From 2a97ded0f887dafa3af4def91b91626af1736378 Mon Sep 17 00:00:00 2001
From: Klesh Wong <klesh@qq.com>
Date: Wed, 26 Apr 2023 20:21:19 +0800
Subject: [PATCH] docs: add hdparm quick reference

---
 cli/hdparm.md | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100644 cli/hdparm.md

diff --git a/cli/hdparm.md b/cli/hdparm.md
new file mode 100644
index 0000000..26fa3ce
--- /dev/null
+++ b/cli/hdparm.md
@@ -0,0 +1,22 @@
+
+enable power save
+```
+hdparm -B 127 /dev/sdX
+```
+
+set spindown time to 20min (1-240) x 5sec
+```
+hdparm -S 240 /dev/sdX
+```
+
+check current state
+```
+hdparm -C /dev/sdX
+```
+
+to persistent configuration across reboot using udev rule, please put the following content to `/etc/udev/rules.d/69-hdparm.rules`
+```
+ACTION=="add|change", KERNEL=="sd[a-z]", ATTRS{queue/rotational}=="1", RUN+="/usr/bin/hdparm -B 127 -S 240 /dev/%k"
+```
+
+for more detail: https://wiki.archlinux.org/title/hdparm