Sorry, I should have been more precise.
As NetLion says, you need to include the ghost exe on a boot up floppy with a line in the autoexec.bat file 'Ghost.exe -split=700'. This will start ghost so that after storing 700 Mb it will stop and ask you to insert another medium /file.
In my case I haven't sorted out writing direct to CD so I store the images on a seperate partition on the hard drive, then I write these using Nero from within Windows. Obviously you need enough space to do this.
I have no problems storing the full 700 Mb, but by all means be a bit cautious and set the parameter to a bit less, it shouldn't make a lot of difference to your storage needs.
Don't forget you will need CD dos drivers etc on your boot up floppy for re-loading the images in the future.