Chevrolet 2007 TrailBlazer Owner's Manua page 267

The CD player can play the smaller 3 inch (8 cm)
single CDs with an adapter ring. Full-size CDs and
the smaller CDs are loaded in the same manner.
If playing a CD-R, the sound quality can be reduced
due to CD-R quality, the method of recording,
the quality of the music that has been recorded,
and the way the CD-R has been handled.
There can be an increase in skipping, difficulty
in finding tracks, and/or difficulty in loading and
ejecting. If these problems occur, check the
bottom surface of the CD. If the surface of the
CD is damaged, such as cracked, broken, or
scratched, the CD will not play properly. If the
surface of the CD is soiled, see Care of Your CDs
and DVDs on page 302 for more information.
If there is no apparent damage, try a known
good CD.
Do not add any label to a CD, it could get
caught in the CD player. If a CD is recorded
on a personal computer and a description label
is needed, try labeling the top of the recorded
CD with a marking pen.
Notice: If a label is added to a CD, or more
than one CD is inserted into the slot at a
time, or an attempt is made to play scratched
or damaged CDs, the CD player could be
damaged. While using the CD player, use
only CDs in good condition without any
label, load one CD at a time, and keep the
CD player and the loading slot free of foreign
materials, liquids, and debris.
If an error displays, see "CD Messages" later in
this section.
LOAD: Press this button to load CDs into the
CD player. This CD player holds up to six CDs.
To insert one CD, do the following:
1. Turn the ignition on.
2. Press and release the LOAD button.
3. Wait for the indicator light, located to the
right of the slot, to turn green.
4. Load a CD. Insert the CD part way into the slot,
label side up. The player pulls the CD in.
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