Acer Aspire 4320 User Manual page 30

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For more information, please refer to "Acer eRecovery Management" on page
78 in the AcerSystem User's Guide.
Note: If your computer did not come with a Recovery CD or
System CD, please use Acer eRecovery Management's "System
backup to optical disc" feature to burn a backup image to CD or
DVD. To ensure the best results when recovering your system
using a CD or Acer eRecovery Management, detach all peripherals
(except the external Acer ODD, if your computer has one),
including your Acer ezDock.