The laptop I have is quite a different model, so the BIOS may be different on mines than what you have.
Anyway, if you'd like to try, this is how I managed to get in the various BIOS screens:
My model is: Toshiba Satellite Pro A120
If I press, F12 after turning on the the power, the initial screen stays with the following icons shown:
On this screen, I can press left/right to select an icon and if the item is present, it will boot from it. E.g. I plugged in a bootable USB, selected the pen drive icon and it booted from the USB drive.
The main BIOS screen is a little more tricky and here's how I get into it on mine:
With the laptop off, press and hold down the 'ESC' key and with the key held down, press the power button to turn the computer on. Keep the 'ESC' key pressed until it beeps. If you've a BIOS password set, enter this.
The following message then appears on mine:
Finally when I press 'F1', I get the BIOS setup:
"Page Down" gives the 2nd screen:
Unfortunately on this one, I don't see an option for disabling native SATA mode or ACHI. However, on the first screen, I can change the boot priority.