Method and apparatus providing read channel optimization insurance to avoid divergence in channel optimization in an assembled disk drive

A method insuring that a pre-existing read channel optimization script is controllable in terms of quality divergence, comprising the steps of:

• acquiring a first quality measure and a first parameter list;
• performing said pre-existing read channel optimization script creating a second quality measure and a second parameter list based upon said first parameter list;
• and
• convergence processing said first quality measure and said second quality measure and said first parameter list and said second parameter list;
• wherein the step convergence processing is further comprised of the steps of:
• determining if said first quality measure is greater than said second quality measure;
• determining if said second quality measure is greater than an acceptable threshold;
• performing said pre-existing read channel optimization script based upon said second parameter list, whenever said first quality measure is greater than said second quality measure and said second quality measure is greater than an acceptable threshold.