15 gig Harddrive only seen as 163 mb hardrive?

[VingtTrois]

Hi all just added a new (but old) harddrive to my miggy which is 15 gig but workbench is only recognising it as 163MB harddrive? i know that wb 3.1 recognises harddrives of upto 4 gig and im really not bother about the space i will lose as i plan on installing AmigaOS 3.9 straight on top of wb 3.1 so that i can get access to the other part of the harddrive.
any ideas ?

...and try this http://aminet.net/disk/misc/fixhddsize.lha