Hard disk space tech question, faulty?
 

I just got another Lacie d2 big disk triple interface (320GB) and after formating the disk it says there is only 152GB of free space and 152GB used space even tho its empty and no files have ever been copied to it - its brand new straight out the box.
I have 2 more of these disks and when i formatted the others they showed the full 320GB. Is this new one a bad/faulty disk??