Lenovo X220-4287, X220I TABLET, X220 TABLET, 42872W5, 42875TU, 42912XU Uefi Bios Update Option

Table 7. Security menu items (continued)

Menu item	Submenu item	Selection		Comments
	Clear Security Chip	•	Enter	Clear the encryption key.
				Note: Only if you select
				“Active” for Security Chip,
				this item appears.
	Intel TXT Feature	•	Disabled	Enable or disable Intel
		•	Enabled	Trusted Execution
				Technology.
UEFI BIOS Update Option	Flash BIOS Updating by	•	Disabled	If you select “Enabled”,
	End-Users	•	Enabled	all users can update the
				UEFI BIOS. If you select
				“Disabled”, only the person
				who knows supervisor
				password can update the
				UEFI BIOS.
	Flash Over LAN	•	Disabled	Enable your computer's
		•	Enabled	UEFI BIOS to be updated
				(flashed) over an active
				network connection.
Memory Protection	Execution Prevention	•	Disabled	Some computer viruses
		•	Enabled	and worms cause memory
				buffers to overflow by
				running code where only
				data is allowed. If the
				Data Execution Prevention
				feature can be used with
				your operating system, then
				by selecting “Enabled” you
				can protect your computer
				against attacks by such
				viruses and worms. If after
				choosing “Enabled” you
				find that an application
				program does not run
				correctly, select “Disabled”
				and reset the setting.
Virtualization	Intel Virtualization	•	Disabled	If you select “Enabled,”
	Technology	•	Enabled	a VMM (Virtual Machine
				Monitor) can utilize the
				additional hardware
				capabilities provided
				by Intel Virtualization
				Technology.
	Intel VT-d Feature	•	Disabled	Intel VT-d is Intel
		•	Enabled	Virtualization Technology
				for Directed I/O. When
				enabled, a VMM can utilize
				the platform infrastructure
				for I/O virtualization.

194User Guide