CPC Subgroup Additional Only
G11B 2220/20 Disc-shaped record carriers
Full Title
Record carriers by type > Disc-shaped record carriers
3 direct subcodes
Child Classifications
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- G11B 2220/21 characterised in that the disc is of read-only, rewritable, or recordable type
- G11B 2220/23 characterised in that the disc has a specific layer structure
- G11B 2220/25 characterised in that the disc is based on a specific recording technology