The “Onboard Devices Configuration” section was only for front audio connectors, what to have the front LED do and a couple of other options.
Without something that explains what every option in the BIOS means, it looks like the “SATA Configuration” area that I found before is the only thing that shows it, and it’s back to if the motherboard detects something plugged into the M.2 slot, it will show it.
I’m done fussing with this problem for now and I’m going to return the M.2 stick. I’ve got Ubuntu Studio installed on a standard SSD drive and the system is very quick and responsive already. Audacity’s doing great for audio recording and editing.
I may also use it as a simple file server because I’ve got a couple of hard drives that are larger than Windows 7 64bit can cope with (see the 3TB drives and up thread). The 3TB drive is installed and when I can find where I put it, the external drive was 5TB. This won’t be the full file server I was envisioning that would have RAID, but it gives me practice with how Linux does things. I’m still getting used to the idea of after you partition a hard drive, you have to give yourself permission to use it before you can save any data to it.