How to reformat DVR +R?

Please let me know how to erase or reformat a DVD +R disc.
I use ConvertXDvd to write files to DVD. But its not detecting the CD’s which are blank but was already used. Its detecting only the Fresh CD’s.
So I would like to reformat the used CD’s to make it like new.
Please let me know If I need to install any software for this.

Thanks
Binjose

I don’t think that’s possible. Isn’t that what CD-RW is for?

DVD+R is WORM media.
Write Once Read Many.