Misconceptions about MAC OS X 10.2 Disc Protection

CD-ROM is currently the most commonly used media to save and transmit data, because of its small size, easy to carry, security, good compatibility, reading equipment widely favored by the vast number of computer enthusiasts. The CD-ROM consists of polymeric plastic (polycarbonate) layer, aluminum film layer and protective layer. Although its performance is stable, but many users because of the lack of understanding of the characteristics of the optical disk, went into some of the optical disc protection errors, so that the disc was damaged.
The wrong one: protect the plastic face, the disc is OK.
Many people know that the optical disc in the use of laser beam is from the plastic surface incident, plastic surface scratches, fingerprints and dust will affect the reading of the data, but plastic surface scratches can usually be compensated by error correction. In contrast, the protective coating is very thin, and a slight friction can damage it and cause fatal damage to the data. Strictly speaking, the aluminum film layer and the protective layer are more important than the plastic layer and need to be carefully protected. Also, never put a label on a protective coating. Because when the label loses its stickiness, the aluminum film is also glued, and the data stored on the disc is also taken away.
Myth Two: In the optical drive for too long time to damage the disc.
CD-ROM in the optical drive high-speed rotation, laser beam irradiation on the disc, through the intensity of the reflected beam to check out the data. In this process, the laser head does not contact with the disc directly, will not damage the disc. It's the dirt on the disc or the deformation. The assembly causes the laser beam to focus poorly, affecting the laser head positioning accuracy, and will cause mechanical damage to the optical drive when it is serious.
Myth three: CD-ROM the most important area at the rim.
CD data storage mode and floppy disk, the most important floppy disk is its outer edge of the 0.1-track, CD-ROM data is from inside to the outside spiral-shaped sequence records. Experienced friends may know that the disc close to the outer edge of the scratch can only make a few images can not be normal display, and in the inner edge of the scratches will be "shot" off the whole disk, because the inside margin at the beginning of the record on the file table data.