We recently bought a Sony PCV-RS220 computer for work with a dvd drive. The specifications say it is a Toshiba SD-R5002 drive. It is mostly used to back up data. Can data be appended to what is on a dvd-rw? The software that came with the computer is Veritas RecordNow. We are currently copying the entire dvd back to the hard drive, adding the new files, and burning the dvd again. This consumes a lot of time. Is this is a property of dvd-rw or the Veritas software? If it is software related what would be recommended so we can append?