diff --git a/ClassData.h b/ClassData.h
index a25af18..b6c4e54 100644
--- a/ClassData.h
+++ b/ClassData.h
@@ -55,6 +55,7 @@ class Data{
     void ClearTriggerRate();
     
     void SaveBuffer(const char * fileName);
+    unsigned int GetPresentFileSize() {return presentFileSizeByte;}
     
     void PrintBuffer(); //Incorrect
     void DecodeBuffer(bool fastDecode, int verbose = 0);
@@ -78,6 +79,7 @@ class Data{
     int DecodePHADualChannelBlock(unsigned int ChannelMask, bool fastDecode, int verbose);
     int DecodePSDDualChannelBlock(unsigned int ChannelMask, bool fastDecode, int verbose);
     
+    unsigned int  presentFileSizeByte;
     unsigned short saveFileIndex;
     
 };
@@ -157,7 +159,9 @@ inline void Data::SaveBuffer(const char * fileName){
   }
   
   fwrite(buffer, nByte, 1, haha);
-  
+
+  presentFileSizeByte = ftell(haha);
+
   fclose(haha);
 }
 
diff --git a/FSUDAQ.cpp b/FSUDAQ.cpp
index 6865f3a..758700e 100644
--- a/FSUDAQ.cpp
+++ b/FSUDAQ.cpp
@@ -212,7 +212,7 @@ MainWindow::MainWindow(const TGWindow *p,UInt_t w,UInt_t h) {
   
   /// setup thread
   //saveDataThread = new TThread("hahaha", SaveData, (void *) 1);
-  fillHistThread = new TThread("kakaka", FillHistogram, (void *) 1);
+  fillHistThread = new TThread("kakaka", RunThread, (void *) 1);
   
   boardSetting = NULL;
   channelSettingPHA = NULL;
@@ -571,6 +571,14 @@ void MainWindow::OpenChannelSetting(Int_t boardID){
   }
 }
 
+//TODO, should merge into LogMsg.
+void MainWindow::UpdateChannelSetting(){
+  if( digi == NULL ) return;
+  
+  if( channelSettingPHA != NULL ) channelSettingPHA->ChangeCh();
+  if( channelSettingPSD != NULL ) channelSettingPSD->ChangeCh();  
+}
+
 void MainWindow::LogMsg(char * msg){
   
   time_t now = time(0);
@@ -708,7 +716,7 @@ void MainWindow::FitTrace(){
 }
 
 //TODO use the ptr to tell which board, and each digitizer has an indivual thread for savign data and filling hists.
-void * MainWindow::FillHistogram(void * ptr){
+void * MainWindow::RunThread(void * ptr){
   printf("=== %s\n", __func__); 
   
   if( digi == NULL ) return 0;
@@ -722,13 +730,14 @@ void * MainWindow::FillHistogram(void * ptr){
   uint32_t CurrentTime = 0;
   uint32_t ElapsedTime = 0;
   
-  TString dataFileName = dataPrefix->GetText();
+  TString dataFileName = ProgramSetting::DataSavingPath + dataPrefix->GetText();
   dataFileName += Form("_run%03d_%03d", (int) runIDEntry->GetNumber(), (int) digi[boardID]->GetSerialNumber());
   
   printf("|%s|\n", dataFileName.Data());
   
   Data * data = digi[boardID]->GetData();
-  data->AllocateMemory();
+  unsigned int bufferSize = digi[boardID]->CalByteForBuffer();
+  data->AllocateMemory(bufferSize);
   
   while(digi[boardID]->IsRunning()){
     
@@ -746,6 +755,7 @@ void * MainWindow::FillHistogram(void * ptr){
       if( cbMode->GetSelected() == Mode_DataRun ){
         // Rate graph?
         data->SaveBuffer(dataFileName.Data());
+        LogMsg((char *) Form("File Size : %.2f MB", data->GetPresentFileSize() / 1024./1024. );
         
       }else{
         
diff --git a/FSUDAQ.h b/FSUDAQ.h
index 3c6c2d7..ad7c140 100644
--- a/FSUDAQ.h
+++ b/FSUDAQ.h
@@ -88,7 +88,7 @@ public:
   void StartRun();
   void StopRun();
 
-  static void * FillHistogram(void * ptr); /// thread
+  static void * RunThread(void * ptr); /// thread
 
   void PlotSingleTrace();
   void FitTrace();
@@ -96,6 +96,7 @@ public:
   void Oscilloscope();
 
   void OpenChannelSetting(Int_t);   
+  void UpdateChannelSetting();
   void LogMsg(char * );
   void GoodBye();
 
diff --git a/boardSetting.cpp b/boardSetting.cpp
index 8d90394..46ea4e0 100644
--- a/boardSetting.cpp
+++ b/boardSetting.cpp
@@ -360,6 +360,13 @@ BoardSetting::BoardSetting(const TGWindow *p, UInt_t w, UInt_t h, Digitizer ** d
     cbFanCtrl->Resize(100, 20);
     cbFanCtrl->Connect("Changed()", "BoardSetting", this, "SetFanSpeedControl()");
 
+    TGVerticalFrame * vBdCfga_haha = new TGVerticalFrame(hframeBdCfg3); hframeBdCfg3->AddFrame(vBdCfga_haha, new TGLayoutHints( kLHintsLeft, 5, 5, 10, 0) );
+    
+    TGLabel * lbBufferSize = new TGLabel(vBdCfga_haha, "Buffer Size [MByte]", kHorizontalFrame); vBdCfga_haha->AddFrame(lbBufferSize, kaka); 
+    txtBufferSize = new TGTextEntry(vBdCfga_haha, ""); vBdCfga_haha->AddFrame(txtBufferSize);
+    txtBufferSize->SetEnabled(false);
+    txtBufferSize->Resize(100, 20);
+
   }
     
   {///========== ACQ control
@@ -905,6 +912,8 @@ void BoardSetting::ChangeBoard(){
   cbAggOrg->Select( digi[boardID]->GetSettingFromMemory(Register::DPP::AggregateOrganization) , false);
   numAggBLT->SetNumber( digi[boardID]->GetSettingFromMemory(Register::DPP::MaxAggregatePerBlockTransfer) , false);
   
+  FillBufferSizeTextBox();
+  
   if( digi[boardID]->GetNChannel() == 8 ){
     ///FAN Speed control only for desktop version
     cbFanCtrl->SetEnabled(true);
@@ -1139,6 +1148,10 @@ void BoardSetting::Haha(Int_t boardID){ /// this is for sending signal to mainwi
   Emit("Haha(Int_t)", boardID);
 }
 
+void BoardSetting::TellChannelSettingtoUpdate(){
+  Emit("TellChannelSettingtoUpdate()");
+}
+
 void BoardSetting::ResetSettingToDefault(){  /// same for PHA and PSD
   printf("=== %s\n", __func__);
   
@@ -1218,6 +1231,7 @@ void BoardSetting::SetAggregateOrganization(){  /// same for PHA and PSD
   int boardID = boardIDEntry->GetNumber();  
   digi[boardID]->WriteRegister(Register::DPP::AggregateOrganization, cbAggOrg->GetSelected());
   
+  FillBufferSizeTextBox();
 }
 
 void BoardSetting::SetReadOutAggregate(){  /// same for PHA and PSD
@@ -1226,6 +1240,8 @@ void BoardSetting::SetReadOutAggregate(){  /// same for PHA and PSD
   if( digi == NULL ) return;
   int boardID = boardIDEntry->GetNumber();  
   digi[boardID]->WriteRegister(Register::DPP::MaxAggregatePerBlockTransfer, (unsigned int) numAggBLT->GetNumber());
+
+  FillBufferSizeTextBox();
   
 }
 
@@ -1487,7 +1503,7 @@ void BoardSetting::SaveSettingFile(){
   
   const char *filetypes[] = { "Setting File", "*.bin", 
                               0, 0};
-  
+                              
   static TString dir(".");
   TGFileInfo fi;
   fi.fFileTypes = filetypes;
@@ -1504,10 +1520,15 @@ void BoardSetting::SaveSettingFile(){
   if( digi == NULL ) {
     
   }else{
-    
     int boardID = boardIDEntry->GetNumber();  
     digi[boardID]->OpenSettingBinary( fi.fFilename );
-    
   }
   
 }
+
+void BoardSetting::FillBufferSizeTextBox(){
+  if( digi == NULL ) return;
+  int boardID = boardIDEntry->GetNumber();  
+  uint32_t buffer = digi[boardID]->CalByteForBuffer();
+  txtBufferSize->SetText(Form("%.2f", buffer/1024./1024.));
+}
diff --git a/boardSetting.h b/boardSetting.h
index 88539e5..38d6a3c 100644
--- a/boardSetting.h
+++ b/boardSetting.h
@@ -52,6 +52,8 @@ class BoardSetting{
     TGNumberEntry * numAggBLT; /// number of Agg pre Block transfer
     TGComboBox * cbFanCtrl;
 
+    TGTextEntry * txtBufferSize;
+
     /// ACQ control
     TGComboBox * cbAcqMode;
     TGCheckButton * bAcqArm;
@@ -177,11 +179,17 @@ class BoardSetting{
 
     ///==== Others
     void LogMsg(TString msg); // *SIGNAL*
-    void Haha(Int_t boardID); // *SIGNAL*
+    /// Haha is for sending signal to mainwindow to open channel setting for the board
+    void Haha(Int_t boardID); // *SIGNAL*  
+    /// this send signal to MainWindows, and tell channel setting to update
+    //TODO to merge to LogMsg
+    void TellChannelSettingtoUpdate(); // *SIGNAL*
 
     void ReadData();
     void ProgramDefaultBoard();
     void ProgramBoardFromFile();
     void SaveSettingFile();
+
+    void FillBufferSizeTextBox();
 };
 #endif
diff --git a/channelSettingPHA.cpp b/channelSettingPHA.cpp
index 5137534..c9d591b 100644
--- a/channelSettingPHA.cpp
+++ b/channelSettingPHA.cpp
@@ -23,7 +23,7 @@ ChannelSettingPHA::ChannelSettingPHA(const TGWindow *p, UInt_t w, UInt_t h, Digi
   fMain->SetWindowName("Channel Settings PHA");
   fMain->Connect("CloseWindow()", "ChannelSettingPHA", this, "CloseWindow()");
 
-  TGLayoutHints * layoutHintsR = new TGLayoutHints(kLHintsRight, 5,5,3,2); /// left, right, top, bottom  
+  TGLayoutHints * layoutHintsR = new TGLayoutHints(kLHintsRight, 5,5,3,3); /// left, right, top, bottom  
   TGLayoutHints * layoutHints = new TGLayoutHints(kLHintsCenterX | kLHintsCenterY, 5,5,0,0); /// left, right, top, bottom
   
   TGVerticalFrame * vframe = new TGVerticalFrame(fMain);
@@ -118,6 +118,11 @@ ChannelSettingPHA::ChannelSettingPHA(const TGWindow *p, UInt_t w, UInt_t h, Digi
     numEventAgg->SetLimits(TGNumberFormat::kNELLimitMinMax, 0, 511);
     numEventAgg->Connect("Modified()", "ChannelSettingPHA", this, "SetEventAggregate()"); 
     
+    TGLabel * lbBuffer = new TGLabel(vfInput1, "Buffer Size [MByte]"); vfInput1->AddFrame(lbBuffer, layoutHintsR);
+    eBuffer = new TGTextEntry(vfInput2,""); vfInput2->AddFrame(eBuffer, layoutHints);
+    eBuffer->Resize(width, 20);
+    eBuffer->SetEnabled(false);
+    
     ///const uint32_t ChannelDCOffset            = 0x1098; /// R/W
     TGLabel * lbDCOffset = new TGLabel(vfInput1, "DC offset [%]"); vfInput1->AddFrame(lbDCOffset, layoutHintsR);
     numDCOffset = new TGNumberEntry(vfInput2, 20, 0, 0, TGNumberFormat::kNESRealTwo, TGNumberFormat::kNEANonNegative); vfInput2->AddFrame(numDCOffset, layoutHints);
@@ -680,6 +685,10 @@ void ChannelSettingPHA::SetEventAggregate()  {
   short ch = chIDEntry->GetNumber();
   unsigned int temp = numEventAgg->GetNumber();
   if( digi != NULL ) digi[boardID]->WriteRegister(Register::DPP::NumberEventsPerAggregate_G, temp , ch);
+  
+  uint32_t buffer = digi[boardID]->CalByteForBuffer();
+  eBuffer->SetText(Form("%.2f", buffer/1024./1024.));
+  
 }
 
 
diff --git a/channelSettingPHA.h b/channelSettingPHA.h
index dff4919..c200171 100644
--- a/channelSettingPHA.h
+++ b/channelSettingPHA.h
@@ -28,7 +28,7 @@ class ChannelSettingPHA{
     TGNumberEntry * numRecordLength;
     TGNumberEntry * numPreTrigger;
     TGNumberEntry * numEventAgg;
-
+    TGTextEntry  * eBuffer ;
 
     TGNumberEntry * numTriggerThreshold;
     TGNumberEntry * numTriggerHoldOff;
diff --git a/programSetting.cpp b/programSetting.cpp
index a5ea67c..d84501c 100644
--- a/programSetting.cpp
+++ b/programSetting.cpp
@@ -11,6 +11,7 @@
 
 std::string ProgramSetting::IP = "http://fsunuc.physics.fsu.edu/influx/";
 std::string ProgramSetting::databaseName = "testing";
+std::string ProgramSetting::DataSavingPath = "/home/catrina/FSUDAQ/";
 
 ProgramSetting::ProgramSetting(const TGWindow *p){
   fMain = new TGMainFrame(p, 600, 400);
@@ -20,7 +21,7 @@ ProgramSetting::ProgramSetting(const TGWindow *p){
   TGVerticalFrame * vframe = new TGVerticalFrame(fMain); fMain->AddFrame(vframe); 
   
   {///============== Database
-    TGGroupFrame *  gfDatabase = new TGGroupFrame(vframe, "Database Setting", kHorizontalFrame); vframe->AddFrame(gfDatabase, new TGLayoutHints(kLHintsExpandY, 5, 5, 5, 5));  
+    TGGroupFrame *  gfDatabase = new TGGroupFrame(vframe, "Database Setting", kHorizontalFrame); vframe->AddFrame(gfDatabase, new TGLayoutHints(kLHintsExpandY | kLHintsExpandX , 5, 5, 5, 5));  
     
     TGVerticalFrame * vfDB = new TGVerticalFrame(gfDatabase); gfDatabase->AddFrame(vfDB);
 
@@ -37,6 +38,18 @@ ProgramSetting::ProgramSetting(const TGWindow *p){
     
   }
   
+  {///============== Data Saving Path
+    TGGroupFrame *  gfData = new TGGroupFrame(vframe, "Data Storage", kHorizontalFrame); vframe->AddFrame(gfData, new TGLayoutHints(kLHintsExpandY | kLHintsExpandY , 5, 5, 5, 5));  
+    
+    TGVerticalFrame * vfData = new TGVerticalFrame(gfData); gfData->AddFrame(vfData);
+    
+    TGHorizontalFrame * hfData = new TGHorizontalFrame(vfData); vfData->AddFrame(hfData);    
+    TGLabel * lbDataPath = new TGLabel(hfData, "Data Absolute Path :"); hfData->AddFrame(lbDataPath, new TGLayoutHints(kLHintsLeft | kLHintsCenterY, 5,5,3,3));
+    txtDataPath = new TGTextEntry(hfData, DataSavingPath.c_str()); hfData->AddFrame(txtDataPath, new TGLayoutHints(kLHintsLeft | kLHintsCenterY, 5,5,3,3));
+    txtDataPath->Connect("ReturnPressed()", "ProgramSetting", this, "SetDataPath()");
+    txtDataPath->Resize(300, 20);
+  }
+  
   {///============== Read Time event building
     
     
@@ -65,3 +78,11 @@ void ProgramSetting::SetDataBase(){
   printf("Name: %s\n", databaseName.c_str());
   
 }
+
+void ProgramSetting::SetDataPath(){
+  
+  DataSavingPath = txtDataPath->GetText();
+  
+  printf("DataSavingPath : %s\n", DataSavingPath.c_str());
+  
+}
diff --git a/programSetting.h b/programSetting.h
index 87b735e..9b8eaba 100644
--- a/programSetting.h
+++ b/programSetting.h
@@ -22,6 +22,7 @@ class ProgramSetting{
     
     TGTextEntry * txtIP;
     TGTextEntry * txtDBName;
+    TGTextEntry * txtDataPath;
 
   public:
     ProgramSetting(const TGWindow *p);
@@ -31,8 +32,10 @@ class ProgramSetting{
 
     static std::string IP;
     static std::string databaseName;
+    static std::string DataSavingPath;
 
     void SetDataBase();
+    void SetDataPath();
 };
 
 #endif