Disc recording/reproducing apparatus having a servo system capable of successively recording and reproducing tracks on a disc irrespective of turbulence of the servo system due to a disturbance

A disc recording apparatus for reproducing data successively recorded on tracks on a disc recording medium comprising:

• reproducing means for successively reproducing the recorded data at a second transfer rate which is higher than a first transfer rate required for outputting the reproduced data;
• memory means into which the reproduced data read out by the reproducing means are sequentially written at the second transfer rate and from which the thus written data are successively read out as reproduced output data at the first transfer rate;
• and
• control means for controlling the writing of the reproduced data to the memory means so that a second amount of the reproduced data is written into the memory means and an amount of reproduced data, not less than a first amount, are always stored in the memory means when the amount of the reproduced data stored in the memory means becomes not higher than the first given amount, the control means also causes the reproducing means to control the reproduction position on the recording medium so that the reproduced data sequentially written into the memory means in an interrupted manner are successively read form the recording tracks on the disc recording medium.

A disc recording apparatus for recording inputted data on tracks on a disc recording medium and reproducing data from the tracks on the disc, comprising:

• control means for controlling the reading of the memory means so that data in a first amount are successively read form the memory means when the amount of the inputted data stored in the memory means exceeds the first amount, in order to always ensure a write area for writing the data in the memory means, the write area having a capacity higher than a predetermined second amount of the inputted data, the control means being connected to the recording means to control the recording position on the disc recording medium so that the first amount of the data which are sequentially read from the memory means are successively recorded on the recording tracks of the recording medium;
• recording means for recording on the disc recording medium the data read from the memory means;
• control means for controlling the reading of the memory means so that data in a preset first amount are successively read form the memory means to always ensure a write space in the memory means which has a capacity which is higher than a predetermined second amount when the amount of the inputted data stored in the memory means exceeds the first amount, the control means being connected to the recording means to control the recording position on the disc recording medium so that data in the first amount which are sequentially red form the memory means are successively recorded on the recording tracks of the recording medium;
• reproducing means for successively reproducing the recorded data at a second transfer rate which is higher than a first transfer rate required for outputting the reproduced data;
• memory means into which the reproduced data read out by the reproducing means are sequentially written at the second transfer rate and from which the thus written data are successively read out as reproduced output data at the first transfer rate;
• and
• control means for controlling the writing of the reproduced data to the memory means so that a second amount of the reproduced data is written into the memory means and an amount of reproduced data, not less than a first amount, are always stored in the memory means when the amount of the reproduced data stored in the memory means becomes hot higher than the first given amount the control means also causes the reproducing means to control the reproduction position on the recording medium so that the reproduced data sequentially written into the memory means in an interrupted manner are successively read form the recording tracks on the disc recording medium.