My new iMac just arrived yesterday, and I love it! I'm sure there is an easy answer to my question, but how can you tell that you do in fact have a fusion drive? I looked under 'about this mac", but didn't see anything there.
Or you can Get Info on your drive, as the Fusion Drive is a 128 GB SSD merged with a 1 TB HDD. It should show a capacity of 1.11TB for the combined drives.