Because of their susceptibility to deterioration by replay, strategies have to be in place to restrict the replay of mechanical carriers to the absolute minimum. In pre-digital times, record collections of broadcasters and national libraries typically held at least two copies of mass replicated discs; one for access and one “untouchable” for preservation. Unique recordings on cylinders or instantaneous discs were transferred to magnetic tape of which at least two copies were held — again, one for preservation and the other for access. Such strategies must be pursued until long-term preservation through digitisation can be arranged (IASA-TC 04). In collections that have not been completely digitised, the request for access is often taken as a trigger to prioritise digitisation of that material.