diff --git a/core-buffer/include/WriterH5Writer.hpp b/core-buffer/include/WriterH5Writer.hpp
index 82ad2e3..08340c5 100644
--- a/core-buffer/include/WriterH5Writer.hpp
+++ b/core-buffer/include/WriterH5Writer.hpp
@@ -6,16 +6,13 @@
 #include <H5Cpp.h>
 #include "buffer_config.hpp"
 
-//// Size of compression header in bytes.
-//const int BSHUF_LZ4_HEADER_BYTES = 12;
-
 struct ImageMetadata
 {
-    uint64_t pulse_id;
-    uint64_t frame_index;
-    uint32_t daq_rec;
-    uint8_t is_good_frame;
-    uint64_t data_n_bytes;
+    uint64_t pulse_id[core_buffer::WRITER_DATA_CACHE_N_IMAGES];
+    uint64_t frame_index[core_buffer::WRITER_DATA_CACHE_N_IMAGES];
+    uint32_t daq_rec[core_buffer::WRITER_DATA_CACHE_N_IMAGES];
+    uint8_t is_good_frame[core_buffer::WRITER_DATA_CACHE_N_IMAGES];
+    uint64_t data_n_bytes[core_buffer::WRITER_DATA_CACHE_N_IMAGES];
 };
 
 class WriterH5Writer {