Problem description
Bit rot, also known as bit decay, data rot, or data decay, is a colloquial computing term used to describe either a gradual decay of storage media
or (facetiously) the spontaneous degradation of a software
program over time. The latter use of the term implies that software can wear out or rust
like a physical tool. More commonly, bit rot refers to the decay of physical storage media.
Bit rot, also known as bit decay, data rot, or data decay, is a colloquial computing term used to describe either a gradual decay of storage media
or (facetiously) the spontaneous degradation of a software
program over time. The latter use of the term implies that software can wear out or rust
like a physical tool. More commonly, bit rot refers to the decay of physical storage media.
http://en.wikipedia.org/wiki/Bit_rot
http://www.wisegeek.com/what-is-bitrot.htm
http://www.pcmech.com/article/how-to-avoid-bit-rot/