Re: Here ... let me google that for you.
Based on that table, an MTBF of 2,000,000 hours translates to an Annual Failure Rate (AFR) of 0.44%: which means that if you have 1,000 drives then 4-5 of them will fail in the first year. Fair enough.
In practice, the AFR increases rapidly with age as the drive wears out. So this MTBF reflects only the *initial* failure rate for a drive in its first year of operation.
Hence, what they're actually saying is, the mean time between failures is 285 years, but only if you replace the drive with a brand new one every year!! (*)
(*) Or perhaps every three years, if they're warranting the AFR will remain that low for that long.