Acer Altos G5350 Series - Manual (Page 115)

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3rd Boot Device Sets the device from which the system will attempt to
boot up when the first and second attempts failed.
Press Enter to access the Hard Disk Drives submenu.
The Hard Disk Drives submenu lets you specify the
devices that will be considered as the primary and
secondary hard drives.
4th Boot Device Sets the device from which the system will attempt to
boot up when the first, second and third attempts
failed.
Parameter Description