Tuesday, May 11, 2010

DVD as a Backup Medium

There are two considerations for a backup medium: obsolescence and durability. If there is no device that can read the medium, it is obsolete and the data is unavailable and thus lost.

Durability of DVDs is measured by how long the data may be read from the disc, assuming compatible devices exist that can read it: that is, how long the disc can be stored until data is lost. Five factors affect durability: sealing method, reflective layer, organic dye makeup, where it was manufactured, and storage practices.[36]

The longevity of the ability to read from a DVD+R or DVD-R, is largely dependent on manufacturing quality[37] ranging from 2 to 15 years,[38][39][40] and is believed to be an unreliable medium for backup unless great care is taken for storage conditions and handling.

According to the Optical Storage Technology Association (OSTA), "manufacturers claim life spans ranging from 30 to 100 years for DVD, DVD-R and DVD+R discs and up to 30 years for DVD-RW, DVD+RW and DVD-RAM

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