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m Bot: Corrección del plural de las siglas. http://buscon.rae.es/dpdI/SrvltGUIBusDPD?lema=Sigla#3 - CD (v1.09) |
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==Tecnología==
PFD uses a 405 [[nanometer|nm]] wavelength and a [[numerical aperture]] (NA) of 0.85 for the laser, allowing 23 [[gigabyte|GB]] of data to be stored on one 12 [[Centimetre|cm]] disc – the equivalent to nearly five single-layer
Confusingly, this sounds very similar to the [[Blu-ray Disc]] format, another optical disc format using blue-violet lasers which is also supported by Sony. Even the PFD's caddy and Blu-ray's bk prototype caddy (later it was dropped) looked very similar. The only apparent difference is that single-layer PFD discs have a capacity of 23 GB whereas Blu-rays can store 25 GB. However, Blu-ray Discs currently allows a 2x data transfer rate of 72 Mbit/s – lower than PFD. This is because PFD discs use much higher quality media and drives use higher quality components, making them prohibitively expensive for the average consumer segment to which Blu-ray Discs are aimed.
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