This has been discussed in other threads, e.g. here, but I didn't find an entry in Feature Requests so here goes.   Unraid is not spinning down SAS drives. It appears to try, and the GUI indicates that the drive is spun down (with a grey ball and temp not being presented), but in reality these drives keep spinning, remaining warm and drawing full power, 24x7.   The problem seems to be that hdparm, which is used to spin down drives, does not affect SAS drives. A solution