Patent ID: 7778131

Claim:
An optical disk writing apparatus configured to write data onto a recording region of an optical disk, the recording region including a plurality of blocks, the plurality of blocks comprising an error correction code, the optical disk writing apparatus comprising: a buffer for recording data, a supply circuit configured to supply data to the buffer, a writing device configured to write data recorded in the buffer onto the recording region of the optical disk, a detector configured to read out from the recording region of the optical disk a signal representing data written by the writing device during a period in which an amount of data recorded in the buffer and not yet written onto the optical disk is less than a predetermined amount, a correction processor configured to correct in one of the plurality of blocks an error in the signal read out by the detector using the error correction code based on a single corresponding block, wherein the correction processor corrects the error in each of the plurality of blocks, an evaluation processor configured to evaluate a writing quality of the writing device using a signal output by the correction processor, and a control processor configured to control an energy density employed in writing data onto the optical disk by the writing device according to evaluation by the evaluation processor.