Sony Corporation has developed a new type of compact disc called Blu-spec CD, which has certain advantages over conventional CDs. Blu-spec CDs are created using blue laser rather than infrared. This technique improves the quality of the formation of pits - microscopic depressions in the form of which information is recorded on optical discs. Thanks to the "thinner" design of the carrier layer, the accuracy of data reading is significantly increased, and the need for error correction is practically eliminated. This has a positive effect on the level of electrical noise generated by the servo drives of the laser drive, and therefore on the sound quality.