Sony VGN-TX750P - 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 up and gently push until the disc clicks into place.
4 Close the tray by pushing it in gently.
!
Do not remove the optical disc when the computer is in a power saving mode (Standby or Hibernate). Doing so may cause the computer to malfunction.
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If you plan to use an external optical disc drive, connect the drive before you launch any preinstalled CD/DVD program.