Mazda 2012 MX-5 Owner's Manual page 241

Interior Comfort
Audio System
The CD revolves at high speed within
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the unit. Defective (cracked or badly
bent) CDs should never be used.
Do not use non-conventional discs
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such as heart-shaped, octagonal discs,
etc. The disc may not eject resulting in
a malfunction.
If the memory portion of the CD is
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transparent or translucent, do not use
the disc.
6-18
Transparent
A new CD may have rough edges on
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its inner and outer perimeters. If a disc
with rough edges is used, proper
setting will not be possible and the CD
player/In-dash CD changer will not
play the CD. In addition, the disc may
not eject resulting in a malfunction.
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 CD.
When driving over uneven surfaces,
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the sound may jump.