chore: diy nas progresses

knowledge base/disks maintenance.md

@@ -0,0 +1,28 @@
+# Disks maintenance
+
+## Table of contents <!-- omit in toc -->
+
+1. [TL;DR](#tldr)
+1. [Sources](#sources)
+
+## TL;DR
+
+```sh
+# Check disks have spun down.
+# 'standby' means they did.
+smartctl -i -n standby '/dev/sda'
+hdparm -C '/dev/sd'*
+```
+
+## Sources
+
+- [`smartctl`][smartctl]
+- [`hdparm`][hdparm]
+
+<!--
+  References
+  -->
+
+<!-- Knowledge base -->
+[hdparm]: hdparm.md
+[smartctl]: smartctl.md