diff --git a/trunk/ConsoleDataMigration/sources/ConsoleBackup/Checker.cpp b/trunk/ConsoleDataMigration/sources/ConsoleBackup/Checker.cpp
index a7c11b8..b28a0ff 100644
--- a/trunk/ConsoleDataMigration/sources/ConsoleBackup/Checker.cpp
+++ b/trunk/ConsoleDataMigration/sources/ConsoleBackup/Checker.cpp
@@ -21,20 +21,73 @@
 namespace ConsoleBackup
 {
 
-bool CheckSaveData()
+namespace
+{
+
+const size_t CHECKER_STACK_SIZE = 0x1000;
+nn::os::Thread s_CheckerThread;
+nn::os::StackBuffer<CHECKER_STACK_SIZE> s_CheckerThreadStackSize;
+nn::Result s_CheckerResult;
+NandSavedataChecker* s_pChecker;
+
+}
+
+s32 GetCheckSaveDataProgress()
+{
+    if(s_pChecker != NULL)
+    {
+        return s_pChecker->GetProgress();
+    }
+    else
+    {
+        return 0;
+    }
+
+}
+
+void CheckSaveDataThreadFunc()
 {
     size_t bufSize = common::GetAllocatableSize();
     common::HeapManager heap(bufSize);
-    if(heap.GetAddr() != NULL)
+    if (heap.GetAddr() != NULL)
     {
-        NandSavedataChecker checker(heap.GetAddr(), bufSize);
-        nn::Result result = checker.CleanUp();
-        return result.IsSuccess();
+        s_pChecker = new NandSavedataChecker(heap.GetAddr(), bufSize);
+        s_CheckerResult = s_pChecker->CleanUp();
     }
+    else
+    {
+        s_CheckerResult = nn::Result(nn::Result::LEVEL_FATAL, nn::Result::SUMMARY_OUT_OF_RESOURCE,
+                nn::Result::MODULE_COMMON, nn::Result::DESCRIPTION_OUT_OF_MEMORY);
 
-    return false;
+    }
+}
+
+void StartSaveDataCheck()
+{
+    s_CheckerThread.Start(CheckSaveDataThreadFunc, s_CheckerThreadStackSize);
+}
+
+bool IsCheckSaveDataFinished()
+{
+    return s_CheckerThread.IsValid() && !s_CheckerThread.IsAlive();
+}
+
+void FinalizeSaveDataCheck()
+{
+    s_CheckerThread.Join();
+    s_CheckerThread.Finalize();
+
+    if(s_pChecker != NULL)
+    {
+        delete s_pChecker;
+    }
+}
+
+bool CheckSaveDataSucceeded()
+{
+    COMMON_LOGGER_RETURN_FALSE_IF_FAILED(s_CheckerResult);
+    return s_CheckerResult.IsSuccess();
 }
 
 }
 
-
diff --git a/trunk/ConsoleDataMigration/sources/ConsoleBackup/Checker.h b/trunk/ConsoleDataMigration/sources/ConsoleBackup/Checker.h
index 102c4d2..8f933df 100644
--- a/trunk/ConsoleDataMigration/sources/ConsoleBackup/Checker.h
+++ b/trunk/ConsoleDataMigration/sources/ConsoleBackup/Checker.h
@@ -19,7 +19,11 @@
 namespace ConsoleBackup
 {
 
-bool CheckSaveData();
+s32 GetCheckSaveDataProgress();
+void StartSaveDataCheck();
+bool IsCheckSaveDataFinished();
+void FinalizeSaveDataCheck();
+bool CheckSaveDataSucceeded();
 
 }
 
diff --git a/trunk/ConsoleDataMigration/sources/ConsoleBackup/Controller.cpp b/trunk/ConsoleDataMigration/sources/ConsoleBackup/Controller.cpp
index 9622df4..8a3e9a4 100644
--- a/trunk/ConsoleDataMigration/sources/ConsoleBackup/Controller.cpp
+++ b/trunk/ConsoleDataMigration/sources/ConsoleBackup/Controller.cpp
@@ -18,6 +18,7 @@
 #include "Exporter.h"
 #include "SimplePlayer.h"
 #include "CommonLogger.h"
+#include "Checker.h"
 
 #include <nn.h>
 
@@ -30,6 +31,7 @@ namespace
 typedef enum BackupState
 {
     STARTUP, // 初期値
+    CHECK_SAVEDATA, // セーブデータの確認
     EXPORT_TWL_NAND, // TWLセーブデータ領域の吸出し中
     EXPORT_TWL_SOUND, // TWLサウンド領域の吸出し中
     EXPORT_TWL_PHOTO, // TWL写真領域の吸出し中
@@ -145,14 +147,41 @@ void ControlState(common::HardwareStateManager& manager, ::std::vector<std::stri
 
         if (nextStep && !error)
         {
-            COMMON_LOGGER("Start Export Data\n");
+            COMMON_LOGGER("Checking SaveData\n");
 
-            s_BackupState = EXPORT_TWL_NAND;
+            s_BackupState = CHECK_SAVEDATA;
         }
     }
     break;
 
 
+    case CHECK_SAVEDATA:
+        {
+            static bool init = true;
+            if (init)
+            {
+                StartSaveDataCheck();
+                init = false;
+            }
+
+            if (IsCheckSaveDataFinished())
+            {
+                FinalizeSaveDataCheck();
+                if (CheckSaveDataSucceeded())
+                {
+                    COMMON_LOGGER("Start Export Data\n");
+
+                    s_BackupState = EXPORT_TWL_NAND;
+                }
+                else
+                {
+                    s_BackupState = FAIL;
+                }
+            }
+        }
+        break;
+
+
     // TWLセーブデータ領域の吸出し中
     case EXPORT_TWL_NAND:
     {
@@ -269,7 +298,7 @@ void ControlState(common::HardwareStateManager& manager, ::std::vector<std::stri
                 {
                     COMMON_LOGGER("Export NAND Data Finished.\n");
 
-                    if (GetProgress() > 99)
+                    if (GetExportProgress() > 99)
                     {
                         s_BackupState = DELETE_NIM;
                     }
@@ -342,6 +371,18 @@ void ControlState(common::HardwareStateManager& manager, ::std::vector<std::stri
     }
 }
 
+u32 GetProgress()
+{
+    if(s_BackupState == CHECK_SAVEDATA)
+    {
+        return GetCheckSaveDataProgress();
+    }
+    else
+    {
+        return GetExportProgress();
+    }
+}
+
 bool InProgress()
 {
     return s_BackupState == EXPORT_CTR_NAND;
diff --git a/trunk/ConsoleDataMigration/sources/ConsoleBackup/Controller.h b/trunk/ConsoleDataMigration/sources/ConsoleBackup/Controller.h
index b60d065..8e0e6ab 100644
--- a/trunk/ConsoleDataMigration/sources/ConsoleBackup/Controller.h
+++ b/trunk/ConsoleDataMigration/sources/ConsoleBackup/Controller.h
@@ -46,6 +46,9 @@ void OnSdEjected();
 // 状態を初期化する
 void InitializeState();
 
+// 進捗を取得する
+u32 GetProgress();
+
 }
 
 #endif /* CONTOROLLER_H_ */
diff --git a/trunk/ConsoleDataMigration/sources/ConsoleBackup/Exporter.cpp b/trunk/ConsoleDataMigration/sources/ConsoleBackup/Exporter.cpp
index ffa4f46..451a2a8 100644
--- a/trunk/ConsoleDataMigration/sources/ConsoleBackup/Exporter.cpp
+++ b/trunk/ConsoleDataMigration/sources/ConsoleBackup/Exporter.cpp
@@ -949,7 +949,7 @@ bool ExportData(common::HardwareStateManager& manager)
     return true;
 }
 
-u32 GetProgress()
+u32 GetExportProgress()
 {
     return common::GetProgress();
 }
diff --git a/trunk/ConsoleDataMigration/sources/ConsoleBackup/Exporter.h b/trunk/ConsoleDataMigration/sources/ConsoleBackup/Exporter.h
index 8f2149d..6b8bdca 100644
--- a/trunk/ConsoleDataMigration/sources/ConsoleBackup/Exporter.h
+++ b/trunk/ConsoleDataMigration/sources/ConsoleBackup/Exporter.h
@@ -43,7 +43,7 @@ bool ExportData(common::HardwareStateManager& manager);
 bool DeleteNimSaveData();
 
 // 出力スレッドの進捗を返す
-u32 GetProgress();
+u32 GetExportProgress();
 
 // 出力スレッドが終了したかどうか
 bool IsExportThreadFinished();
diff --git a/trunk/ConsoleDataMigration/sources/ConsoleBackup/SavedataChecker.cpp b/trunk/ConsoleDataMigration/sources/ConsoleBackup/SavedataChecker.cpp
index addd5e4..f9a1157 100644
--- a/trunk/ConsoleDataMigration/sources/ConsoleBackup/SavedataChecker.cpp
+++ b/trunk/ConsoleDataMigration/sources/ConsoleBackup/SavedataChecker.cpp
@@ -36,7 +36,7 @@ SavedataCheckerBase::SavedataCheckerBase(void* buf, size_t size) :
 
 SavedataCheckerBase::~SavedataCheckerBase()
 {
-    NN_LOG("m_TotalReadSize = %d\n", m_TotalReadSize);
+    NN_LOG("m_TotalReadSize = %lld\n", m_TotalReadSize);
 }
 
 nn::Result SavedataCheckerBase::CleanUpFilesRecursively(bool* modified, std::wstring currentDirectory)
@@ -45,7 +45,7 @@ nn::Result SavedataCheckerBase::CleanUpFilesRecursively(bool* modified, std::wst
     nn::fs::DirectoryEntry entry;
     nn::Result result;
 
-    COMMON_LOGGER("%s\n", common::GetCharStr(currentDirectory.c_str()));
+    NN_LOG("%s\n", common::GetCharStr(currentDirectory.c_str()));
     result = dir.TryInitialize(currentDirectory.c_str());
     if(result.IsFailure())
     {
@@ -92,13 +92,11 @@ nn::Result SavedataCheckerBase::CleanUpFilesRecursively(bool* modified, std::wst
             std::wstring filePath = (currentDirectory + std::wstring(entry.entryName)).c_str();
             const wchar_t* path = filePath.c_str();
 
-            COMMON_LOGGER("%s\n", common::GetCharStr(path));
-
             result = file.TryInitialize(path);
             if(result.IsFailure())
             {
                 nn::dbg::PrintResult(result);
-                COMMON_LOGGER("Cannot Initialize %s, delete.\n", common::GetCharStr(path));
+                COMMON_LOGGER_WARN("Cannot Initialize %s, delete.\n", common::GetCharStr(entry.entryName));
                 result = nn::fs::TryDeleteFile(path);
                 *modified = true;
                 continue;
@@ -108,18 +106,21 @@ nn::Result SavedataCheckerBase::CleanUpFilesRecursively(bool* modified, std::wst
             {
                 s32 readSize;
                 result = file.TryRead(&readSize, m_Buf, m_Bufsize);
-                m_TotalReadSize += readSize;
                 if(result.IsFailure())
                 {
                     nn::dbg::PrintResult(result);
-                    COMMON_LOGGER("Cannot read %s, delete.\n", common::GetCharStr(path));
+                    COMMON_LOGGER_WARN("Cannot read %s, delete.\n", common::GetCharStr(entry.entryName));
+                    m_TotalReadSize += file.GetSize();
                     file.Finalize();
                     result = nn::fs::TryDeleteFile(path);
                     COMMON_LOGGER_RESULT_IF_FAILED(result);
                     *modified = true;
                     break;
                 }
-
+                else
+                {
+                    m_TotalReadSize += readSize;
+                }
 
                 if(readSize == 0)
                 {
@@ -138,7 +139,7 @@ nn::Result SavedataCheckerBase::GetFileSize(std::wstring currentDirectory)
     nn::fs::DirectoryEntry entry;
     nn::Result result;
 
-    COMMON_LOGGER("%s\n", common::GetCharStr(currentDirectory.c_str()));
+    NN_LOG("%s\n", common::GetCharStr(currentDirectory.c_str()));
     result = dir.TryInitialize(currentDirectory.c_str());
     if(result.IsFailure())
     {
@@ -178,8 +179,6 @@ nn::Result SavedataCheckerBase::GetFileSize(std::wstring currentDirectory)
             std::wstring filePath = (currentDirectory + std::wstring(entry.entryName)).c_str();
             const wchar_t* path = filePath.c_str();
 
-            COMMON_LOGGER("%s\n", common::GetCharStr(path));
-
             result = file.TryInitialize(path);
             if(result.IsFailure())
             {
@@ -193,20 +192,15 @@ nn::Result SavedataCheckerBase::GetFileSize(std::wstring currentDirectory)
     return nn::ResultSuccess();
 }
 
-nn::Result SavedataCheckerBase::GetProgress(s32* progress)
+s64 SavedataCheckerBase::GetCalculatedSize()
 {
-    if(m_CalculatedFileSize != 0)
-    {
-        *progress = m_TotalReadSize * 100 / m_CalculatedFileSize;
-    }
-    else
-    {
-        *progress = 0;
-    }
-
-    return nn::ResultSuccess();
+    return m_CalculatedFileSize;
 }
 
+s64 SavedataCheckerBase::GetTotalReadSize()
+{
+    return m_TotalReadSize;
+}
 
 
 NandSavedataChecker::NandSavedataChecker()
@@ -217,38 +211,45 @@ NandSavedataChecker::NandSavedataChecker()
 
 NandSavedataChecker::NandSavedataChecker(void* buf, size_t size) : m_Buf(buf), m_Bufsize(size)
 {
-
+    m_pSharedExtSaveChecker = new SharedExtSavedataChecker(buf, size);
+    m_pSysSaveChecker = new SystemSavedataChecker(buf, size);
 }
 
 NandSavedataChecker::~NandSavedataChecker()
 {
-    // TODO Auto-generated destructor stub
+    delete m_pSharedExtSaveChecker;
+    delete m_pSysSaveChecker;
 }
 
 nn::Result NandSavedataChecker::CleanUp()
 {
     nn::Result result;
 
-    {
-        SharedExtSavedataChecker sharedExtSaveChecker(m_Buf, m_Bufsize);
-        result = sharedExtSaveChecker.CalculateFileSize();
-        NN_UTIL_RETURN_IF_FAILED(result);
-        result = sharedExtSaveChecker.CleanUp();
-        NN_UTIL_RETURN_IF_FAILED(result);
-    }
+    m_pSharedExtSaveChecker->CalculateFileSize();
+    m_pSysSaveChecker->CalculateFileSize();
 
-    {
-        SystemSavedataChecker syssaveChecker(m_Buf, m_Bufsize);
-        result = syssaveChecker.CalculateFileSize();
-        NN_UTIL_RETURN_IF_FAILED(result);
-        result = syssaveChecker.CleanUp();
-        NN_UTIL_RETURN_IF_FAILED(result);
-    }
+    result = m_pSharedExtSaveChecker->CleanUp();
+    COMMON_LOGGER_RETURN_RESULT_IF_FAILED(result);
 
+    result = m_pSysSaveChecker->CleanUp();
+    COMMON_LOGGER_RETURN_RESULT_IF_FAILED(result);
 
     return nn::ResultSuccess();
 }
 
+s64 NandSavedataChecker::GetProgress()
+{
+    if (m_pSharedExtSaveChecker->GetCalculatedSize() == 0 || m_pSysSaveChecker->GetCalculatedSize() == 0)
+    {
+        return 0;
+    }
+    else
+    {
+        return (m_pSharedExtSaveChecker->GetTotalReadSize() + m_pSysSaveChecker->GetTotalReadSize()) * 100
+                / (m_pSharedExtSaveChecker->GetCalculatedSize() + m_pSysSaveChecker->GetCalculatedSize());
+    }
+}
+
 SystemSavedataChecker::SystemSavedataChecker()
 {
 
@@ -302,7 +303,7 @@ nn::Result SystemSavedataChecker::CleanUp()
         }
     }
 
-    return result;
+    return nn::ResultSuccess();
 }
 
 nn::Result SystemSavedataChecker::CalculateFileSize()
@@ -322,7 +323,7 @@ nn::Result SystemSavedataChecker::CalculateFileSize()
         }
     }
 
-    NN_LOG("CalculatedFileSize = %d\n", m_CalculatedFileSize);
+    NN_LOG("CalculatedFileSize = %lld\n", m_CalculatedFileSize);
     return result;
 }
 
@@ -350,7 +351,7 @@ nn::Result SharedExtSavedataChecker::CleanUp()
     bit32 IdArray[ARRAY_SIZE];
 
     result = nn::fs::EnumerateSharedExtSaveData(&numId, IdArray, ARRAY_SIZE);
-    NN_UTIL_RETURN_IF_FAILED(result);
+    COMMON_LOGGER_RETURN_RESULT_IF_FAILED(result);
 
     NN_LOG_DEBUG("ExtData num = %d\n", numId);
     bool modified = false;
@@ -359,28 +360,13 @@ nn::Result SharedExtSavedataChecker::CleanUp()
         if (nn::fs::MountSharedExtSaveData(SHARED_EXT_SAVEDATA_ARCHIVE_NAME, IdArray[i]).IsSuccess())
         {
             NN_LOG("Mount %x\n", IdArray[i]);
-            s64 totalBlockSize;
-            s64 leftBlockSize;
-            s32 blockSize;
-            if (nn::fs::GetSharedExtSaveDataBlockSize(&totalBlockSize, &leftBlockSize, &blockSize, IdArray[i]).IsSuccess())
-            {
-                // アーカイブ内のファイル・ディレクトリをチェックする
-                result = CleanUpFilesRecursively(&modified, L"shext:/");
-                COMMON_LOGGER_RETURN_RESULT_IF_FAILED(result);
 
-                result = nn::fs::Unmount(SHARED_EXT_SAVEDATA_ARCHIVE_NAME);
-                NN_UTIL_RETURN_IF_FAILED(result);
-            }
-            else
-            {
-                // アーカイブごと削除する
-                result = nn::fs::Unmount(SHARED_EXT_SAVEDATA_ARCHIVE_NAME);
-                NN_UTIL_RETURN_IF_FAILED(result);
-
-                result = nn::fs::DeleteSharedExtSaveData(IdArray[i]);
-                COMMON_LOGGER_RETURN_RESULT_IF_FAILED(result);
-            }
+            // アーカイブ内のファイル・ディレクトリをチェックする
+            result = CleanUpFilesRecursively(&modified, L"shext:/");
+            COMMON_LOGGER_RETURN_RESULT_IF_FAILED(result);
 
+            result = nn::fs::Unmount(SHARED_EXT_SAVEDATA_ARCHIVE_NAME);
+            COMMON_LOGGER_RETURN_RESULT_IF_FAILED(result);
         }
         else
         {
@@ -409,7 +395,7 @@ nn::Result SharedExtSavedataChecker::CalculateFileSize()
     bit32 IdArray[ARRAY_SIZE];
 
     result = nn::fs::EnumerateSharedExtSaveData(&numId, IdArray, ARRAY_SIZE);
-    NN_UTIL_RETURN_IF_FAILED(result);
+    COMMON_LOGGER_RETURN_RESULT_IF_FAILED(result);
 
     NN_LOG_DEBUG("ExtData num = %d\n", numId);
     for (s32 i = 0; i < numId; i++ )
@@ -418,14 +404,14 @@ nn::Result SharedExtSavedataChecker::CalculateFileSize()
         if (result.IsSuccess())
         {
             result = GetFileSize(L"shext:/");
-            NN_UTIL_RETURN_IF_FAILED(result);
+            COMMON_LOGGER_RETURN_RESULT_IF_FAILED(result);
 
             result = nn::fs::Unmount(SHARED_EXT_SAVEDATA_ARCHIVE_NAME);
-            NN_UTIL_RETURN_IF_FAILED(result);
+            COMMON_LOGGER_RETURN_RESULT_IF_FAILED(result);
         }
     }
 
-    NN_LOG("CalculatedFileSize = %d\n", m_CalculatedFileSize);
+    NN_LOG("CalculatedFileSize = %lld\n", m_CalculatedFileSize);
     return nn::ResultSuccess();
 }
 
diff --git a/trunk/ConsoleDataMigration/sources/ConsoleBackup/SavedataChecker.h b/trunk/ConsoleDataMigration/sources/ConsoleBackup/SavedataChecker.h
index cabf723..62d93a2 100644
--- a/trunk/ConsoleDataMigration/sources/ConsoleBackup/SavedataChecker.h
+++ b/trunk/ConsoleDataMigration/sources/ConsoleBackup/SavedataChecker.h
@@ -124,6 +124,12 @@ public:
     virtual nn::Result CleanUp() = 0;
     virtual nn::Result CalculateFileSize() = 0;
 
+    //! @return    事前に計算したサイズ
+    s64 GetCalculatedSize();
+
+    //! @return    読み取ったサイズ
+    s64 GetTotalReadSize();
+
 protected:
     //! @brief ファイルとディレクトリを再帰的にチェックする。エラーがあれば削除する
     //! @param[out]    modified    ファイルかディレクトリを削除したかどうか
@@ -134,22 +140,19 @@ protected:
     //! @param[out]    size    ファイルサイズ
     //! @param[in]    currentDirectory    チェックを開始するディレクトリ。スラッシュで終端すること。
     nn::Result GetFileSize(std::wstring currentDirectory);
-
-    //! @brief 進捗を取得する
-    //! @param[out]    progress    0~100で表される進捗
-    nn::Result GetProgress(s32* progress);
-
     //! バッファ
     void* m_Buf;
 
     //! バッファサイズ
     size_t m_Bufsize;
 
+    NN_PADDING4;
+
     //! 事前読み取りサイズ
-    size_t m_CalculatedFileSize;
+    s64 m_CalculatedFileSize;
 
     //! 累計読み取りサイズ
-    size_t m_TotalReadSize;
+    s64 m_TotalReadSize;
 
 };
 
@@ -194,7 +197,12 @@ public:
 
     nn::Result CleanUp();
 
+    s64 GetProgress();
+
 private:
+    SharedExtSavedataChecker* m_pSharedExtSaveChecker;
+    SystemSavedataChecker* m_pSysSaveChecker;
+
     //! バッファ
     void* m_Buf;