Dreamcast ripping tool. Rips original GD's to an SD, can also rip the BIOS and flash from your DC.
This is a self booting disk once burned to CD using the right burning software (Discjuggler, Nero, etc.).
This requires an an SD adapter for your Dreamcast. You can build one yourself or buy one from various sources such as eBay. A class 6 or better SD is required for this to work properly.