Copying a DVD to another media format can be an uphill struggle if you are unfamiliar with the capabilities of each of the media formats out there. When you consider how a DVD copy software is able to interact with each type of DVD and you have a potential mess in the making. Never fear, though, because the path to understanding is a short one.
The following is an introduction to some common used DVD media formats.
DVD-R
The most commonly used of DVD media formats is the DVD-R (pronounced "dash R" rather than "minus R"), due largely to the fact that it is compatible with most DVD drives and players. It offers the typical 4.7GB of storage space that you see on most disc types, though there are discs containing multiple layers that increase the amount of recordable space available to you. For the most part, however, the DVD-R is a single-layer disc.
DVD-RW
The DVD-RW (formerly known as DVD-R/W) is a popular erasable format. Offering the usual 4.7GB of recordable space, these discs are priced higher than the regular DVD-R media formats simply because of their long-lasting value. Discs are traditionally single copy media, which makes any rewritable capabilities a valuable commodity. These media formats are often associated with disc-reading errors on DVD players due to the discs' lower reflectivity.
DVD+RW & DVD+R
The other type of rewritable disc type, DVD+RW is one of the media formats not recognized by the DVD Forum (though they do not have the power to set standards among publicly accepted media formats). Despite this hindrance, these discs are still readable in many DVD-Video players and DVD-ROM drives. The DVD+RW disc encounters the same disc-reading errors as the DVD-RW. The DVD+R differs little from the DVD-R format apart from the dye-based medium used on its reflective surface. So in some regards, it has similar compatibilities to DVD-R reading devices, though the medium may cause issues on some players or readers.
DVD-RAM
The least common among DVD media formats is the DVD-RAM disc that's used exclusively in computers due to its defect management and zoned formatting for rapid data access. Because this format is not incredibly common, this means most computer DVD drives and even DVD copy software won't recognize the disc format. If you find yourself looking for a DVD-ROM drive suited to DVD ripping or reading, be prepared to spend more than you would for DVD-R and DVD+R drives.
While there are numerous DVD formats out there available for you to use, it ultimately depends on your DVD drive. Before you consider purchasing a specific type of DVD, you should look into what media formats your drive is able to read. Not only that, but you'll want to ensure that your DVD players also recognize the formats you intend to use if you plan to play any media on your TV.
(Source from:http://www.toptenreviews.com)
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