Research Article
A Systemic Approach to the Preservation of Audio Documents: Methodology and Software Tools
Table 2
Types of magnetic tape carriers.
| Period | Type of recording | Composition |
| | | Base: cellulose acetate | 1935–1960 | Analogue | Magnetic pigment: Fe2O3 | | | Formats: open reel |
| | | Base: PVC | 1944–1960 | Analogue | Magnetic pigment: Fe2O3 | | | Formats: open reel |
| | | Base: polyester | 1959-today | Analogue | Magnetic pigment: Fe2O3 | | | Formats: open reel, compact cassette IEC I |
| 1969–today | Analogue/digital | Base: polyester | Magnetic pigment: CrO2 | Formats: compact cassette IEC II, DCC |
| | | Base: polyester | 1976–1980 | Analogue | Magnetic pigment: SLH Ferro (blue tabs, Type I) and FeCr (red tabs, Type II) | | | Formats: Elcaset |
| 1979–today | Analogue/digital | Base: polyester | Magnetic pigment: metal particle | Formats: compact cassette IEC IV, R-DAT |
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