TDK has developed a new DVD coatingthat allows discs to be read by players even after they’ve been attacked by screwdrivers and permanent markers.
The coating is already being applied to some high-end plain DVDs and will be used on the new Blu-Ray 50Gb discs now in use in Japan.
The polymer also includes UV protection. Previously, Blu-ray discs needed to be housed in protective cartridges, like a cassette tape, to protect the surface because data is stored much closer to the top than in standard DVDs.

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