I think the guy was little confused. Some burned discs may not work in some CD players due to lower reflectivity and nonuniform pits size of burn disc, but those discs should have no contact with anything inside a player except the hub that's holding it, so unless the disc was defective and warped or had some paper label that got loose, there is no difference between commercial and home brew as far as damage goes. As a matter of fact commercial discs can be defective as well (disc can warp under extreme heat and damage something inside when spinning at high speed). Most common problems with CD players are: dirty lens (you can buy cleaning discs), stuck laser assembly (you could grease the rails and make it work again but you would need to take it apart) and general electric failure where something is not connecting properly. BTW Toyota officially supports playing burned discs, it's in the manual and even says which formats the radio will support and what discs can damage the radio. I would ask him right away how he came to the conclusion that the player was damaged by disc and for two reasons: If they guy is full of it I would call him on that, if the guy really knows something about the radio I don't, it could save me from breaking another player.