Paul
From the Vista help and support.
To burn a disk using the Mastered format.
Choose the Mastered format when you need a highly compatible disc that
will play in computers with an older version of Windows or in media devices
such as CD and DVD players that can read digital music and video files.
1.. Insert a writeable CD or DVD into your computer's CD or DVD recorder.
2.. In the dialog box that appears, click Burn files to data disc.
3.. In the Burn a Disc dialog box, type a name for this disc, and then
click Show formatting options.
4.. Click Mastered, and then click Next.
An empty disc folder opens.
5.. Open the folder that contains the files you want to burn, and then
drag the files into the empty disc folder.
6.. On the toolbar, click Burn to disc.
The selected files are copied to the disc. When the disc burning is
complete, the disc burner tray will open and you can remove the disc. You
can now use the disc in another computer or media device. This type of disc
does not need to be closed.