The first thing I would do is use Explorer and take a look to see exactly what is taking up that space. Something could have gone awry in the ghosting process.
I just changed four IBM 30 GB drives to 40 giggers . . . but I did not "ghost" them. I used Powerquest's DriveCopy 4.0 with it on two bootable diskettes. It was a simple procedure that directly cloned one drive to another . . . no messing around with images.
The end result are drives that are in every way, identical to their sources. Only took 20 minutes per drive total.
Anyway, once you identify what it is that is taking up all that space, you can then know what to do about it. Could even be multiple ghost images restored.