DesignTechnica has put together a great guide about the different DVD Formats out there. Its really confusing, DVD-RAM, DVD-ROM, DVD-R, DVD-RW,DVD+R,DVD+RW, and there will be new ones like HD-DVD-9, Blue-Ray, etc.
" The ability to hold a movie or several episodes of your favorite television with crystal clear picture and full surround sound has transformed how we enjoy our entertainment centers. Unfortunately, the specifications of this media are not as clear as the picture it provides. There are numerous, non-compatible, often conflicting formats currently in use. One of the problems here is the merger of the home theater with the computer. DVD is the central point between the two and has to accommodate both types of systems. There is also a variety of reasons for DVD drives. While the one that comes to mind first and foremost is viewing movies there is also data storage, music and editing your only multimedia endeavors. At first glance all DVDs might seem the same but they are not all created equally."
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