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Asked by: Jerald Erzhenkov
home and garden home entertainingWhy do blu ray discs hold more information?
Also, how much information can a blu ray disc hold?
A dual-layer disc can hold 50GB. To ensure thatthe Blu-ray Disc format is easily extendable(future-proof) it also includes support for multi-layerdiscs, which should allow the storage capacity to beincreased to 100GB-200GB (25GB per layer) in the future simply byadding more layers to the discs.
Accordingly, why does the Blu Ray player need the blue laser?
The name "Blu-ray" refers to the bluelaser (actually a violet laser) used to read thedisc, which allows information to be stored at a greaterdensity than is possible with the longer-wavelength redlaser used for DVDs.
The reason that a Blu-ray Discplayer can play DVDs is that manufacturers decidedthat all Blu-ray Disc players included both blue andred lasers so that they could play both Blu-ray Discsand DVDs. When you place a DVD into aBlu-ray Disc player, it activates the redlaser assembly so that the DVD can be read.