Mazda 2012 CX-9 Owner's Manual page 316

Interior Comfort
Rear Entertainment System
DVD-ROM, DVD-RAM, DVD+RW, CD-ROM, CDV, CD-G, CVD, VSD, SVCD,
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SACD, photo CDs, non-conventional discs (e.g. heart-shaped), and partially transparent
discs.
Discs recorded in CD-TEXT format.
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HD DVD and Blu-ray discs
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Handling of discs
Do not use non-conventional discs such as heart-shaped, octagonal discs, or discs with a
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memory portion that is transparent or translucent. The unit could be damaged.
When driving over uneven surfaces, the sound may jump.
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Be sure never to touch the signal surface when handling the discs. Pick up the discs by
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grasping the outer edge or the edge of the hole and the outer edge.
Do not write on or attach labels, stickers or similar to discs.
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Defective (cracked or badly bent) discs should never be used.
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A new disc may have rough edges on its inner and outer perimeters. If a disc with rough
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edges is used, proper setting will not be possible and the unit will not play the disc.
Remove the rough edges in advance by using a ball-point pen or pencil as shown below.
To remove the rough edges, rub the side of the pen or pencil against the inner and outer
perimeter of the discs.
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Transparent