The main system disk (SSD) in my goto machine has been powered on for 2730 days (7.5 years) and still going strong. S.M.A.R.T. wearout indicator is giving it an estimated 70 days remaining, though I am pretty sure it’s been saying something around that number for years. This thing (Samsung 840 EVO) is basically a Toyota Land Cruiser, can’t be killed.