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BDs can be stored and used in a surprisingly wide range of environments (see Tables 51, 52, and 53, for recommended temperature and humidity ranges) You can keep them in your refrigerator or in your hot water heater, although neither of these storage methods is a recommended alternative to a sturdy shelf or cabinet A cool, dry storage environment is best for long-term data protection If a disc has been kept in an environment significantly different from the operating environment, it should be conditioned in the operating environment for at least two hours before use BDs are quite stable, and if treated well, they usually will last longer than the person who
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owns them Estimating the lifetime of a storage medium is a complex process that relies on simulated aging and statistical extrapolations Based on accelerated aging tests and past experience with optical media, the consensus is that replicated discs will last from 50 to 300 years Organic-dye-based discs, such as, some types of BD-R discs, are expected to last from 20 to 250 years, about as long as CD-R discs3 Shelf life before recording is about 10 years The primary factor in the lifespan of these BD-R discs is aging of the organic dye material, which can change its absorbance properties Long-term storage of this type of BD-Rs should be in a relatively dark environment, because the dyes are photosensitive, especially to blue or UV light (both of which are present in sunlight) Cyanine media are more susceptible than phthalocyanine media Anecdotal reports have circulated of CD-R and DVD-R discs wearing out after being played for long periods of time, ostensibly because of alteration in the dye caused by reading it with a laser, but there are counter-reports of discs that play in kiosks 24 hours a day for years without a hitch The phase-change format (BD-RE and some BD-R) discs are expected to last from 25 to 100 years The primary factor in the lifespan of these discs is the chemical tendency of phasechange alloys to separate and aggregate, thus reducing their ability to hold state This also limits the number of times a disc can be rewritten In all cases, longevity can be reduced by materials of poor quality or a shoddy manufacturing process Pressed BDs of inferior quality may deteriorate within a few years, and cheap recordable BDs may produce errors during recording or become unreadable soon after recording For comparison, magnetic media (tapes and disks) last 10 to 30 years; high-quality, acidneutral paper can last a hundred years or longer; and archival-quality microfilm is projected to last 300 years or more Remember that computer storage media often become technically obsolete within 20 to 30 years, long before they physically deteriorate In other words, long before the discs become nonviable, it may become difficult or impossible to find the equipment to read them BDs may be subject to laser rot oxidation of the reflective layer Media types such as dual-layer discs and BD-Rs that use gold for the reflective layer are not susceptible to oxidation because gold is a stable element
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Handle discs only by the hub or outer edge Do not touch the shiny surface with your popcorn-greasy fingers Store the disc in a protective case when not in use Do not bend the disc when taking it out of the case, and be careful not to scratch the disc when placing it in the case or in the player tray Make certain that the disc is seated properly in the player tray before you close it Keep discs away from radiators/heaters, hot equipment surfaces, direct sunlight (near a window or in a car during hot weather), pets, small children, and other destructive forces
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3Kodak officially states that its CD-R media will last 100 years if stored properly Testing by Kodak engineers indicates that 95 percent of the discs should last 217 years
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