I have two drives, a 120GB SSD and a 2TB HD. I set the BIOS to boot from the SSD, and an the Drives window of Ubuntu it tells me the SSD is SDB and the HD is SDA. I would expect the SSD to be SDA because it is being boote
Boot order doesn't define devices names and the names can change if you add or remove disks.
If you change the disks frequently (add or remove fixed disks or use external disks), it is better to mount the disks using their UUID instead of device names in
You can find the UUIDs of your disks using