Even if they are not burned correctly, RW disks can be erased and started over again.
Are you using highspeed RW as some will only burn at 4x. If you use INCD program, you can format RW's and use them like a floppy.
one of the ideas for RW is if putting one edited video, for example. You can keep trying by viewing until you get it right, then transfer to R disk for posterity