Lenovo ThinkStation P500 Configuration Manual page 9

3. Once the BIOS setup window is visible, use the left and right arrow keys to select the 'Startup'
tab. From this tab, use the up and down arrow keys to select 'CSM Configuration'.
4. For Windows 7: Under 'Storage', change the setting from "Legacy" to "UEFI" and press F10 key
to save and exit the BIOS setup menu.
For Windows 8 & Windows 10: Under 'Save & Exit', change the setting for "OS Optimized
Defaults" from "Disabled" to "Enabled" and press F10 key to save and exit the BIOS setup menu.
5. During the system reboot, enter BIOS setup using the F1 key when prompted. Once the BIOS
setup window is visible, use the left and right arrow keys to select the 'Devices' tab. From this
tab, use the up and down arrow keys to select "PCH S-SATA Configuration".