Lenovo ThinkPad X1 Carbon User Manual page 121

• After you change the startup sequence, ensure that you select a correct device during a copy, a save, or a
format operation. Otherwise your data might be erased or overwritten.
• If you are using the BitLocker drive encryption, do not change the startup sequence. BitLocker drive
encryption locks the computer from starting once detects the change of startup sequence.
To change the startup sequence temporarily so that the computer starts from a desired drive, do the following:
1. Turn off the computer.
2. Turn on the computer. When the ThinkPad logo is displayed, press F12.
3. Select the device that you want the computer to start from.
Note: The Boot menu will be displayed if the computer cannot start from any devices, or the operating
system cannot be found.
The following table lists the Startup menu items. Default values are in boldface.
Note: Some items are displayed on the menu only if the computer supports the corresponding features.
Table 8. Startup menu items
Menu item
Boot
Network Boot
UEFI/Legacy Boot
Boot Mode
Value
• Both
– UEFI/Legacy Boot Priority
– UEFI First
– Legacy First
• UEFI Only
• Legacy Only
CSM Support (for UEFI Only)
• Yes
• No
• Quick
• Diagnostics
Comments
Select the boot device when you press the power
button to turn on the computer.
Select the boot device when the system wakes
from LAN. If Wake On LAN is enabled, the
network administrator can turn on all of the
computers in a LAN remotely by use of network
management software.
Select system boot capability.
• Both: Select priority of boot options between
UEFI and Legacy.
• UEFI Only: The system will boot from the
UEFI enabled operating system.
• Legacy Only: The system will boot from any
operating system other than the UEFI enabled
one.
Note: If you select UEFI Only, the system cannot
boot from the bootable devices that do not have
the UEFI enabled operating system.
Compatibility Support Module (CSM) is required
for booting the legacy operating system. If you
select UEFI Only, CSM Support is selectable.
For Both or Legacy Only mood, CSM Support
is not selectable.
Screen during the POST:
• Quick: The ThinkPad Logo screen is
displayed.
• Diagnostics: Text messages are displayed.
Note: You also can enter Diagnostic mode by
pressing Esc during the POST.
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Chapter 8 Advanced configuration
105