Sony VAIO V G N - B Z 5 6 0 - Manual (Page 39)

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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.
You cannot use optical discs if you disable the optical disc drive in the BIOS setup screen. To enable the drive, follow the steps and the tip in Disabling
Built-in Devices (page 137) .
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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.