Slows down when reading some discs

The computer uses a normal CD-ROM drive to read most of the discs normally, but when reading certain discs, the speed is significantly slower, and even the data cannot be read.

Compared to this optical drive can read and unreadable discs, found that can not successfully read the disc is generally thin, a number of production process is too bad pirated discs. Therefore, I suspect that the CD-ROM drive is due to the CD-ROM drive in the work, can not clamp thin disc rotation, so that the disc and the active axis between the relative movement, resulting in the laser head can not read the disc data. After the optical drive is opened, the stainless steel bracket of the upper chuck is pressed gently downward so that the CD-ROM can be well clamped. Reinstall the optical drive, the power-on use, the fault is resolved.