Technology
PFD uses a 405 nm wavelength and a numerical aperture (NA) of 0.85 for the laser, allowing 23 GB of data to be stored on one 12 cm disc – the equivalent to nearly five single-layer DVDs, and a 1x speed data transfer rate of 88 Mbit/s for reading and 72 Mbit/s for writing. After the 23GB disc was released, a dual-layer 50 GB was developed and released.
This format is sometimes confused with the Blu-ray Disc format, another optical disc format using blue-violet lasers and supported by Sony. Even the PFD's caddy and Blu-ray's bk prototype caddy (later dropped) looked very similar. Capabilities differ; 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 consumer segment to which Blu-ray is aimed.
Read more about this topic: Professional Disc
Famous quotes containing the word technology:
“One can prove or refute anything at all with words. Soon people will perfect language technology to such an extent that they’ll be proving with mathematical precision that twice two is seven.”
—Anton Pavlovich Chekhov (1860–1904)
“Technology is not an image of the world but a way of operating on reality. The nihilism of technology lies not only in the fact that it is the most perfect expression of the will to power ... but also in the fact that it lacks meaning.”
—Octavio Paz (b. 1914)