At present, both 25GB single layer and 50GB dual layer Blu-ray discs are be compatible with the Blu-ray drives getting ready to launch. Not that long ago, TDK worked on a 100GB quad layer Blu-ray disc and more recently has been working on a 200GB prototype.
Well, apparently they have produced a Blu-ray disc 200GB using just only six layers, instead of eight as previously predicted. In order to fit 200GB over six layers, each layer’s capacity has been increased to 33GB by using bismuth peroxide as the recording medium. When the laser heats this, it oxidises to form bubbles of air, which affects the laser light in much the same way as pits on traditional CD and DVD media. So far, it is unclear if the Blu-ray drives due for launch in the near future will be able to read this media or if new hardware would need to be developed to handle this media.
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Providing the same capacity but with fewer layers means each layer must hold more data that a single-layer BD can. Indeed, TDK said it upped the capacity to 33GB – 32 per cent more than a standard BD data-carrying layer can |
With the high cost of producing Dual and Double layer recordable DVD media, chances are that quad or even six layer discs will be too expensive for the average consumer once (if) they hit the market. There is also a very good chances are that this along with 100GB quad layer Blu-ray media will need new hardware, much like how earlier single layer DVD writers cannot be upgraded to write to dual/double layer DVD recordable media.
Source: Reg Hardware
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