The idea is not quite wrong you know.
Currently working on data storage using DNA; due to strong demand for storage devices with increasing capacity, DNA has been considered as a storage medium due to its information density, high durability and also has the capacity to reproduce faithfully. Recent studies based on Shannon's ability, which refers to the ability of digital data that can be transmitted without error (information) would establish the amount of information that can be stored safely at each nucleotide.
http://science.sciencemag.org/content/355/6328/950.full