One thing that many users forget is that there is a LASER in those drives. If the lens on the end of the laser is contaminated with dust, etc., the effectiveness of that system may be compromised. I open the case on all 4 of mine and use a very soft mini-paintbrush to wisk away any lens contaminants. That always brings optimum operation back, BUT USE CARE!!! Do not force the laser transport system or bracket into any position other than where it is at the 'rest' position and DO NOT apply much pressure on it vertically. Just a gentle sweeping motion is all that is required. DO NOT use solvents, cleaners or other chemicals. If contamination is significant, a SMALL amount of rubbing alcohol on the very tip of the paintbrush will help. Let it AIR DRY.
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