Question:

What is the deference between DVD-RM & DVD RM? and which one is better for keeping its contents good quality?

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actualy these 2 kind confused me, because i want to copy a family celebration & i need to know wich DVD quality is better (like sony or TDK ..etd) & wich type is better ( RM or -RM).

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  1. DVD-RW: DVD-R is short for DVD-recordable. (Note the dash before the R; it's pretty important.) Like your old friend the CD-R disc, a DVD-R disc can be recorded only once. However, the DVD-R can hold a whopping 4.7GB per side of the disc, for a total of 9.4GB of data on a double-sided disc. DVD-R is the darling of the video-editing crowd, because it allows you to record a disc that you can use in a standard DVD player. Naturally, the DVDs that you create with a DVD-R drive can't be read on a standard CD-ROM drive (but you can burn regular CD-R and CD-RW discs).

    On the rewritable side, the DVD-R disc format is called DVD-RW. These discs can also store 4.7GB, and you format them much like you format a CD-RW disc. Any DVD-ROM drive should be able to read a DVD-RW disc. Unfortunately, not all DVD players can read DVD-RWs, so if you're an up-and-coming Hollywood type that's interested in producing your own movie discs, you should stick with the DVD-R standard (which is compatible with all DVD players).

    Pick DVD-R/W if you're looking for the highest level of compatibility with all DVD-ROM drives or you're distributing discs to others.

    DVD+R/W: The other independent DVD standard, DVD+R/W, is widely available as well. This more recent format is being touted by an entirely different group of computer hardware manufacturers. DVD+R discs and DVD+RW discs can store 4.7GB, and a DVD-ROM player can read both types of discs. Again, however, you run into the same problem - DVD+R discs are compatible with most DVD players, but DVD+RW discs aren't widely supported by DVD players. Plus, DVD-R/W and DVD+R/W are incompatible.

    Pick DVD+R/W if you're looking for compatibility with the latest DVD-ROM drives or you want to spend a little less on media.  

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