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called life expectancy or shelf life, the time it takes for a
data-storing medium to lose half of its strength. Floppy disks
and magnetic hard drives have a half life of between five and
seven years. Optical media, such as CD-Rs, have a half life of
about 30 years.  The term comes from the scientific fields where
it means the amount of time it takes for half of something to
undergo a process or the amount of time it takes for half of the
atoms of a radioactive substance to disintegrate.  Hype Versus
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