Patent ID: 7301855

Claim:
An optical storage apparatus comprising: an optical head for irradiating light onto an optical information recording medium in which a magneto-optical recording film is formed on a substrate on which phase pits are formed, detecting the light intensity of light modulated by said phase pits from return light from said optical information recording medium as ROM signals, and detecting the differential amplitude of components in a polarization direction when said return light is modulated by said magneto-optical recording film as RAM signals; a magnetic field application unit for applying a magnetic field to the information recording medium for recording the information to said magneto-optical recording film; a track actuator for accessing at least said optical head at a desired position of said optical information recording medium; a buffer memory for reading to store at least said detected ROM signals; a buffer memory for writing to store input signals to be written to said magneto-optical recording film; and a controller for reading at least said ROM signals at n (n>2) times of information regeneration velocity V, which is a reference, storing said ROM signals in said buffer memory for reading, then outputting said stored information at the velocity of said information regeneration velocity V, wherein said controller stores said input information to said buffer memory for writing, then accessing said optical head at an address position that is managed so that the time relationship of said output information and said input information link and records the information from said buffer memory for writing at said n times of velocity as RAM signals, while said stored information is being output from said buffer memory for reading.