Sony VGN-FW190U - Manual (Page 38)

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Using Your VAIO Computer
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.
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If you plan to use an external optical disc drive, connect the drive before you launch any preinstalled disc operation program.