Sony VGN-BX500 - Manual (Page 73)

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Using Peripheral Devices
4 Close the tray by pushing it in gently.
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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.
The location of the drive eject button depends on the model you purchased. See Locating Controls and Ports (page 11) .