Due to the ageing process, innumerable magnetic tapes from the 1970s, 80s and the 1990s are no longer playable.
This applies not only to 1 inch standards but also to ½ and ¾ inch tapes such as UMatic, Betacam, M II, D3 and many others.
The practice shows that currently AGFA and BASF tapes are particularly affected.
Often the magnetic layer dissolves from the carrier film and smear the video heads.
Another phenomenon is the bonding of the tapes. Since the tape predominantly sticks to the scanner, the tension arms and Audio Heads, the strip tension is massively increased and the tape stretched. In the worst case this can lead to the tearing of the tape.
Many tapes can be regenerated by an elaborate chemical and/or thermal treatment, once played and digitized.