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More About Pre Printed Media
A standard CD-R is a 1.2 mm thick disc made of polycarbonate with a 120 mm or 80 mm diameter. The 120 mm disc has a storage capacity of 74 minutes of audio or 650 MiB of data. CD-R/RWs are also available with capacities of 79 minutes, 59 seconds and 74 frames (marketed as 80 minutes) / 736,966,656 bytes (702 MiB), which they achieve by molding the disc at the tightest allowable tolerances specified in the CD-R/CD-RW standards. Most CD-Rs on the market have an 80 minute capacity. There are also 90 minute/790 MiB and 99 minute/870 MiB discs, although they are less common.
The polycarbonate disc contains a spiral groove, called the "pregroove" to guide the laser beam upon writing and reading information. The pregroove is molded into the top side of the blank media disc, where the pits and lands would be molded if it were a pressed CD. The polycarbonate disc is coated on the pregroove side with a very thin layer of organic dye. Then, on top of the dye is coated a thin, reflecting layer of silver, a silver alloy, or gold. Finally, a protective coating of a photo-polymerizable lacquer is applied on top of the metal reflector and cured with UV-light.
A blank media CD is not "empty" as the pregroove has a wobble, which helps the writing laser to stay on track and to write the data to the disc at a constant rate. Maintaining a constant rate is essential to ensure proper size and spacing of the pits and lands burned into the dye layer. As well as providing timing information, the pregroove is also contains information about the CD manufacturer, the dye used and media information (disc length etc). The pregroove is not destroyed when data is written to the CD, a point which some copy protection schemes use to distinguish copies from an original CD.
So, if you�re seeking silk screened or offset preprinted CD, DVD or BD blank recordable media, look no further! Flow Motion has your solution!
We also offer the ability to customize each disc with custom text, such as a name and or serial number.
Please contact us directly for further details and pricing.
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