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< Do not stick papers or protective sheets on the discs and do not use any protective coating spray. < Use a soft oil-based felt-tipped pen to write the information on the label side. Never use a ball-point or hard-tipped pen, as this may cause damage to the recorded side. < Never use a stabilizer. Using commercially available CD stabilizers with this unit will damage the mechanisms and cause them to malfunction. < Do not use irregular shape CDs (octagonal, heart shaped, business card size, etc.