Seagate say that HDD have MTBF of 2M hours. By math, 2M h = cca. 228 years. Does this mean that drive will last 228 years working 0-24h? Seagate also say that HDD have AFR of 0.44%. So, if I get this right, for first year is 0.44%, for second 0.88% and so on. By this "half-life" of HDD when half of them will be dead is - 114 years of constant work 24h. My math this is in correlation with upper result, 114 is half of 228. To me, 228 years or 114 half-years sound too good to be true. So, my questions are: 1. Am I wrong in my math? 2. If I am, how can I calculate approximately how long will drive last using known MTBF and AFR from manufacturer? Thank you.