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• 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 the F12 key.
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 6. Startup menu items
Menu item
Boot
Network Boot
UEFI/Legacy Boot
90
User Guide
Selection
• Both
• UEFI Only
• Legacy Only
UEFI/Legacy Boot Priority
• UEFI First
• Legacy First
CSM Support (for UEFI Only)
• No
• Yes
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 the Wake on
LAN function 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: The system will boot by the
following UEFI/Legacy Boot Priority
setting.
• 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.
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