diff --git a/sandbox-providers/tmrk-enterprisecloud/src/main/java/org/jclouds/tmrk/enterprisecloud/domain/Actions.java b/sandbox-providers/tmrk-enterprisecloud/src/main/java/org/jclouds/tmrk/enterprisecloud/domain/Actions.java
index 29b80c90a2..64ae9c5125 100644
--- a/sandbox-providers/tmrk-enterprisecloud/src/main/java/org/jclouds/tmrk/enterprisecloud/domain/Actions.java
+++ b/sandbox-providers/tmrk-enterprisecloud/src/main/java/org/jclouds/tmrk/enterprisecloud/domain/Actions.java
@@ -68,7 +68,7 @@ public class Actions {
        }
    }
 
-   public Actions() {
+   private Actions() {
       //For JAXB and builder use
    }
 
diff --git a/sandbox-providers/tmrk-enterprisecloud/src/main/java/org/jclouds/tmrk/enterprisecloud/domain/hardware/Disks.java b/sandbox-providers/tmrk-enterprisecloud/src/main/java/org/jclouds/tmrk/enterprisecloud/domain/hardware/Disks.java
index 3f336e6392..3334808429 100644
--- a/sandbox-providers/tmrk-enterprisecloud/src/main/java/org/jclouds/tmrk/enterprisecloud/domain/hardware/Disks.java
+++ b/sandbox-providers/tmrk-enterprisecloud/src/main/java/org/jclouds/tmrk/enterprisecloud/domain/hardware/Disks.java
@@ -35,9 +35,52 @@ import static com.google.common.base.Preconditions.checkNotNull;
  */
 public class Disks {
 
-    private LinkedHashSet<VirtualDisk> disks = Sets.newLinkedHashSet();
+   @SuppressWarnings("unchecked")
+   public static Builder builder() {
+      return new Builder();
+   }
+
+   public Builder toBuilder() {
+      return new Builder().fromDisks(this);
+   }
+
+   public static class Builder {
+
+       private Set<VirtualDisk> disks = Sets.newLinkedHashSet();
+
+       /**
+        * @see Disks#getVirtualDisks()
+        */
+       public Builder disks(Set<VirtualDisk> disks) {
+          this.disks = Sets.newLinkedHashSet(checkNotNull(disks, "disks"));
+          return this;
+       }
+
+       public Builder addDisk(VirtualDisk disk) {
+          disks.add(checkNotNull(disk,"disk"));
+          return this;
+       }
+
+       public Disks build() {
+           return new Disks(disks);
+       }
+
+       public Builder fromDisks(Disks in) {
+         return disks(in.getVirtualDisks());
+       }
+   }
 
     @XmlElement(name = "Disk")
+    private LinkedHashSet<VirtualDisk> disks = Sets.newLinkedHashSet();
+
+    private Disks() {
+      //For JAXB and builder use
+    }
+
+    private Disks(Set<VirtualDisk> disks) {
+       this.disks = Sets.newLinkedHashSet(disks);
+    }
+
     public void setVirtualDisk(VirtualDisk disk) {
         checkNotNull(disk,"disk");
         this.disks.add(disk);
diff --git a/sandbox-providers/tmrk-enterprisecloud/src/main/java/org/jclouds/tmrk/enterprisecloud/domain/hardware/HardwareConfiguration.java b/sandbox-providers/tmrk-enterprisecloud/src/main/java/org/jclouds/tmrk/enterprisecloud/domain/hardware/HardwareConfiguration.java
index 6378452550..e0ddd271d8 100644
--- a/sandbox-providers/tmrk-enterprisecloud/src/main/java/org/jclouds/tmrk/enterprisecloud/domain/hardware/HardwareConfiguration.java
+++ b/sandbox-providers/tmrk-enterprisecloud/src/main/java/org/jclouds/tmrk/enterprisecloud/domain/hardware/HardwareConfiguration.java
@@ -151,7 +151,7 @@ public class HardwareConfiguration extends BaseResource<HardwareConfiguration> {
    }
 
    @XmlElement(name = "Actions", required = false)
-   private Actions actions = new Actions();
+   private Actions actions = Actions.builder().build();
 
    @XmlElement(name = "ProcessorCount", required = true)
    private int processorCount;
@@ -160,14 +160,14 @@ public class HardwareConfiguration extends BaseResource<HardwareConfiguration> {
    private Memory memory;
 
    @XmlElement(name = "Disks", required = false)
-   private Disks virtualDisks = new Disks();
+   private Disks virtualDisks = Disks.builder().build();
 
    @XmlElement(name = "Nics", required = false)
    private Nics virtualNics = new Nics();
 
    public HardwareConfiguration(Set<Action> actions, int processorCount, @Nullable Memory memory, Set<VirtualDisk> virtualDisks, Set<VirtualNic> virtualNics) {
        this.actions = Actions.builder().actions(checkNotNull(actions, "actions")).build();
-       for( VirtualDisk disk: checkNotNull(virtualDisks, "virtualDisks")) this.virtualDisks.setVirtualDisk(disk);
+       this.virtualDisks = Disks.builder().disks(checkNotNull(virtualDisks,"virtualDisks")).build();
        for( VirtualNic virtualNic: checkNotNull(virtualNics, "virtualNics")) this.virtualNics.setVirtualNic(virtualNic);
 
        this.processorCount = processorCount;
diff --git a/sandbox-providers/tmrk-enterprisecloud/src/main/java/org/jclouds/tmrk/enterprisecloud/domain/network/AssignedIpAddresses.java b/sandbox-providers/tmrk-enterprisecloud/src/main/java/org/jclouds/tmrk/enterprisecloud/domain/network/AssignedIpAddresses.java
index 301a1b7f91..52f880eeed 100644
--- a/sandbox-providers/tmrk-enterprisecloud/src/main/java/org/jclouds/tmrk/enterprisecloud/domain/network/AssignedIpAddresses.java
+++ b/sandbox-providers/tmrk-enterprisecloud/src/main/java/org/jclouds/tmrk/enterprisecloud/domain/network/AssignedIpAddresses.java
@@ -37,7 +37,7 @@ public class AssignedIpAddresses extends BaseResource<AssignedIpAddresses> {
    //TODO links
 
    @XmlElement(name = "Actions", required = true)
-   private Actions actions = new Actions();
+   private Actions actions = Actions.builder().build();
 
    @XmlElement(name = "Networks", required = true)
    private DeviceNetworks networks = new DeviceNetworks();
diff --git a/sandbox-providers/tmrk-enterprisecloud/src/main/java/org/jclouds/tmrk/enterprisecloud/domain/vm/VirtualMachine.java b/sandbox-providers/tmrk-enterprisecloud/src/main/java/org/jclouds/tmrk/enterprisecloud/domain/vm/VirtualMachine.java
index 29ff17e012..affdb76981 100644
--- a/sandbox-providers/tmrk-enterprisecloud/src/main/java/org/jclouds/tmrk/enterprisecloud/domain/vm/VirtualMachine.java
+++ b/sandbox-providers/tmrk-enterprisecloud/src/main/java/org/jclouds/tmrk/enterprisecloud/domain/vm/VirtualMachine.java
@@ -63,7 +63,7 @@ public class VirtualMachine extends BaseNamedResource<VirtualMachine> {
    public static class Builder extends BaseNamedResource.Builder<VirtualMachine> {
       //TODO There are some more fields
       private Links links = new Links();
-      private Actions actions = new Actions();
+      private Actions actions = Actions.builder().build();
       private Tasks tasks = new Tasks();
       private String description;
       private VirtualMachineStatus status;
@@ -275,7 +275,7 @@ public class VirtualMachine extends BaseNamedResource<VirtualMachine> {
    private Tasks tasks = new Tasks();
 
    @XmlElement(name = "Actions", required = true)
-   private Actions actions = new Actions();
+   private Actions actions = Actions.builder().build();
 
    @XmlElement(name = "Description", required = true)
    private String description;
diff --git a/sandbox-providers/tmrk-enterprisecloud/src/test/java/org/jclouds/tmrk/enterprisecloud/hardware/DisksTest.java b/sandbox-providers/tmrk-enterprisecloud/src/test/java/org/jclouds/tmrk/enterprisecloud/hardware/DisksTest.java
new file mode 100644
index 0000000000..54ce6db170
--- /dev/null
+++ b/sandbox-providers/tmrk-enterprisecloud/src/test/java/org/jclouds/tmrk/enterprisecloud/hardware/DisksTest.java
@@ -0,0 +1,58 @@
+/**
+ * Licensed to jclouds, Inc. (jclouds) under one or more
+ * contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  jclouds licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.jclouds.tmrk.enterprisecloud.hardware;
+
+import org.jclouds.tmrk.enterprisecloud.domain.Size;
+import org.jclouds.tmrk.enterprisecloud.domain.hardware.Disks;
+import org.jclouds.tmrk.enterprisecloud.domain.hardware.VirtualDisk;
+import org.testng.annotations.BeforeMethod;
+import org.testng.annotations.Test;
+
+import java.net.URISyntaxException;
+import java.util.Set;
+
+import static org.testng.Assert.assertEquals;
+import static org.testng.Assert.assertTrue;
+
+/**
+ * @author Jason King
+ */
+@Test(groups = "unit", testName = "DisksTest")
+public class DisksTest {
+
+   private VirtualDisk disk;
+   private Disks disks;
+
+   @BeforeMethod()
+   public void setUp() throws URISyntaxException {
+      disk = VirtualDisk.builder().index(0).name("test disk").size(Size.builder().value(1).unit("GB").build()).build();
+      disks = Disks.builder().addDisk(disk).build();
+   }
+
+   @Test
+   public void testAddDisk() throws URISyntaxException {
+      VirtualDisk disk2 = VirtualDisk.builder().index(1).name("test disk 1").size(Size.builder().value(1).unit("GB").build()).build();
+      Disks twoDisks = disks.toBuilder().addDisk(disk2).build();
+      Set<VirtualDisk> virtualDisks = twoDisks.getVirtualDisks();
+
+      assertEquals(2, virtualDisks.size());
+      assertTrue(virtualDisks.contains(disk));
+      assertTrue(virtualDisks.contains(disk2));
+   }
+}