public com.google.cloud.vmmigration.v1.PreparingVMDisksStep.Builder
        getPreparingVmDisksBuilder() {
      return getPreparingVmDisksFieldBuilder().getBuilder();
    }
<pre>
Preparing VM disks step.
</pre>

<code>.google.cloud.vmmigration.v1.PreparingVMDisksStep preparing_vm_disks = 4;</code>
java-vmmigration/proto-google-cloud-vmmigration-v1/src/main/java/com/google/cloud/vmmigration/v1/CloneStep.java