Archival stability of IBM 3480/3490 cartridge tapes

The IBM 3480/3490 cartridge tape established a new format for digital data recording. Increased data rate and capacity compared to reel-to-reel digital tape technology was achieved along with a considerable reduction in the size and cost. Methods for the archival storage of magnetic tapes are discussed. The importance of proper binder selection to minimize chemical-degradation-induced deterioration of tape performance is reviewed briefly. In addition, the mechanical attributes of a magnetic coating required to minimize the friction, distortion, and detrimental effects of stress relaxation during long periods of storage are described. The importance of acquiring a detailed knowledge of the operable mechanisms that impact tape performance and the relevance of accelerated aging studies is emphasized. The design features of the 3480/3490 magnetic tape subsystems that improve its toleration of tape deficiencies are discussed. The mechanisms of failure to which these tape subsystems are ultimately vulnerable are then used to recommend procedures and conditions for optimum storage of recorded tape cartridges.