They do make ink jet printable, silver discs but I doubt the ones you got are printable. You can always double check with the person that sent them and ask, but they will probably tell you they are just regular discs.
so basically I would do what Dark Jedi said and just make a copy on to a printable disc. It really doesnt take long. and most burning software will do a direct disc copy reading and writing to the same drive. You'll just have to switch the source disc with a blank when the software ejects the source disc. other than that just walk away/do something else while it burns and how long it takes doesnt even matter.
-Darth Simon
ps. my mom has the R300 (which i use whenever im at my parents
) and I love the thing, but i wouldnt try putting non printable discs into it.