The media format comprises two distinct components:
The Recording format, which addresses magnetic recording, track definition, sector headers, etc.
The Logical format, which addresses the organization of the data portion of sectors to support semantics of the file system.
The low level formatting shall be done using the GIGAMO standard. GIGAMO is published as a Sony-Fujitsu document and is currently not an ISO/IEC standard. The document specifying this formatting is the "GIGAMO 2.3GB 90mm Magneto-Optical Disk System in Cherry Book2 version 1.0". The Secondary Defect List shall be used.