| 摘要 |
An optical recording and readout system comprises a first optical system for projecting a plurality of optical beams onto a phase-change optical disk, a second optical system for picking out the reflected light from the optical disk, a optical sensor for sensing the reflected light picked out by the second optical system, and a signal generating circuit for producing an information signal from the output signal from the optical sensor, wherein the phase-change optical disk contains a data area containing land tracks and groove tracks on both of which user information is recorded, the land tracks and groove tracks being formed on the data area alternately, and a header area in which header information is recorded in the form of prepit rows every other track with respect to the tracks including the land and groove tracks.
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