Ghost image size ratio?

[KnickNut3]

Hey. I've got a new hard drive and finally have the room to ghost my OS and Apps drives. I need to know how big of a FAT32 partition to allocate to it. What's the ratio of compression on the ghost images. For example, if I had 10 GB of data on a drive, how big would the ghost image be? Thanks a lot.

 

[bhof]

I can generally get 1 gb of data into 640mb with high compression in ghost.