MSI GT780DXR User Manual page 97

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This notebook is equipped with a high-capacity Li-ion battery
pack, and the battery pack is replaceable by users.
To replace the battery pack, please refer to the section of
Using Battery power for details.
This notebook is equipped with an optical drive device, and
this device may be upgradable and replaceable by the
authorized dealer or service center.
This notebook is equipped with a hard disk drive, and this
storage device may be upgradable and replaceable by the
authorized dealer or service center.
Additional memory module may be installed, by the authorized
dealer or service center, to increase the performance of this
notebook, depending on the specification limitation.