Acer Altos G510 series - Manual (Page 103)

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Boot
The Boot menu allows you to specify the preferred settings during
system bootup.
Press Enter to enter the submenu screen of the parameters shown in
the screen below.
Boot Device Priority
The Boot Device Priority submenu lets you specify the boot search
sequence during the POST process.
BIOS setup will display an error message if the drive(s) specified is not
bootable.
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