Packet writing is, in my opinion (& experience), the most unreliable method of storing data on a disk. Things may have improved recently though. It's far better to burn a multi-session disk (click here) & add/remove/update data this way.
Ashampoo Burning Studio 6 is not free. Give the *free* Ashampoo Burning Studio 2007 click here a try instead. Click on the 'Download Now' link found below (ignore the apparent expiry). G