diff --git a/app/models/manageiq/providers/vmware/infra_manager/vm/reconfigure.rb b/app/models/manageiq/providers/vmware/infra_manager/vm/reconfigure.rb
index a7f31ed3c..7220a9400 100644
--- a/app/models/manageiq/providers/vmware/infra_manager/vm/reconfigure.rb
+++ b/app/models/manageiq/providers/vmware/infra_manager/vm/reconfigure.rb
@@ -162,6 +162,25 @@ def disk_mode(dependent, persistent)
     end
   end
 
+  def validate_device_backing(backing)
+    case backing.xsiType
+    when 'VirtualDiskFlatVer2BackingInfo'
+      valid_flat_ver_2_backing_modes = [
+        VirtualDiskMode::Persistent,
+        VirtualDiskMode::Independent_persistent,
+        VirtualDiskMode::Independent_nonpersistent
+      ].freeze
+
+      unless valid_flat_ver_2_backing_modes.include?(backing.diskMode)
+        raise MiqException::MiqVmError, "Disk mode #{backing.diskMode} is not supported for virtual disk"
+      end
+    end
+  end
+
+  def validate_device(device)
+    validate_device_backing(device.backing)
+  end
+
   def add_disk_config_spec(vmcs, options)
     raise "#{__method__}: Disk size is required to add a new disk." unless options[:disk_size_in_mb]
 
@@ -187,6 +206,8 @@ def add_disk_config_spec(vmcs, options)
           bck.fileName        = backing_filename
         end
       end
+
+      validate_device(vdcs.device)
     end
   end
 
diff --git a/spec/models/manageiq/providers/vmware/infra_manager/vm/reconfigure_spec.rb b/spec/models/manageiq/providers/vmware/infra_manager/vm/reconfigure_spec.rb
index 9e7a0008e..24720a691 100644
--- a/spec/models/manageiq/providers/vmware/infra_manager/vm/reconfigure_spec.rb
+++ b/spec/models/manageiq/providers/vmware/infra_manager/vm/reconfigure_spec.rb
@@ -189,6 +189,13 @@
       expect(subject.fetch_path("device", "backing", "diskMode")).to        eq("independent_nonpersistent")
       expect(subject.fetch_path("device", "backing", "fileName")).to        eq("[#{vm.storage.name}]")
     end
+
+    it 'with invalid diskMode' do
+      @options[:dependent]  = true
+      @options[:persistent] = false
+
+      expect { subject }.to raise_error(MiqException::MiqVmError, "Disk mode nonpersistent is not supported for virtual disk")
+    end
   end
 
   context '#remove_disk_config_spec' do