Disc Read Error and laser degradation
The PS2 Disc Read Error can originate from either the CD lens (affecting PS1 titles and CD audio) or the DVD lens (affecting PS2 games and DVD films), or both. The dual-lens design of the fat PS2 drive means that fault isolation is more complex than on a single-lens platform — confirming which media types fail helps localise the fault to the specific lens. Laser potentiometer adjustment can restore a marginal lens; replacement is required for a lens that has degraded past the point of adjustment. The PS2 slim uses a different single-lens drive that is more straightforward to service.
