What are DVD-R discs? An explanation of how DVD-Rs work and their specifications
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DVD+R and DVD-R; What was that about? - YouTube
Comparison between DVD +R and DVD –R
Gold Archival Grade DVDs | Gold DVD Media
OWC 16X DVD-R Write-Once Disc with Slimline Jewel Case
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DVD-R VS DVD+R: Difference between DVD-R and DVD+R