My new iMac just bought in Apple store online has the following HD S.M.A.R.T. data: HD Power cycle count: 392 Power on Time: 86 hours SSD 128gb (Fusion Drive) Power cycle count: 126 Power on time: 124 iMac Data production: september 2015 Osx preisnstalled: 10.11.6 I suspect it's not brand new. How is it possible?
Drives and computers have burn in time, and that accounts for the SMART data you're seeing. I'd not be bothered by it.