Free Programs

ImgBurn

It has several 'Modes', each one for performing a different task:

Read - Read a disc to an image file
Build - Create an image file from files on your computer or network - or you can write the files directly to a disc
Write - Write an image file to a disc
Verify - Check a disc is 100% readable. Optionally, you can also have ImgBurn compare it against a given image file to ensure the actual data is correct
Discovery - Put your drive / media to the test! Used in combination with DVDInfoPro, you can check the quality of the burns your drive is producing