diff --git a/src/disk.c b/src/disk.c
index 7b2dd57..49194b5 100644
--- a/src/disk.c
+++ b/src/disk.c
@@ -391,3 +391,13 @@ disk open_disk(char *filename) {
   fclose(fptr);
   return d;
 }
+
+void persist_on_disk(disk* d) {
+  FILE *fptr;
+  fptr = fopen("disk", "wb");
+
+  int n = fwrite(d, sizeof(disk), 1, fptr);
+  if (n != 1) {
+    dprintf(STDERR_FILENO, "Failed to persist datas on disk\n");
+  }
+}
\ No newline at end of file
diff --git a/src/disk.h b/src/disk.h
index 48a7910..c7a3c11 100644
--- a/src/disk.h
+++ b/src/disk.h
@@ -18,4 +18,5 @@ int do_ls(disk *d, char* path);
 int do_touch(disk *d, char *filepath);
 int do_mkdir(disk* d, char *dirpath);
 int do_df(disk *d);
-int find_dir_inode_by_name(char *name, int dir_index, disk *d);
\ No newline at end of file
+int find_dir_inode_by_name(char *name, int dir_index, disk *d);
+void persist_on_disk(disk* d);
\ No newline at end of file
diff --git a/src/exec.c b/src/exec.c
index a4efaec..4429d8b 100644
--- a/src/exec.c
+++ b/src/exec.c
@@ -89,13 +89,15 @@ int do_echo(char **args) {
 
 int child_process_job(disk *d, char **args) {
   if (strcmp("ls", args[0]) == 0) {
-    return do_ls(d, args[1]);
+    do_ls(d, args[1]);
   } else if (strcmp("mkdir", args[0]) == 0) {
-    return do_mkdir(d, args[1]);
+    do_mkdir(d, args[1]);
+    persist_on_disk(d);
   } else if (strcmp("touch", args[0]) == 0) {
-    return do_touch(d, args[1]);
+    do_touch(d, args[1]);
+    persist_on_disk(d);
   } else if (strcmp("df", args[0]) == 0) {
-    return do_df(d);
+    do_df(d);
   } else {
     dprintf(STDERR_FILENO, "%s: no such command\n", args[0]);
   }