Unfortunately, a full description of the differences between all of the CD and DVD formats would fill an entire book. There are many, many different types of physical media, methods for storing the data, methods for writing the data and media formats (MPEG-2, MP3, AVI, MP4, etc.)
But… since most people use just a few of the CD/DVD formats, we'll cover just those. The most common formats are generically known as CD-ROM, DVD-ROM, CD-R, CD-RW, DVD-R, DVD+R, DVD-RW, CD-Audio, DVD-Video, and the newer HD DVD and Blu-ray discs.
First off we need to define a few expressions and words.
- Burning – This is the process used to store data on the media. Which means we burn "holes" in the writable layer inside the disk.
- Session - "Period of time in which something occurs". Which translated means a file or files added in the same operation.
- Single Session – All files on disk are added in one operation.
- Multi Session – Several sessions on one disk.
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