Check in drive management if the partition you're using uses up the entire drive's capacity. You can access drive management by going to Start Menu > Run, then type "diskmgmt.msc" before pressing Enter.
it is a laptop hardware limitation or the BIOS does not support larger drives. there is a max limit on 120GB. my suggestion is take it off, put it into an external USB case and then plug into another PC/laptop to format into 3 x 120GB partitions. then put that drive back into your laptop. may work.