LASER PARA LECTORA Y REGRABADORA DE CD
Precio: $ 18.00
Item No: 698
LASER PARA LECTORA Y REGR
No. de parte: SOH-W12F
Producto usado
Descripción
DESCRIPCION:
Enacted in 1998, Orange Book Part 2 has CD-R related information. Without deviating too much from the Red Book and Yellow Book standards, it includes standard formats for physical recording methods of Track At Once (TAO), Disk At Once (DAO), Multi-Session, Packet Writing. Identical framework to Red Book and Yellow Book, one of the added features is in front of Lead In which are PCA and PMA.
CD-R data recording principles: Blank CD surface has a thin dye layer, as recorders laser beam passes, a high-intensity laser beam burns this dye layer, making it less reflective, this process makes CD-R surface to have uneven areas with high (mirror) and low (pit) reflectivity. Changing the reflectivity of a dye layer on the CD surface does recording.
When replaying the data, a laser beam discharged from Optical Pickup will reflect upon the high area (dye layer intact, mirror) and low area (burned dye layer, pit), and the intensity of these reflections are converted into recorded digital data.
Also in CD-RW, phase change between a Crystalline state and an Amorphous state is used for media production. The recording layer is made up of a Crystalline state, in order to record a data, a high intensity laser beam from the Optical Pickup turns a Crystalline state into a liquid form then cooled to make an Amorphous state (pit).
Area with an Amorphous state does not reflect light, marking "0". Area with a Crystalline state will reflect light in a fixed direction, marking "1". When rewriting, in order to restore an Amorphous state to a Crystalline state, use of medium intensity laser power and making a Crystalline array becomes an important factor. Therefore compared to CD-R, CD-RW demands much more intricacy and precision.
CD-RW media demand characteristics:
In normal temperatures, CD-RW must carry either a Crystalline or an Amorphous characteristic.
When melting point (500-700deg.) has been surpassed, must fuse into liquid form.
Fusion/cooling process, even when repeated less than a thousand times, must sustain its qualities intact.
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