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--- doc:appunti:hardware:raspberrypi_nas_smart_hard_disk [2021/04/16 15:11] – [smartctl] niccolo
+++ doc:appunti:hardware:raspberrypi_nas_smart_hard_disk [2021/04/16 15:18] – [hdparm] niccolo
@@ Line 99: / Line 99: @@
 </code>
-Regardless of the APM level, we can set the hard disk **Standby timer** (spindown) after 30 minutes of inactivity. See **man hdparm** for explanation of the number following the **%%-S%%** option (it seems that there is not way to know the timeout once you have set it):
+Regardless of the APM level, we can set the hard disk **Standby timer** (spindown) after 30 minutes of inactivity. See **man hdparm** for explanation of the number following the **%%-S%%** option (the granularity of the timer up to 20 minutes is 5 seconds, above that threshold it is 30 minutes). It seems that there is not way to know the timeout once you have set it.
 <code>
@@ Line 119: / Line 119: @@
 # It is advisable to disable write cache in this case.
 # See man hdparm(8), -S and -W options.
+# The granularity of the spindown_time up to 20 minutes is 5
+# seconds, above that threshold it is 30 minutes.
 /dev/sda {
         write_cache = off