diff --git a/si/pak.c b/si/pak.c
index 7874290..56ee6ae 100644
--- a/si/pak.c
+++ b/si/pak.c
@@ -109,9 +109,7 @@ uint8_t controller_pak_crc(uint8_t *data) {
 }
 
 void controller_pak_format(uint8_t *ptr) {
-  off_t pos;
-
-  static uint8_t init[] = {
+  static uint8_t init_id_area[] = {
     0x81, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
     0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F,
     0xFF, 0xFF, 0xFF, 0xFF, 0x05, 0x1A, 0x5F, 0x13, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
@@ -128,12 +126,16 @@ void controller_pak_format(uint8_t *ptr) {
     0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x01, 0xFF, 0x66, 0x25, 0x99, 0xCD,
     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-    0x00, 0x71, 0x00, 0x03, 0x00, 0x03, 0x00, 0x03, 0x00, 0x03, 0x00, 0x03, 0x00, 0x03, 0x00, 0x03,
   };
 
-  memcpy(ptr, init, sizeof(init));
-  for (pos = sizeof(init); pos < MEMPAK_SIZE; pos += 2) {
-    ptr[pos+0] = 0x00;
-    ptr[pos+1] = 0x03;
+  memset(ptr, 0, MEMPAK_SIZE);
+  memcpy(ptr, init_id_area, sizeof(init_id_area));
+
+  ptr[(MEMPAK_PAGE_SIZE * 1) + 1] = 0x71;
+  ptr[(MEMPAK_PAGE_SIZE * 2) + 1] = 0x71;
+
+  for (off_t i = 5; i < MEMPAK_NUM_PAGES; i++) {
+    ptr[(MEMPAK_PAGE_SIZE * 1) + (i * 2) + 1] = 0x03;
+    ptr[(MEMPAK_PAGE_SIZE * 2) + (i * 2) + 1] = 0x03;
   }
 }
diff --git a/si/pak.h b/si/pak.h
index 6710960..aa659d8 100644
--- a/si/pak.h
+++ b/si/pak.h
@@ -16,6 +16,8 @@
 #include "gb.h"
 
 #define MEMPAK_SIZE 0x8000
+#define MEMPAK_NUM_PAGES 128
+#define MEMPAK_PAGE_SIZE (MEMPAK_SIZE / MEMPAK_NUM_PAGES)
 
 enum pak_type {
   PAK_NONE = 0,