Sony VGC-JS450F - Manual (Page 29)

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Using Your VAIO Computer >
Using the Optical Disc Drive
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Do not exert pressure on the drive tray. Be sure to hold the back of the drive tray when placing/removing a disc onto/from the drive tray.
4 Close the drive tray by pushing it in gently.
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Do not remove the optical disc while your computer is in Sleep mode. Be sure to bring the computer back into Normal mode before removing the disc.