diff --git a/core-buffer/include/formats.hpp b/core-buffer/include/formats.hpp
index d35c056..ef3a9fb 100644
--- a/core-buffer/include/formats.hpp
+++ b/core-buffer/include/formats.hpp
@@ -6,11 +6,11 @@
 
 struct ImageMetadataBuffer
 {
-    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_image[core_buffer::WRITER_DATA_CACHE_N_IMAGES];
-    uint16_t n_images;
+    uint64_t pulse_id[core_buffer::BUFFER_BLOCK_SIZE];
+    uint64_t frame_index[core_buffer::BUFFER_BLOCK_SIZE];
+    uint32_t daq_rec[core_buffer::BUFFER_BLOCK_SIZE];
+    uint8_t is_good_image[core_buffer::BUFFER_BLOCK_SIZE];
+    uint64_t start_pulse_id;
 };
 
 const char BUFFER_FORMAT_START_BYTE = 0xBE;