diff --git a/src/filesys/openfile.rs b/src/filesys/openfile.rs
index 17ff6d6..f77885d 100644
--- a/src/filesys/openfile.rs
+++ b/src/filesys/openfile.rs
@@ -61,11 +61,8 @@ impl OpenFile {
 
         let mut nbr_octet_lu = num_bytes;
         let file_length = file.hdr.file_length(); 
-        let mut first_sector : i32;
-        let mut last_sector : i32;   
-        let mut num_sectors : i32;   
-        let mut start : i32;
-        let mut end : i32; 
+        //on transforme position (position en octets) en un numéro de secteur
+        let sector_position = position/disk::SECTOR_SIZE;
 
         if ( num_bytes <= 0)||( position < 0)||( position >= file_length) {
             return 0;
@@ -74,24 +71,8 @@ impl OpenFile {
         if (position + num_bytes > file_length) {
            nbr_octet_lu = file_length - position; 
         }
-
-        first_sector = div_round_down(position,disk::SECTOR_SIZE);
-        last_sector = div_round_down(position + num_bytes - 1, disk::SECTOR_SIZE);
-        num_sectors = last_sector - first_sector + 1;
-
-        let mut buffer = vec![0_u8; (num_sectors * disk::SECTOR_SIZE) as usize];
-
-        for i in first_sector..(last_sector + 1){
-            
-            DrvDisk::read_sector(driver_disk, i, &mut buffer);
-        }
-
-        start = position%disk::SECTOR_SIZE;
-        end = start + nbr_octet_lu - 1;
-
-        for i in start..(end + 1){
-            into.push(buffer[i as usize]);
-        }
+      
+        DrvDisk::read_multiple_sector(driver_disk, sector_position, &mut into[..]);
 
         nbr_octet_lu
     }
@@ -102,18 +83,12 @@ impl OpenFile {
     num_bytes : nombre d'octets à écrire depuis from
     position : position du premier octet à écrire dans le fichier(header compté??)
      */
-    pub fn write_at(driver_disk : &mut DrvDisk, file : &mut OpenFile, from : &mut Vec<u8>, num_bytes_to_write : i32, position : i32) -> i32 {
+    pub fn write_at(driver_disk : &mut DrvDisk, file : &mut OpenFile, from : &Vec<u8>, num_bytes_to_write : i32, position : i32) -> i32 {
         
         let mut file_length = file.hdr.file_length();
         let mut max_file_length = file.hdr.max_file_length();
-
-        let mut first_sector : i32;
-        let mut last_sector : i32;
-        let mut nbr_sectors : i32;
-
-        let mut first_aligned : bool;
-        let mut last_aligned : bool;
-
+        //on transforme position (position en octets) en un numéro de secteur
+        let sector_position = position/disk::SECTOR_SIZE;
         let mut num_bytes = num_bytes_to_write; //le nombre d'octets que l'on va réellement écrire, on ne pourra pas forcément ecrire la taille demandée en paramètre
 
         if (num_bytes <= 0)||(position < 0) ||(position > file_length){
@@ -140,48 +115,14 @@ impl OpenFile {
         else if position + num_bytes > file_length{
             file.hdr.change_file_length(position + num_bytes);
         }
-
-        first_sector = div_round_down(position, disk::SECTOR_SIZE);
-        last_sector = div_round_down(position + num_bytes - 1, disk::SECTOR_SIZE);
-        nbr_sectors = last_sector + first_sector + 1;
-
-        let mut buffer = vec![0_u8; (nbr_sectors * disk::SECTOR_SIZE) as usize];
-        let mut sector_buffer = vec![0_u8; disk::SECTOR_SIZE as usize];
-
-        first_aligned = position == first_sector*disk::SECTOR_SIZE;//to use
-        last_aligned = position + num_bytes == (last_sector + 1)*disk::SECTOR_SIZE;//to use
-
-        /*
-        A CHANGER
-        les read & write de disk prenant en param des vec, on ne peut pour l'instant pas copier premier et dernier secteur si mauvais alignement
-        par defaut, on reconpie tout les secteur du disk de premier a dernier dans buffer, puis on ecrase avec les données dans from
-         */
-
-        //on recopie tous les secteurs dans buffer
-        for i in first_sector..(last_sector + 1){
-            driver_disk.read_sector(i, &mut buffer)
-        }
-
-        //on ecrase dans buffer avec les données de from
-        let start = position%disk::SECTOR_SIZE;
-        let end = start + num_bytes - 1;
-
-        for i in start..(end + 1){
-            buffer[i as usize] = from[(i-start) as usize];
-        }
-
-        //on ecrit, secteur par secteur, en segmentant buffer en secteurs
-        for i in 0..(nbr_sectors + 1){
-
-            let j = i*disk::SECTOR_SIZE;
-            let k = i + disk::SECTOR_SIZE - 1;
-            //driver_disk.write_sector(i + first_sector, &buffer[i..=k]);
-            //BESOIN DE CHANGER VEC U8 EN SLICE DANS les fonctions read & write de drv_disk & disk
-        }
+       
+        DrvDisk::write_multiple_sector(driver_disk, sector_position, &from[..]);
 
         num_bytes
     }
 
+
+
     pub fn read(driver_disk : &mut DrvDisk, file : &mut OpenFile, into : &mut Vec<u8>, num_bytes : i32) -> i32 {
 
         let result = OpenFile::read_at(driver_disk, file, into, num_bytes, file.seekPosition);
@@ -189,7 +130,9 @@ impl OpenFile {
         result
     }
 
-    pub fn write(driver_disk : &mut DrvDisk, file : &mut OpenFile, from : &mut Vec<u8>, num_bytes : i32) -> i32 {
+
+
+    pub fn write(driver_disk : &mut DrvDisk, file : &mut OpenFile, from : & Vec<u8>, num_bytes : i32) -> i32 {
         
         let result = OpenFile::write_at(driver_disk, file, from, num_bytes, file.seekPosition);
         file.seekPosition += result;
@@ -197,6 +140,7 @@ impl OpenFile {
     }
 
 
+
     pub fn get_name(&self) -> String {
         return self.name.clone();
     }