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)
What are dual layer DVDs? An explanation of how dual layer DVDs work and their specifications
Bad Design (single layer DVD) | A single layer DVD has a sin… | Flickr
DVD - Wikipedia
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How to Burn a Dual Layer DVD? | Leawo Tutorial Center