For something 400 megs in size (big document!) I would consider an FTP transfer to another system. If you do manage to write to a second session on a CD with a smaller distro please let us know, it would be a handy trick to have, but even though it sounds like it just might work I sure wouldn't bet money on it. I don't have a flash drive that big either, but they do make them (as well as compact flash memory cards and related devices) and you might be able to borrow one (or a USB hard drive) long enough to pull this off. Friends with digital cameras might be a good place to start.