docs(ddx): add edits (scaleway#4369)

pages/dedibox-hardware/troubleshooting/diagnose-defective-disk.mdx

@@ -7,7 +7,7 @@ content:
   paragraph: This page explains how to diagnose a failing disk
 tags: dedibox diagnosis failing-disk
 dates:
-  validation: 2024-09-10
+  validation: 2025-02-06
   posted: 2021-11-02
 categories:
   - dedibox-servers
@@ -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 a 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