Blu-ray discs differ from standard-definition discs in the way they are produced and how they store data. Standard definition DVDs are two clear polycarbonate discs, each 0.6mm thick, sandwiched together with the data recorded on a very thin metal substrate in between, explains Adrienne Downey, senior analyst at research firm Semico.Netflix Subscribers See Red Over Cracked Blu-ray Discs | Gadget Lab from Wired.com
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