Research Article
A Systemic Approach to the Preservation of Audio Documents: Methodology and Software Tools
Table 4
Types of optical discs [
35].
| | Carrier | Period | Type of recording | Composition |
| |
CD |
1981–today |
Digital | Base: polycarbonate | | Reflective layer: aluminium, varnish, inks |
| |
CD-recordable |
1992–today |
Digital | Base: polycarbonate | | Reflective layer: gold, silver, varnish, inks |
| |
CD-rewritable |
1996–today |
Digital | Base: polycarbonate | | Reflective layer: varnish, inks |
| |
SACD |
1999–today |
Digital | Base: polycarbonate | | Reflective layer: silver | | Coating: lacquer |
| |
DVDA |
2000–today |
Digital | Base: polycarbonate | | Inner layer: aluminium | | Outer semireflective layer: gold | | Coating: lacquer |
|
|
