diff --git a/include/maidsafe/common/data_types/data.h b/include/maidsafe/common/data_types/data.h
index 8f49f3ea..8fc8ad85 100644
--- a/include/maidsafe/common/data_types/data.h
+++ b/include/maidsafe/common/data_types/data.h
@@ -49,9 +49,9 @@ class Data {
 
   Data();
   Data(const Data&);
-  Data(Data&& other);
+  Data(Data&& other) MAIDSAFE_NOEXCEPT;
   Data& operator=(const Data&);
-  Data& operator=(Data&& other);
+  Data& operator=(Data&& other) MAIDSAFE_NOEXCEPT;
   virtual ~Data();
 
   // Returns false for a default-constructed instance of this class, otherwise true.
diff --git a/include/maidsafe/common/data_types/immutable_data.h b/include/maidsafe/common/data_types/immutable_data.h
index aff9eaa8..98640e47 100644
--- a/include/maidsafe/common/data_types/immutable_data.h
+++ b/include/maidsafe/common/data_types/immutable_data.h
@@ -35,6 +35,8 @@ namespace maidsafe {
 
 class ImmutableData : public Data {
  public:
+  static NameAndTypeId MakeNameAndTypeId(Identity name);
+
   explicit ImmutableData(NonEmptyString value);
 
   ImmutableData();
@@ -65,7 +67,7 @@ class ImmutableData : public Data {
   }
 
  private:
-  virtual std::uint32_t ThisTypeId() const final { return 0; }
+  virtual std::uint32_t ThisTypeId() const final;
 
   NonEmptyString value_;
 };
diff --git a/include/maidsafe/common/data_types/mutable_data.h b/include/maidsafe/common/data_types/mutable_data.h
index ba1a1dc1..81ec4e7e 100644
--- a/include/maidsafe/common/data_types/mutable_data.h
+++ b/include/maidsafe/common/data_types/mutable_data.h
@@ -22,6 +22,7 @@
 #include "cereal/types/base_class.hpp"
 #include "cereal/types/polymorphic.hpp"
 
+#include "maidsafe/common/config.h"
 #include "maidsafe/common/identity.h"
 #include "maidsafe/common/log.h"
 #include "maidsafe/common/types.h"
@@ -34,13 +35,15 @@ namespace maidsafe {
 
 class MutableData : public Data {
  public:
+  static NameAndTypeId MakeNameAndTypeId(Identity name);
+
   MutableData(Identity name, NonEmptyString value);
 
   MutableData();
   MutableData(const MutableData&);
-  MutableData(MutableData&& other);
+  MutableData(MutableData&& other) MAIDSAFE_NOEXCEPT;
   MutableData& operator=(const MutableData&);
-  MutableData& operator=(MutableData&& other);
+  MutableData& operator=(MutableData&& other) MAIDSAFE_NOEXCEPT;
   virtual ~MutableData() final;
 
   const NonEmptyString& Value() const;
@@ -64,7 +67,7 @@ class MutableData : public Data {
   }
 
  private:
-  virtual std::uint32_t ThisTypeId() const final { return 1; }
+  virtual std::uint32_t ThisTypeId() const final;
 
   NonEmptyString value_;
 };
diff --git a/include/maidsafe/common/data_units.h b/include/maidsafe/common/data_units.h
new file mode 100644
index 00000000..e47c567d
--- /dev/null
+++ b/include/maidsafe/common/data_units.h
@@ -0,0 +1,35 @@
+/*  Copyright 2015 MaidSafe.net limited
+
+    This MaidSafe Software is licensed to you under (1) the MaidSafe.net Commercial License,
+    version 1.0 or later, or (2) The General Public License (GPL), version 3, depending on which
+    licence you accepted on initial access to the Software (the "Licences").
+
+    By contributing code to the MaidSafe Software, or to this project generally, you agree to be
+    bound by the terms of the MaidSafe Contributor Agreement, version 1.0, found in the root
+    directory of this project at LICENSE, COPYING and CONTRIBUTOR respectively and also
+    available at: http://www.maidsafe.net/licenses
+
+    Unless required by applicable law or agreed to in writing, the MaidSafe Software distributed
+    under the GPL Licence is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
+    OF ANY KIND, either express or implied.
+
+    See the Licences for the specific language governing permissions and limitations relating to
+    use of the MaidSafe Software.                                                                 */
+
+#ifndef MAIDSAFE_COMMON_DATA_UNITS_H_
+#define MAIDSAFE_COMMON_DATA_UNITS_H_
+
+#include <chrono>
+
+namespace maidsafe {
+// SI units.
+using Bytes = std::chrono::duration<uint64_t>;
+using KiloBytes = std::chrono::duration<uint64_t, std::kilo>;
+using MegaBytes = std::chrono::duration<uint64_t, std::mega>;
+using GigaBytes = std::chrono::duration<uint64_t, std::giga>;
+using TeraBytes = std::chrono::duration<uint64_t, std::tera>;
+using PetaBytes = std::chrono::duration<uint64_t, std::peta>;
+using ExaBytes = std::chrono::duration<uint64_t, std::exa>;
+}
+
+#endif  // MAIDSAFE_COMMON_DATA_UNITS_H_
diff --git a/src/maidsafe/common/data_types/data.cc b/src/maidsafe/common/data_types/data.cc
index c66e2279..d507122f 100644
--- a/src/maidsafe/common/data_types/data.cc
+++ b/src/maidsafe/common/data_types/data.cc
@@ -53,11 +53,11 @@ Data::Data() = default;
 
 Data::Data(const Data&) = default;
 
-Data::Data(Data&& other) : name_(std::move(other.name_)) {}
+Data::Data(Data&& other) MAIDSAFE_NOEXCEPT : name_(std::move(other.name_)) {}
 
 Data& Data::operator=(const Data&) = default;
 
-Data& Data::operator=(Data&& other) {
+Data& Data::operator=(Data&& other) MAIDSAFE_NOEXCEPT {
   name_ = std::move(other.name_);
   return *this;
 }
diff --git a/src/maidsafe/common/data_types/immutable_data.cc b/src/maidsafe/common/data_types/immutable_data.cc
index fb13bb82..90c5264e 100644
--- a/src/maidsafe/common/data_types/immutable_data.cc
+++ b/src/maidsafe/common/data_types/immutable_data.cc
@@ -23,6 +23,13 @@
 #include "maidsafe/common/error.h"
 
 namespace maidsafe {
+namespace {
+const std::uint32_t kTypeId = 0;
+}
+
+Data::NameAndTypeId ImmutableData::MakeNameAndTypeId(Identity name) {
+  return NameAndTypeId{std::move(name), DataTypeId{kTypeId}};
+}
 
 ImmutableData::ImmutableData(NonEmptyString value)
     : Data(crypto::Hash<crypto::SHA512>(value)), value_(std::move(value)) {}
@@ -50,4 +57,6 @@ const NonEmptyString& ImmutableData::Value() const {
   return value_;
 }
 
+std::uint32_t ImmutableData::ThisTypeId() const { return kTypeId; }
+
 }  // namespace maidsafe
diff --git a/src/maidsafe/common/data_types/mutable_data.cc b/src/maidsafe/common/data_types/mutable_data.cc
index 5df83a92..62a9d635 100644
--- a/src/maidsafe/common/data_types/mutable_data.cc
+++ b/src/maidsafe/common/data_types/mutable_data.cc
@@ -26,6 +26,13 @@
 #include "maidsafe/common/serialisation/serialisation.h"
 
 namespace maidsafe {
+namespace {
+const std::uint32_t kTypeId = 1;
+}
+
+Data::NameAndTypeId MutableData::MakeNameAndTypeId(Identity name) {
+  return NameAndTypeId{std::move(name), DataTypeId{kTypeId}};
+}
 
 MutableData::MutableData(Identity name, NonEmptyString value)
     : Data(std::move(name)), value_(std::move(value)) {
@@ -43,12 +50,12 @@ MutableData::MutableData() = default;
 
 MutableData::MutableData(const MutableData&) = default;
 
-MutableData::MutableData(MutableData&& other)
+MutableData::MutableData(MutableData&& other) MAIDSAFE_NOEXCEPT
     : Data(std::move(other)), value_(std::move(other.value_)) {}
 
 MutableData& MutableData::operator=(const MutableData&) = default;
 
-MutableData& MutableData::operator=(MutableData&& other) {
+MutableData& MutableData::operator=(MutableData&& other) MAIDSAFE_NOEXCEPT {
   Data::operator=(std::move(other));
   value_ = std::move(other.value_);
   return *this;
@@ -62,4 +69,6 @@ const NonEmptyString& MutableData::Value() const {
   return value_;
 }
 
+std::uint32_t MutableData::ThisTypeId() const { return kTypeId; }
+
 }  // namespace maidsafe
diff --git a/src/maidsafe/common/data_types/tests/derived_data_test.cc b/src/maidsafe/common/data_types/tests/derived_data_test.cc
index ed4c47e0..587eb1a6 100644
--- a/src/maidsafe/common/data_types/tests/derived_data_test.cc
+++ b/src/maidsafe/common/data_types/tests/derived_data_test.cc
@@ -51,6 +51,8 @@ class DerivedDataTest : public testing::Test {
     }
   }
 
+  T GetData();
+
   const NonEmptyString value_;
   Identity name_;
   T data_;
@@ -58,7 +60,6 @@ class DerivedDataTest : public testing::Test {
 
  private:
   Identity GetName();
-  T GetData();
 };
 
 template <>
@@ -137,6 +138,11 @@ TYPED_TEST(DerivedDataTest, BEH_SerialiseParse) {
   EXPECT_TRUE(Equal(&this->data_, dynamic_cast<TypeParam*>(parsed_ptr.get())));
 }
 
+TYPED_TEST(DerivedDataTest, MakeNameAndTypeId) {
+  const auto data = this->GetData();
+  const auto name_and_type = TypeParam::MakeNameAndTypeId(this->name_);
+  EXPECT_EQ(data.TypeId(), name_and_type.type_id);
+  EXPECT_EQ(data.Name(), name_and_type.name);
+}
 }  // namespace test
-
 }  // namespace maidsafe