Acer AR320 F1 - Manual (Page 102)

4 System BIOS 84
Boot menu
The Boot menu allows you to set the drive priority during system boot-
up. BIOS setup will display an error message if the drive specified is not
bootable.
By default, the server searches for boot devices in the following order:
1
Hard disk drive
2 Optical disk drive
3 Removable device
4 Network device