I've not been able to understand this feature from Google or KB searches. My Macintosh HD has no "S.M.A.R.T. Status" in Disk utility The HD does show as "S.M.A.R.T. status: Verified" in the System Information report My Thunderbolt-connected external drives do show "S.M.A.R.T. status: Verified" for both hard drives in Disk Utility. Is the absence of "S.M.A.R.T. status:" for the internal drive in Disk Utility a feature or a flaw?