Sunday, 11 December 2011


DVD uses 650 nm amicableness laser diode ablaze as against to 780 nm for CD. This permits a abate pit to be categorical on the media apparent compared to CDs (0.74 µm for DVD against 1.6 µm for CD), acceptance in allotment for DVD's added accumulator capacity.

In comparison, Blu-ray Disc, the almsman to the DVD format, uses a amicableness of 405 nm, and one dual-layer disc has a 50 GB accumulator capacity.

Writing speeds for DVD were 1×, that is, 1,385 kB/s (1,353 KiB/s), in the aboriginal drives and media models. More contempo models, at 18× or 20×, accept 18 or 20 times that speed. Note that for CD drives, 1× agency 153.6 kB/s (150 KiB/s), about one-ninth as swift

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