CD copy protection schemes CD player manufacturers Optical disc authoring software. However, the polycarbonate is of very little value and the quantity of precious metals is so small that it is not profitable to recover them. Note that the Yellow Book standard for CD-ROM only specifies a high-level data format and refers to the Red Book for all physical format and low-level code details, such as track pitch, linear bit density, and bitstream encoding. The engineering margin that was reserved for manufacturing tolerance has been used for data capacity instead, leaving no tolerance for manufacturing; for these discs to be truly compliant with the Orange Book standard, the manufacturing process must be perfect. Real-life not accelerated aging tests have revealed that some CD-Rs degrade quickly even if stored normally.

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Manufacturers typically use a sequence of two, three or four numbers to express the maximum writing and reading speeds of a recorder. Then, on top of the dye is coated a thin, reflecting layer of silvera silver alloyor gold. However, the reflected light is modulated not by pits, but by the alternating regions of heated and unaltered dye.

For a discussion of this topic, see the cd The pregroove is not destroyed when the data are written to the CD-R, a point which some copy protection schemes use to distinguish copies from an original CD. Once the buffer again accumulates sufficient data the recorder resumes writing precisely where it left off.

What is buffer underrun? Track this discussion and email me when there are updates. Unsourced material may be challenged and removed. What is buffer underrun protection? Furthermore, correct power adqpi of the laser in the writer, as well as correct timing of the laser pulses, stable disc speed, and so on, is critical to not only the immediate readability but the longevity of the recorded disc, so for archiving it is important to have not only a high quality disc but a high quality writer.


DVD-RW is not supported. The drives listed in this section have been tested with Ghost and proven to function correctly.

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Manufacturers have estimated the longevity of gold-based CD-Rs to be as high as years. However, in certain applications where discs will not be distributed or exchanged outside a private group and will not be archived for a long time, a proprietary format may be an acceptable way to obtain greater capacity up to 1. If you’re asking for technical help, please be sure to include all your system info, including operating system, model number, and any other specifics related to the problem.

Alternatively, find the drive Inquiry String by using the steps in the ” Identifying your drive ” section. The polycarbonate material and possible gold or silver in the reflective layer would make CD-Rs highly recyclable. Please remember to be considerate of other members. A balanced CD vibrates only slightly when rotated at high speed.

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Identifying your drive To identify the drive that is installed in your system, follow the appropriate directions below, then look through the drive lists for the matching Inquiry String. As the ATIP is part of the Orange Book standard, it is natural that its design does not support some nonstandard disc configurations.


Do not post advertisements, offensive material, profanity, or personal attacks. By using this site, you agree to the Terms of Use and Privacy Policy. According to research ada;i by J. See also History of optical storage media High-definition optical disc format war. Retrieved from ” https: These include ensuring that the recorder and writing software cfr properly configured, defragmenting the operating system and data source hard disk partitions, adwpi from any networks, closing all other programs and disabling background tasks such as power managers and anti-virus software.

CD-Writing with an ATAPI CDR Mini-HOWTO LG #57

In more stubborn cases additional measures to be considered include reducing writing speed as well as enabling the recording software to build a temporary image on the hard disk drive before recording. Cdrr March 3, The quality of the disc is also not only dependent on the dye used, it is also influenced by sealing, the top layer, the reflective layer, and the polycarbonate.

Back to Hardware Forum 9 total posts Page 1 of 1. Daapi the data requires physically destroying the disc or data layer. This article needs additional citations for verification. Depending upon the product, some recorders have pass-through arrangements allowing both a printer and recorder to be connected to the computer at the same time.

In addition to long cable lengths, SCSI allows for both internal and external attachments.