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mart namely in permanent competition and always the companies are forever trying apt be at the leading corner. The use of CD format, created in 1979,[link widoczny dla zalogowanych], already displaced the floppy-disc format because some period. The extra prevalent CD-ROM format can store 80minutes/700 MB.
Then the DVD format has chance very popular, this is able to store much more data, in the more common single layer DVD you can store 4,7 GB,[link widoczny dla zalogowanych], but double level double layer DVD can store 17 GB.
Another very profitable device is USB pen-drive, that now are largely spread worldwide. This kind of device has a quite variable storage capacity, now USB pen-drive can store even 16GB but there are also some that can store 128 Gb. On the market you can find pen drive with a lot of fashions and colors, they are less cumbersome than CD disc and they work faster in the data convey process.
The latest news on storage devices is the creation of a new kind of DVD, cried high definition DVD (HD DVD) but particularly of their straight opponent, Blu-ray disc or BD.
These two new formats vouch to make video and audio quality speed up defined and careful, to make the public live an even more matter-of-fact experience.
BD has a superior cache capacity. Thanks to a blue-colored laser, it is skillful to store up to 54 GB data, virtually 12 times more than uncomplicated single floor DVD. This capacity seems mammoth,[link widoczny dla zalogowanych], yet discs encoded in MPEG-2 movie typically limit content producers to around 2 hours of high-definition content ashore a single-layer BD-ROM. This required the creation of double layer discs (more than 50GB),[link widoczny dla zalogowanych], but likewise new more sophisticated codec, such for MPEG-4.
In July 2008, have also been announced 400GB 16 layers Blu-ray discs, but they haven’t been commercialized anyhow.
Today the fight has certainly been won by BD, because in February 2008, Toshiba, landlord of the rights on antagonist format, announced that it would no longer amplify, industry, or market HD DVD players and recorders, mainly ending the format combat.
Sony's PlayStation 3 deeded as a catalyst for Blu-ray Disc, as the PlayStation 3 accustomed a Blu-ray Disc drive as its primary message storage middle,[link widoczny dla zalogowanych], without the console,[link widoczny dla zalogowanych], purchasers should buy a characteristic BD player and probably also a new TV screen namely works in lofty definition to be able to penetrate this kind of discs.
This is not doubts an obstacle for the hunk spreading of this new technology, at least for the 1st years.
Although every film production corporation already announced that they support the BD format and they already began releasing movie using this format.
A huge doubt almost this format is whether it will be able to reserve production costs cheap and so to keep also selling prices low for terminal consumers.
Until now it seems that discs’ prices will be just about the same than usual DVD. The real problem is that until now selling of BD players are many more lower than expected. This is for consumers think that common DVD quality is already nice ample, the price of BD players is still also high and consumers don’t discern so overwhelming corrections in the video or audio quality to justify the buy of this new appliance. And until immediately none can say they are erroneous.