Here's snip from a Lenovo page (different problem, but same BIOS path):
Power on, F1 to Lenovo BIOS Setup Utility > Devices > ATA Drive Setup > SATA Controller [Enhanced] > F10 Save & Exit.
Do you see it there?
The large print: please read the Community Participation Rules before posting. Include as much information as possible: model, machine type, operating system, and a descriptive subject line. Do not include personal information: serial number, telephone number, email address, etc.
The fine print: I do not work for, nor do I speak for Lenovo. Unsolicited private messages will be ignored. ... GeezBlog