This feature makes the format very efficient and suitable for random write in data as well as video applications. The writing clock as obtained from this groove is very accurate. At the same time, address information is stored in this wobbled groove by locally inverting the sign of the wobbled waveform. For each ERCO block, which is 32 kB, four addresses exist, resulting in a reliable address format with large detection margins. Manufacturer ID and Media type ID A code to identify the Manufacturer and the Media technology used.
All physical parameters fit within the DVD-ROM specification.
The choice of identical parameters optimises playability in current read-only players.