Nine Movie Reviews

The next step with using  DVD [/url]is to write your own discs. As with CD, there are two kinds of formats, physical formats defining the disc material (like read-only and writeable), and logical or application formats defining how to access the information on the disc (like audio and video). The logical formats are pre-recorded DVD-Video  movies, and DVD-Audio for music.

We have become familiar with the physical formats for writing to CD discs: write-once (CD-R, or Recordable) and write multiple times (CD-RW, or Rewritable). CD-RW Rewritable discs can be written once, and then re-used by erasing and writing again.

In an interesting prescient for DVD formats, as the prices of CD-R media dropped under $1, the need for CD-RW rewritable capability has almost vanished, since it is easier to just use CD-R discs for everything instead of stocking and re-formatting a second set of CD-RW discs.

Unfortunately, this is where things get confusing, with multiple competing formats.

First, the DVD Forum actually defined three writeable physical disc formats: DVD-R for recording, DVD-RW for re-recordable / rewritable media, and DVD-RAM for rewritable data storage. The idea is that this set of formats can all be supported cost-effectively in a single "DVD-Multi" drive, along with the corresponding CD formats, providing compatibility and interchangeability across formats.

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