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Dual Layer DVD-R Media
DVD-R and DVD+R are different competing "standards" for recordable DVDs.. Both of them hold 4.37GB (or thereabouts) per disc.And DVD-R is more compatible with older devices (like DVD-ROMs and DVD players).
New technology breakthroughs allow material to be either read or recorded on one layer without affecting the other layer. When data is being recorded or read, it does so continuously from the first layer to the second without interruption.
DVD+R DL is a higher capacity (and significantly more expensive) version of the DVD+R spec. It holds roughly 2X the amount of data per disc (thereabouts 9GB/disc).
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