Types of Blue ray DVD :

BD-ROM: read-only and will be for movies, games, software and of any cylinder in which the field of preservation of the rights

BD-R: recordable format for HD video as well as data on the computer ((write once only))

BD-RE: can the amendment to the recorded data means that the property supports write back a second and third

Blue ray disk space :

25 GB single layer of single-layer

Two layers of 50 GB dual-layer

And in the future there will be spaces starting from 100 GB for single layer because it is easy to add space on the disk

Blue ray capacity to store video :

9 hours up to high-resolution format HD ((high-definition ))

On a disk with a single layer and 23-hour format called normal SD ((standard-definition ))

Blue ray technology does not support scratching :

While there was a coating placed on the disks other technologies to keep them from scratch so as not to lose data, the Blu-ray has developed a class name than it was in the past which makes the scratch is difficult and also the Blu-ray depends on the system ((error correction)) which makes it even after scratching is able to retrieve information damaged.