Optical disc system, optical disc and recording method

An optical disc wherein:

• recording data modulated at a predetermined encoding restrictive length, and synchronization control data, which comprises of patterns having a predetermined period and is used for synchronization during readout said recording data, are recorded;
• and
• said synchronization control data comprises of patterns having a period shorter than said predetermined encoding restrictive length.

A recording method for recording, on an optical disc, recording data which is modulated according to a predetermined encoding restrictive length, comprising the steps of:

• generating synchronization control data which comprises of patterns having a period shorter than said encoding restrictive length and is used for synchronization during readout said data from said optical disc;
• and
• outputting said recording data or said synchronization control data selectively at predetermined time intervals to an optical pickup to thereby recording output signals provided to said optical pickup on said optical disc.