private void addDisks(XMLBuilder sectionBuilder, VMSpec spec) {
XMLBuilder bootDiskBuilder = sectionBuilder.e("ovf:Item");
bootDiskBuilder.e("rasd:AllocationUnits").t("Gigabytes");
bootDiskBuilder.e("rasd:Caption").t("");
bootDiskBuilder.e("rasd:Description").t("Hard Disk");
bootDiskBuilder.e("rasd:ElementName").t(spec.getBootDeviceName());
bootDiskBuilder.e("rasd:HostResource").t("boot");
bootDiskBuilder.e("rasd:InstanceID").t("4");
bootDiskBuilder.e("rasd:ResourceType").t(ResourceType.BASE_PARTITIONABLE_UNIT.value());
bootDiskBuilder.e("rasd:VirtualQuantity").t(spec.getBootDiskSize() + "");