I have a western digital ide caviar WD2500 and 250 gig hard drive. when i put it in the pc the bios reads it as a 250 gig drive, put when i try to partition it it says its only 141 gig does n e body know how or why i can not access the full 250 gig. There are no jumpers only master or slave. Any help would be most appreciated, or is the drive duff ?