desktop-Portable-Drives/3TB-Internal-Drive-as-746GB/td-p/356135