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Therefore, do not leave them for a long time in the car. • New discs may have Ball-point pen some roughness around the edges. If such discs are used, the player may not work or the sound may skip. Use a ballpoint pen or the like to remove any roughness from the edge of the disc. Roughness • Never stick labels on the surface of the compact disc or mark the surface with a pencil or pen. • Never play a compact disc with any cellophane tape or other glue on it or with peeling off marks. If you try t