Audio cd how long

The combination of high humidity and increased temperatures will accelerate the oxidation rate. The life expectancy of a ROM disc therefore depends on the environmental conditions to which it is exposed over time.

Generally, it is best to keep ROM discs in a dry, cool environment. Other contaminates, however, such as inks, solvents, and pollutants, have the potential to irreversibly penetrate and to deform, discolor, or corrode the disc, causing permanent reading problems for the laser.

The tests are generally performed by manufacturers, and the discs are usually categorized by the metal and dye types used in the disc. These discs use gold, silver, or a silver alloy for the reflective layer instead of aluminum as in ROM discs. Gold will not corrode but is expensive. Silver is more reflective and cheaper than gold but is susceptible to corrosion if exposed to sulfur dioxide, an air pollutant that can penetrate the disc in the same way oxygen can-with moisture.

Manufacturers use various silver alloys to help inhibit silver corrosion, and most R discs available today use a silver alloy reflective layer.

The chance of silver corrosion from exposure to sulfur dioxide is less than the chance of aluminum oxidation caused by high humidity. With proper storage, these discs will outlast the technology. R discs use a dye-based layer organic dye for recording data. The organic dye used in the data layer of R discs degrades naturally but slowly over time. High temperatures and humidity will accelerate the process. Prolonged exposure to UV light can degrade the dye properties and eventually make the data unreadable.

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But that wasn't enough. Norio Ohga said so. Ohga was a man mad about audio. He trained as an opera singer and, after listening to Sony's tape recorder for the first time, he sent a letter criticizing its audio quality.

He was offered a job at the company, and his influence was so big that he became president of Sony in the 80s. But, back then, he was just overseeing the project and he demanded that the CD format should be able to play back the whole Ninth Symphony.