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What's the difference between DVD-R, DVD-RAM, DVD-RW and DVD+RW?

Question:
What's the difference between DVD-R, DVD-RAM, DVD-RW and DVD+RW?

Answer:
Essentially, each is a recordable variation of the DVD format. They allow the recording of audio, video, data, etc. on DVD discs. DVD-R is a one-time recordable disc, similar to a CD-R. If used to record video, it should be playable on most DVD players. DVD-RAM, DVD-RW and DVD+RW are competing, rewriteable DVD formats. Each is backed by a group of major electronics manufacturers. Keep in mind that these three formats are incompatible with one another and the blank discs are not interchangeable. If you have a DVD recorder, be sure to buy the proper blank disc. Check your documentation, or call the manufacturer.