There are a range of factors to consider when prioritising conservation or migration of media, and these include the risk of degradation of the media, and the obsolescence of equipment with which to read it.
Media Stability Ratings
View the Media Stability Ratings
How long will different media last before the content becomes degraded or unreadable? This page give ratings for the relative stability of a range of formats that have been, or are, in common use in their fields.
View the Obsolescence Ratings
How easy is it to find equipment to read information from different formats? This page gives ratings for the relative ease with which a range of formats can still be used.