diff --git a/readme.md b/readme.md
index 4ccb4df..cb85f9e 100644
--- a/readme.md
+++ b/readme.md
@@ -184,11 +184,11 @@ docker run -it --rm --name qemu -e "BOOT=http://example.com/image.iso" -p 8006:8
 
   ```yaml
   devices:
-    - /dev/sdb:/dev/disk1
-    - /dev/sdc:/dev/disk2
+    - /dev/sdb:/disk1
+    - /dev/sdc:/disk2
   ```
 
-  Use `/dev/disk1` if you want it to become your main drive, and use `/dev/disk2` and higher to add them as secondary drives.
+  Use `/disk1` if you want it to become your main drive, and use `/disk2` and higher to add them as secondary drives.
 
 * ### How do I pass-through a USB device?
 
diff --git a/src/disk.sh b/src/disk.sh
index ff1343f..8659e4d 100644
--- a/src/disk.sh
+++ b/src/disk.sh
@@ -498,6 +498,11 @@ fi
 : "${DEVICE3:=""}"
 : "${DEVICE4:=""}"
 
+[ -z "$DEVICE" ] && [ -b "/disk1" ] && DEVICE="/disk1"
+[ -z "$DEVICE2" ] && [ -b "/disk2" ] && DEVICE2="/disk2"
+[ -z "$DEVICE3" ] && [ -b "/disk3" ] && DEVICE3="/disk3"
+[ -z "$DEVICE4" ] && [ -b "/disk4" ] && DEVICE4="/disk4"
+
 [ -z "$DEVICE" ] && [ -b "/dev/disk1" ] && DEVICE="/dev/disk1"
 [ -z "$DEVICE2" ] && [ -b "/dev/disk2" ] && DEVICE2="/dev/disk2"
 [ -z "$DEVICE3" ] && [ -b "/dev/disk3" ] && DEVICE3="/dev/disk3"