Blu-ray vs DVD. What’s the difference?

Data is stored on a DVD by making small burns in the disks which represent 1 and then letting some small gaps which represent 0. That’s all there is to know. Blu-rays do the same thing, but the burns are way smaller which lets you pack even more data. DVDs use a red laser and the Blu-rays use a blue laser, which allows you to create smaller cuts in the material of the disk.

This way you can store up to 50GB of data in such a Blu-ray disk.

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