Reformat my DVDR so that i can use it again

As I’m cleaning today, I find out that I used lots of DVDR. Good thing my hubby didn’t see it. Hmmm! I don’t know what to do with it. Either destroy it or reformat it again so as to save bucks. Well, I guess that’s the best thing to do, to reformat all of it so that I can use it in saving some of my files as I don’t want to delete things using my recycle bin.