On Wed, 29 May 2019 20:31:45 -0400, "Percival P. Cassidy"
wrote:

An ST2000DM001 that has clocked up a smidgeon under 5 years (3 years
longer than its warranty) of 24/7/365 operation in my FreeNAS machine
has just reported 2968 unreadable sectors.

It has been replaced by an ST2000DM006.

Perce

I have an ST3100524AS with 2332 days on it--6.38 yrs. SMART says it is
still operating at 100% with no bad sectors. It is the C drive on a
Dell system.

I also have an HDS724040ALE640 with 2237 hours on it--6.12+ years.
SMART says it is still operating at 100% with no bad sectors.

Two newer Hitachi 4TB drives are each 2+yrs old (800+ hrs on each) and
I reasonably expect them to also last into the 2000+hour range.

Hopefully, there will be new large capacity storage in the next few
years that will permit the addition of 100+TB to 1+PB volumes.