diff --git a/plugins/hypervisors/xenserver/src/com/cloud/hypervisor/xenserver/resource/CitrixResourceBase.java b/plugins/hypervisors/xenserver/src/com/cloud/hypervisor/xenserver/resource/CitrixResourceBase.java
index da465639507..ca8a645532e 100644
--- a/plugins/hypervisors/xenserver/src/com/cloud/hypervisor/xenserver/resource/CitrixResourceBase.java
+++ b/plugins/hypervisors/xenserver/src/com/cloud/hypervisor/xenserver/resource/CitrixResourceBase.java
@@ -1151,8 +1151,8 @@ public abstract class CitrixResourceBase implements ServerResource, HypervisorRe
             vbdr.unpluggable = (volume.getType() == Volume.Type.ROOT) ? false : true;
             vbdr.userdevice = "autodetect";
             final Long deviceId = volume.getDiskSeq();
-            if (deviceId != null && !isDeviceUsed(conn, vm, deviceId)) {
-                vbdr.userdevice = deviceId.toString();
+            if (deviceId != null && (!isDeviceUsed(conn, vm, deviceId) || deviceId > 3)) {
+                    vbdr.userdevice = deviceId.toString();
             }
         }
         final VBD vbd = VBD.create(conn, vbdr);