This message was posted on behalf of Intel Corporation
When switching SATA modes you are required to reinstall the operating system. In this case, order to regain access to the acceleration option you must do the following;
- Change the SATA mode from AHCI to RAID.
- Enter CTRL-I menu and set your disks to NON-RAID.
- You need to reinstall the operating system.
- Once done, you can try setting the acceleration option.
Please try the suggestion and let me know how it goes.