Question

what is the different between blue ray disk and hard disk​

Answer 1

Just as DVD meant a 5 to 10 times increase in storage capacity compared to CD, Blu-ray Disc will increase DVD capacity by 5 to 10 times.

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Below listed are major differences between a DVD & a Blu-Ray Disc :

Parameters Blu-ray DVD

Disc thickness 1.2mm 1.2mm

Protection layer 0.1mm 0.6mm

Hard coating Yes No

Answer 2

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A standard DVD holds 4.7 gigabytes of data. This is enough to hold one movie. If that movie is longer than two hours, you need two DVDs or a double-layer DVD that can store around 9GB. On the other hand, a double-layer Blu-ray disc can hold a massive 50 GB of data.

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