What's the Difference Between Dual-Layer and Double-Sided DVD's? - MajorGeeks
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Double sided dvd each side has one half of It on it : r/mildlyinteresting
Best Buy: Upside Down [2 Discs] [3D] [Blu-ray/DVD] [Blu-ray/Blu-ray 3D/DVD] [2013]
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The Upside Down Show Season 1 Nickelodeon TV Series DVD for sale online | eBay
What are dual layer DVDs? An explanation of how dual layer DVDs work and their specifications
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Double-sided DVDs – Obsoletech
Back in like the early part of the 00's DVD's came double sided for a time being with the “Full Screen” edit for traditional TV's and Widescreen for the newer modern models. :
Fresh Spin - Game disc, CD, DVD, CD-ROM disc care & repair - Disc Technology
DVD - Wikipedia
Double-sided DVDs : r/nostalgia
Double-sided DVD read error (details in comments) : r/dvdcollection
Double sided DVD's - Are they prone to problems? - Media Discussion - MLP Forums
Allsop CD and DVD FastWipes, lint-free wipes for cleaning DVD, CD, PS1, PS2, XBOX & XBOX 360 Discs
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Dual Layer DVD or DVD-R DL Dual Layer Media
What are dual layer DVDs? An explanation of how dual layer DVDs work and their specifications