diff --git a/writer/HDF5NXmx.cpp b/writer/HDF5NXmx.cpp
index 86ab79b0..605ffdae 100644
--- a/writer/HDF5NXmx.cpp
+++ b/writer/HDF5NXmx.cpp
@@ -371,6 +371,21 @@ void NXmx::Detector(const StartMessage &start) {
 }
 
 void NXmx::Detector(const StartMessage &start, const EndMessage &end) {
+    hsize_t total_images = end.max_image_number;
+    hsize_t width = start.image_size_x;
+    hsize_t height = start.image_size_y;
+
+    if (start.file_format == FileWriterFormat::NXmxLegacy) {
+        auto data_dataset = VDS(start,
+                                    "/entry/instrument/detector/data",
+                                    {total_images, height, width},
+                                    HDF5DataType(start.bit_depth_image / 8, start.pixel_signed));
+        data_dataset->Attr("image_nr_low", (int32_t) 1)
+                .Attr("image_nr_high",(int32_t) total_images);
+    } else {
+        hdf5_file->HardLink("/entry/data/data", "/entry/instrument/detector/data");
+    }
+
     if (start.images_per_trigger.has_value() && start.images_per_trigger.value() > 0) {
         SaveScalar(*hdf5_file, "/entry/instrument/detector/detectorSpecific/nimages", start.images_per_trigger.value());
         SaveScalar(*hdf5_file, "/entry/instrument/detector/detectorSpecific/ntrigger", (end.max_image_number + start.images_per_trigger.value() - 1)/ start.images_per_trigger.value());