Note that there are three important considerations to long-term data storage: ... 2) A suitable mechanism for the data recovery has to exist, or be constructed. Sufficient technical specifications of the media format has to be preserved to allow the preservation or construction of the mechanism. ... The second consideration may actually require the use of media that is not optimal for the first consideration. For instance, other forms of optical WORM discs might have better longevity than CDR, but the technical specifications are not as readily available.