diff --git a/dedibox/hardware/troubleshooting/diagnose-defective-disk.mdx b/dedibox/hardware/troubleshooting/diagnose-defective-disk.mdx
index 142a7fbe72..069be07d1c 100644
--- a/dedibox/hardware/troubleshooting/diagnose-defective-disk.mdx
+++ b/dedibox/hardware/troubleshooting/diagnose-defective-disk.mdx
@@ -27,15 +27,15 @@ The tool supports the vast majority of modern hard drives.
 - A Dedibox account logged into the [console](https://console.online.net)
 - A [Dedibox dedicated server](https://www.scaleway.com/en/dedibox/)
 
-## How to check a single-disk server
+## How to check server with no RAID controller
 
 1. Log into your server using SSH.
 2. Run the following command from the root account (or precede it with `sudo`):
     ```
-    smartctl -a /dev/sda
+    smartctl -a /dev/sdx
     ```
     <Message type="note">
-      The identifier `sda` refers to your hard disk.
+      The identifier `sdx` refers to your hard disk. Make sure that you replace `x` with `a`, `b` , `c`, etc. depending on the disk you want to test.
     </Message>
 
 ## How to check a Dell multi-disk server