John Linneman on Twitter: "So it turns out not everyone is aware of the different media types used on PS2! Here's a guide! Blue disk = CD Silver = DVD (single layer)
JVC Develops World's First Single-sided, Dual Layer DVD-RW Disc Technology
4 Modi per Masterizzare un DVD Dual Layer - wikiHow
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Difference between Dual-Layer and Double-Sided DVD
What's the Difference Between Dual-Layer and Double-Sided DVD's? - MajorGeeks
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Dual Layer DVD or DVD-R DL Dual Layer Media
Verbatim DataLifePlus DVD+R dual layer Shiny Silver, 8.5GB 8X speed, 50 pack spindle - DVD Double Layer DVD+R DL - Blank DVD Media - Blank Media (Tape, Optical, etc) - Duplication.ca