You should never use a pen, pencil or hard-tip marker to write on your CDs
That is among several recommendations made by computer scientists at the National Institute of Standards and Technology (NIST), who sliced, diced and baked CDs and DVDs to see how long the digital information would survive.
Most CDs and DVDs will last 30 years or more if handled with care, but many factors can slash their longevity. Direct exposure to sunlight can do a great deal of damage both from the suns ultraviolet rays and the heat. Indeed, any rapid significant change in temperature or humidity can stress the materials. The study also found that fingerprints and smudges frequently do more harm than scratches, and recommends handling discs by the outer edge or the center hole.
Philip Bulman | EurekAlert!
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