The Orange Book defines CD-Recordable discs with multisession capability. Part I defines CD-MO (Magneto Optical) rewritable discs; Part II defines CD-WO (Write Once) discs; Part III defines CD-RW (Rewritable) discs. All three parts contain the following sections :
- Disc specification for unrecorded and recorded discs
- Pre-groove modulation
- Data organisation including linking
- MultiSession and hybrid discs
- Recommendations for measurement of reflectivity, power control etc.