diff --git a/src/const.h b/src/const.h
index 0bad2d1..0749a3c 100644
--- a/src/const.h
+++ b/src/const.h
@@ -1 +1,8 @@
-#define BUFSIZE 1024
\ No newline at end of file
+#define BUFSIZE 1024
+#define MAX_BLOCS_PER_INODE 30
+#define MAX_BYTES_PER_BLOC 1024
+
+#define FILE 0
+#define BINARY 1
+#define DIRECTORY 2
+#define SYMBOLIC_LINK 3
\ No newline at end of file
diff --git a/src/struct.h b/src/struct.h
new file mode 100644
index 0000000..0a2c229
--- /dev/null
+++ b/src/struct.h
@@ -0,0 +1,20 @@
+#pragma once
+#include "const.h"
+
+typedef struct inode {
+  char perms[8]; // rwxrwxrwx
+  char filetype; // d, -, l
+  int blocs[MAX_BLOCS_PER_INODE];
+} inode;
+
+typedef struct bloc {
+  char datas[MAX_BYTES_PER_BLOC];
+} bloc;
+
+typedef struct disk {
+  inode inodes[10];
+  bloc blocs[30];
+} disk;
+
+// pour 10 inode qui a 30 blocs de chacun 1024 octets, on a 307200 octets, soit
+// 307,2 Ko sur le disque
\ No newline at end of file