Asus A2Dc - Manual (Page 116)

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BIOS Setup
Boot (sub-menu) Hard Disk / Removable / CDROM Drives
Selecting this item from the previous menu displays the page as shown below.
These pages allow you to select the drive to represent each of the boot devices.
Hard Disk Drives [xxxxxxxxxx]
Removable Drives [xxxxxxxxxx]
ATAPI CDROM Drives [xxxxxxxxxx]