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Attention:
• 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. Restart the computer. When the ThinkPad logo is displayed, press F12.
2. 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 5. Startup menu items
Menu item
Selection Comments
Boot
Select the boot device when you
press the power button to turn on the
computer.
UEFI/Legacy Boot • Both (if OS Optimized Defaults
is Disabled)
• UEFI Only (if OS Optimized
Defaults is Enabled)
• Legacy Only
UEFI/Legacy Boot Priority
• UEFI First
• Legacy First
CSM Support (for UEFI Only)
• No
• Yes
Select system boot capability.
• Both: The system boots by the
following UEFI/Legacy Boot Priority
setting.
• UEFI Only: The system boots from
the UEFI enabled operating system.
• Legacy Only: The system boots 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 will be selectable. For Both or
Legacy Only mood, CSM Support will
not be selectable.
Boot Mode
• Quick
• Diagnostics
The Quick boot is intended to boot the
operating system as soon as possible
by reducing the POST elapsed time. The
Diagnostics boot is to be used for the
problem determination by performing
tests of the devices.
Option Key Display
• Enabled
• Disabled
If you select Disabled, then the message
“To interruptnormal startup, press Enter”
will not be displayed during the POST.
72 User Guide