All have clean S.M.A.R.T. values.
Don't be too concerned about the Hitachi's long hour count. I had him in my full tower media server which is on 24/7, and he's had an easy life there just sitting there storing DVDs. I have drives that are over 50k hours in there and have never had a failure in 6 years of running it. That little guy served me very well, but now I have 28TB in drives and I don't have an extra port for him anymore.
do NOT contact me with unsolicited services or offers