Patent ID: 6584053
Filing Date: 2003-06-24
Classification: G11B

Abstract:
A data recording system for recording data on a disk, comprising:an encoder for modulating input data into recording data suitable to be recorded on a disk; a recording control circuit for controlling interruption and resumption of data recording on the disk; a recording start position detecting circuit for detecting, as a recording start position on the disk, a position continuous to the trailing end of data which have been recorded discontinuously on the disk due to the interruption of recording, when the recording is resumed after the interruption of recording by the recording control circuit; a signal synchronizing circuit for synchronizing data to be additionally recorded on the disk and output from said encoder with the data recorded on the disk, in order to output, from said encoder, data to be additionally recorded on the disk which is continuous to the data recorded on the disk immediately before the interruption of recording; and a system clock generating circuit for generating, as an operation clock for use in the operational control of said encoder, a reproducing clock obtained by reproducing the recorded data while the data to be additionally recorded which is output from said encoder is synchronized by said signal synchronizing circuit, and for generating, as said operation clock, a recording clock when said recording start position detecting circuit detects said recording start position; wherein said system clock generating circuit supplies a reproducing clock to said encoder as the operation clock before said recording start position is detected by said recording start position detecting circuit; said data to be additionally recorded which is output from said encoder is synchronized with the data already recorded on the disk by said signal synchronizing circuit while said encoder executes a modulation processing operation synchronous with the reproducing clock; and when said recording start position is detected by said recording start position detecting circuit, the operation clock supplied from said system clock generating circuit to said encoder is switched from said reproducing clock to a recording clock, and then, output of data to be additionally recorded from said encoder is resumed to resume the recording on the disk.