Putting drives to sleep reduces their lifespan? I thought it was some calculus involved where if they were offline for long enough to offset the cost of the spinup during a time period it was fine. Either way I have an unraid server with 6 disks being put to sleep after 4 hours inactivity and been running that for years. Have had to replace 2 pre owned drives and 1 new WD red that was under warranty in several years.