The format HD DVD, advanced by the group of Japanese companies toshiba, with capacity almost twice higher dvd blu-ray. The supports HD DVD convince us in the cheapness of passage from DVD to the HD DVD-ROM, since the depth of information layer in them is identical – 0.6 mm. they win from this. For the end user the cost for the burn of disks with films will be approximately identical. As the best confirmation that serves with the announcement of 51- GB HD DVD-ROM:
Toshiba HD DVD-ROM with the volume of 51 GB. Three layers and… problem with the compatability in future?
Developing new dvd, with the entire giga-byte exceeding in volume competing two-layered 50- GB disk blu-ray, Toshiba made two things. It first, reduced the size of spot burnt by laser. As a result this dvd can be written instead of 15 GB to more than – 17 GB data. In the second place, company passed to the three-layered structure disk. Three layers on 17 GB in each give the desired volume of 51 GB.
Company completely laconically illuminated the technicalities relative to new development. Here is the part of text from the description of the structure of the three-layered disk: The new disc shares the same disc structure as standard DVD and previously announced HD DVD formats: two 0.6- mm thick discs . from This phrase it is possible to understand that we are talking about multi layer disk . Two layers from one side of disk and one layer from other side. Let us note, the photographs of models 51- GB HD DVD-ROM disks reflect this version. But we will thus far consider a question about the structure of new size open.
Bilateral layout, is phenomenon in the industry usual and there are no special difficulties whatever in its adaptation for the production HD DVD-ROM .. Otherwise, if new size actually three-layered, I fear, conversations about the cheap passage from the production of two-layered DVD to three-layered HD DVD lose any meaning, since it is temporarily cheaper to purchases the new equipment for the output product format blu-ray disc. for the same money box possible problems with the compatability it is possible to add the proposal of company for reduction in the size . There is also the fear that with contemporary HD DVD player the three-layered disks will be incompatible (bilateral approach, let us note, this problem will be solve easily).
In a word, the desire Of toshiba to go around Sony, after proposing more capacious disk, to understand is possible. Only here immediately appear many questions about the expedience of this step in the stage of origin in the market dark-blue. Possibly, Toshiba feels the weakness of its position in the fight with the competing size.. Its competitor, company sony, have in their active membership prototypes even four-layer 100- GB blu-ray disks.
At the moment the anoncement of new size HD DVD-ROM has status of experimental. Company hopes to present its DVD to forum and to affirm before the end of the year.
