Is that 4 Gig of data, or a 4 Gig partition? Either way compression software used when making an image, i.e. Norton Ghost, will considerably reduce the image file size. Alternatively Ghost allows you to split the image file into chunks so that it can fit onto, say, CD-Rs. You should be able to choose the size of the chunks. If necessary build the image onto another hard drive and then copy it to the DVD or CD-Rs.