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The model number is located on the bottom of your notebook.

 Gateway® M-1615 Notebook
 Gateway® M-1617 Notebook
 Gateway® M-1618 Notebook
 Gateway® M-1618N Notebook
 Gateway® M-1618R Notebook
 Gateway® M-1619j Notebook
 Gateway® M-1622 Notebook
 Gateway® M-1622h Notebook
 Gateway® M-1624 Notebook
 Gateway® M-1625 Notebook
 Gateway® M-1626 Notebook
 Gateway® M-1628 Notebook
 Gateway® M-1629 Notebook
 Gateway® M-1630j Notebook
 Gateway® M-1631j Notebook
 Gateway® M-1631u Notebook
 Gateway® M-1632j Notebook
 Gateway® M-1634u Notebook