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 |
|
|
