Sony VGN-TZ340NCP - Manual (Page 42)

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Using Your VAIO Computer
3 Place a disc in the middle of the tray with the label side facing upward and gently push it down until the disc clicks into
place.
4 Close the tray by pushing it in gently.
!
Do not remove the optical disc when your computer is in a power saving mode (Sleep or Hibernate). Doing so may cause the computer to malfunction.
✍
If you plan to use an external optical disc drive, connect the drive before you launch any preinstalled disc operation program.