Table 5-3 Computer Setup—Advanced (for advanced users) (continued)
Option Heading
Specify the order in which legacy boot sources (such as a network interface card, internal hard drive,
USB optical drive, or internal optical drive) are checked for a bootable operating system image.
Specify the order of attached hard drives. The rst hard drive in the order will have priority in the boot
sequence and will be recognized as drive C (if any devices are attached).
NOTE: To drag a device to a preferred place, press Enter.
NOTE: MS-DOS drive lettering assignments may not apply after a non-MS-DOS operating system has
started.
Shortcut to Temporarily Override Boot Order
To boot one time from a device other than the default device specied in Boot Order, restart the computer
and press Esc (to access the Startup menu) and then F9 (Boot Menu), or only F9 (skipping the Startup menu)
when the monitor light illuminates. After POST is completed, a list of bootable devices is displayed. Use
the arrow keys to select the preferred bootable device and press Enter. The computer then boots from
the selected non-default device for this one time.
Secure Boot Conguration Congure Legacy Support and Secure Boot
Legacy Support – Lets you turn o all legacy support on the computer, including booting to DOS, running
legacy graphics cards, booting to legacy devices, and so on.
Secure Boot – Lets you make sure an operating system is legitimate before booting to it, making your
operating system resistant to malicious modication from preboot to full operating system booting,
preventing rmware attacks. UEFI and Windows Secure Boot only allow code signed by pre-approved digital
certicates to run during the rmware and operating system boot process. Default is ‘Legacy Support
Disable and Secure Boot Disable’ for non-Windows congurations. Default is ‘Legacy Support Disable and
Secure Boot Enable’ for Windows 10 and later congurations.
Secure Boot Key Management
Lets you manage the custom key settings.
Clear Secure Boot Keys
Lets you delete any previously loaded custom boot keys. Clearing keys will disable secure boot. Default is
disabled.
Reset Secure Boot keys to factory defaults
Default is disabled.
Enable MS UEFI CA key
Disabling this setting alters the Secure Boot key list to further restrict the allowed software components. Set
this option to ‘disable’ to support Device Guard.
System Options Congure Storage Controller for RAID (enable/disable)
Lets you enable onboard RAID. If the boot drive is an SED hard drive or solid-state drive, the default is AHCI.
Otherwise, the default is enabled.
POST Prompt for RAID Conguration
When disabled, the prompt for ‘RAID option ROM’ in legacy mode is suppressed.
Virtualization Technology (VTx)
Controls the virtualization features of the processor. Changing this setting requires turning the computer o
and then back on. Default is disabled.
Virtualization Technology for Directed I/O (VTd)
Controls virtualization DMA remapping features of the chipset. Changing this setting requires turning
the computer o and then back on. Default is disabled.
PCI Express Slot x (enable/disable)
44 Chapter 5 Computer Setup (F10) Utility
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