Missing drive space after upgrading with Ghost 12

I used Ghost 12 to upgrade from my current 80 gig drive to a new Seagate 250 Gig drive. After the successful ghost operation, my new drive capacity is showing only 78 gigs. The rest of the 250 gigs is missing. I have looked at Disk management through XP and other disk partitioning software and all show only 78 gigs with the remaining drive drive space missing. What happened and how do I fix it.