Patent ID: 6724707
Filing Date: 2004-04-20
Classification: G11B

Abstract:
An information carrier comprising a recording area for writing patterns which represent user information and header areas comprising patterns which represent header information, said recording area comprising synchronization areas which comprise a predetermined synchronization pattern for synchronizing a clock frequency in a device in which the information carrier is used, the user information being converted into patterns in de recording area according to a (1,7) Run Length Limited modulation code, the predetermined synchronization pattern being composed of marks and of spaces between the marks and the length of each mark and each space being expressed as a number of channel bit lengths (T), characterized in that the predetermined synchronization pattern comprises a first part containing marks having a length of 2 times the channel bit length and spaces having a length of 2 times the channel bit length, and also comprises a second part containing marks having a length of 5 times the channel bit length and spaces having a length of 5 times the channel bit length, and also comprises a third part containing marks having a length of 3 times the channel bit length and spaces having a length of 3 times the channel bit length.