formatting a blank dvd-rw disk

I have Nero6 and thought that I would be able to format any rw disk or dvd-rw disk I have. But it seems not to be so. I want to move several large files onto a dvd-rw disk and was going to use ACDsee to do so. this way I would reclaim HD space without deleting the copied files because deletimg doesn’t give back all my space, like using ACDsee does. As it moves the entire file onto the rw or dvd-rw disk and thus the file is no longer on my HD. So, I need a program that will format my dvd-rw disks. If you could send info to me at john5022@hotmail.com, I would be grateful. let me know which programs are avalible for this and if I can download then at ZDnet. Thanks