Optical storage system divider based draw verification with automatic bias or delay adjustment

An optical storage system for performing direct read after write on an optical medium, the optical storage system comprising:

• an optical head configured to provide a main beam and a side beam to an optical medium;
• and
• a controller configured to:
• write data to the optical medium via the main beam;
• directly after the writing, process a first signal resulting from the side beam being reflected from the optical medium, the first signal including the written data and noise caused by the main beam and a second signal indicative of the main beam to remove the noise and generate output indicative of the written data;
• and
• automatically adjust a direct current (DC) bias of at least one of the first and second signals according to a signal quality of the output.

An optical storage system for performing direct read after write on an optical medium, the optical storage system comprising:

• an optical head configured to provide a main beam and a side beam to an optical medium;
• and
• a controller configured to:
• write data to the optical medium via the main beam;
• read, directly after the writing, feedback from the side beam being reflected from the optical medium, the feedback including the written data and noise;
• process the feedback using data indicative of the main beam to remove the noise and generate output indicative of the written data;
• and
• automatically adjust a delay of at least one of the feedback or the data indicative of the main beam based on a signal quality of the output.