diff --git a/slsReceiverSoftware/src/DataProcessor.cpp b/slsReceiverSoftware/src/DataProcessor.cpp
index 700561924..b97da54df 100644
--- a/slsReceiverSoftware/src/DataProcessor.cpp
+++ b/slsReceiverSoftware/src/DataProcessor.cpp
@@ -213,7 +213,9 @@ void DataProcessor::CreateVirtualFile(
     if (virtualFile_) {
         delete virtualFile_;
     }
-    virtualFile_ = new HDF5VirtualFile(hdf5Lib);
+    gotthard25um = ((detectorType_ == GOTTHARD || detectorType_ == GOTTHARD2) &&
+                    (numModX * numModY) == 2);
+    virtualFile_ = new HDF5VirtualFile(hdf5Lib, gotthard25um);
 
     uint64_t numImagesProcessed = GetProcessedIndex() + 1;
     // maxframesperfile = 0 for infinite files
diff --git a/slsReceiverSoftware/src/HDF5VirtualFile.cpp b/slsReceiverSoftware/src/HDF5VirtualFile.cpp
index 71ef51099..8349291b9 100644
--- a/slsReceiverSoftware/src/HDF5VirtualFile.cpp
+++ b/slsReceiverSoftware/src/HDF5VirtualFile.cpp
@@ -5,8 +5,8 @@
 
 #include <iomanip>
 
-HDF5VirtualFile::HDF5VirtualFile(std::mutex *hdf5Lib)
-    : File(HDF5), hdf5Lib_(hdf5Lib) {}
+HDF5VirtualFile::HDF5VirtualFile(std::mutex *hdf5Lib, bool g25)
+    : File(HDF5), hdf5Lib_(hdf5Lib), gotthard25um(g25) {}
 
 HDF5VirtualFile::~HDF5VirtualFile() { CloseFile(); }
 
diff --git a/slsReceiverSoftware/src/HDF5VirtualFile.h b/slsReceiverSoftware/src/HDF5VirtualFile.h
index a479bce2d..89b1c0b60 100644
--- a/slsReceiverSoftware/src/HDF5VirtualFile.h
+++ b/slsReceiverSoftware/src/HDF5VirtualFile.h
@@ -9,7 +9,7 @@
 class HDF5VirtualFile : private virtual slsDetectorDefs, public File {
 
   public:
-    HDF5VirtualFile(std::mutex *hdf5Lib);
+    HDF5VirtualFile(std::mutex *hdf5Lib, bool g25);
     ~HDF5VirtualFile();
 
     std::array<std::string, 2> GetFileAndDatasetName() const override;
@@ -30,4 +30,5 @@ class HDF5VirtualFile : private virtual slsDetectorDefs, public File {
     H5File *fd_{nullptr};
     std::string fileName_;
     std::string dataSetName_;
+    bool gotthard25um;
 };
\ No newline at end of file