diff --git a/hard_disks.md b/hard_disks.md
index 21d57eb..6aab7d2 100644
--- a/hard_disks.md
+++ b/hard_disks.md
@@ -14,4 +14,5 @@ Mounting the new VD
 * create an access folder, maybe at //mnt/backup
 * run the mount `mount /dev/sdb1 /mnt/backup`
 * edit fstab by adding
-    //dev/sda1  /mnt/backup ext4    defaults    1   2
+    //dev/sdb1  /mnt/backup ext4    defaults    1   2
+* somehow in the process an new systemctl service module is loaded based on fstab at runs at boot