Sony MVC-CDZOO/CD300 Operating Instructions Manual page 16

n use only the 8 cm CD-Rs or 8 cm CD-RWs that have these
0 While sliding the lock tab to the left, slide down the disc cover
OPEN lever.
Open the disc cover by your hand after the cover is unlocked.
0 Place a disc with the printed side up.
Push down the center of the disc until it clicks. When installing, do not push
with too much force and do not touch the pickup lens.
0 Close tile disc cover.
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