Blue Ray Dics
The Amazing Storage Capacity Of Blue Ray Discs
Blue ray Disc is the name of the next generation optical disc format. This new format offers over 5 times more storage capacity than DVDs. A single-layer disc can hold up to 25GB, and a dual-layer disc can hold up to 50 GB. The result of this extra storage capacity results in amazing HD experience, and blue ray dics can hold and play back large quantities of high definition video, audio, photos, and data.
Current technologies such as the DVD, DVD-R, DVD-RW, and the DVD-RAM all rely on a red laser to read and write the data that is on them. The new format uses a blue-violet laser to read and write the data. Even though different lasers are used to read the data, blue ray products can be made backwards compatible with CDs and DVDs by using a BD/DVD/CD compatible optical pickup unit. The major benefit of using the blue laser is that is has a shorter wavelength than the red laser. This makes it possible to focus the laser spot with incredible precision, and allows the data on the disc to be packed more tightly and stored into less space.
Blue ray dics also offer a new level of interactivity, by allowing the user to connect to the internet and instantly download subtitles and other movie features. Blue ray technology also allows you to record one program while you are watching another on the disc, create play lists, edit or reorder programs recorded on the disc, instantly skip to any spot on the disc, record high definition television, access the web to download subtitles and other movie features.
Blue ray dics are about the same thickness as a DVD, but the two types store their information and data very differently. The DVD places the data between two polycarbonate layers, but this has caused problems when the surface of the DVD is not exactly flat and the laser can’t retrieve the data in between the layers. The blue ray disc places its data on top of a 1.1 mm thick polycarbonate layer. By having the data on top, it prevents any readability problems with the laser. Because the data is close to the surface, a hard coating is placed on the outsides of the disc in order to protect it from scratches and fingerprints. The design of the blue ray discs have saved on manufacturing costs. Blue ray dics do the injection molding process on only one disc, reducing the cost, and that in turn balances out the added cost of having to add a protective top layer to the disc. The end price of production is no more than the price of a regular DVD. |