You should have ghosted with the -split switch. If you want to break it up into 690MB chunks, type in ghost -split=690. When it ghosts your drive, it will automatically span the image in 690MB chucks. If you want to do it post imaging, use Ghost Explorer to split the image.
This process works with GHost 7.5/8.0, I'm not sure if Ghost Explorer is available in the home version.