The only magnetic reasons for an unsuccessful data recovery are erasure or extreme temperature exposure. Hence we need not be concerned about the magnetic properties because these temperatures will destroy the binder and the base film long before the magnetic properties are affected. The physical damage of the media is the most probable cause for unsuccessful recovery of shelf or archival storage information. This damage can be caused by equipment, environment, or mishandling. Contamination of the media is the second most probable cause.
Contamination can pre-exist, originate, or be created during every phase of the storage process.
However, it is reasonable to expect successful recorded archival data recovery after a storage period of more than ten years if reasonable diligence is applied throughout the storage process to physical handling, cleanliness, and storage environment. To ensure a storage period of more than 10 years, we recommend the following shelf or archival procedures. R.H. Keep the environment constant. Storing media in such a cool, dry place can retard chemical breakdown. Storing media away from radiation, magnetic fields, and sunlight is also very important.