10. Blu-Ray

Blu-ray disk can store even more data than a DVD. A single layer disk can hold 25GB whilst a double layer disk can store up to 50GB.

Blu Ray diskThe look quite similar to a CD or DVD as they are the same size (form factor), however, only a dedicated Blu-ray player can play them.

They are mainly used to store high quality commercial movies. But you can buy a Blu-ray burner for a personal computer and write-able blank Blu-ray disks.

The name comes from the fact that the players use a blue laser to read and write data and this explains why DVD player cannot use them as a DVD player uses a red laser.


  • They store much more data than a DVD disk
  • They are able to store a full length high definition film
  • You need a dedicated Blu-ray player to play the disks
  • Loading a film can take minutes as so much data needs to be read


challenge see if you can find out one extra fact on this topic that we haven't already told you

Click on this link: Blu-ray technology