BD-R (Blu-ray Disc Recordable) is a high capacity optical disc format that can be written only once with audio and video data. The discs are available on the market in single or dual layers depending on a user's media needs.
A single layer BD-R holds 25GB while a dual layer holds 50GB of data. For the higher capacity, this translates to more than 9 hours of high definition video or 23 hours of standard definition video that can be recorded on a 50GB disc. The technology for even higher storage capacity is also expanding for Blu-ray. Users will see the quality and storage capacity reflected in the price of BD-R discs-up to 10 times more than a comparable DVD-R.
The construction of a BD-R is evolving with Blu-ray technology. Currently, manufacturers mainly operate with inorganic alloyed materials for the recordable layers; however testing with phase-changing technology and organic dyes like its CD and DVD predecessors is now ongoing.
A BD-R LTH is one type of write-once disc that uses organic dye in its recording layer. A recording modification to the BD-R like this could benefit to the manufacturer and its assets. A manufacturer's existing devices may only require a firmware upgrade rather than an entirely new line of Blu-ray equipment.
A BD-R's single layer disc begins with a spiral grooved polycarbonate layer. A metallic alloyed reflective layer is subsequently added followed by a zinc sulfide and silicon dioxide layer that serves as an electrical insulator or dielectric to draw excess heat away from the recordable data layer. Next there is a polycarbonate-base cover layer and a clear hard coating designed for the disc's protection.
A double layer BD-R disc employs the same construction concept as the single layer, but with some more intricate modifications. It start with a spiral grooved polycarbonate substrate plus reflective and dielectric layers like its single layer counterpart.
Next comes the disc's first recording layer followed by another electric insulation barrier, a spiral grooved adhesive layer and another dielectric layer to remove unwanted heat. A second recording layer follows along with a third dielectric layer. The dual layer disc is topped off with a polycarbonate-based cover layer and a protective clear coating.
Be sure to check out our pages on these other Blu-ray formats:
|BD-XL||Printable Blu-ray||Blu-ray 3D|