diff --git a/src/drivers/drv_disk.rs b/src/drivers/drv_disk.rs
index 14817b1..3633169 100644
--- a/src/drivers/drv_disk.rs
+++ b/src/drivers/drv_disk.rs
@@ -2,7 +2,7 @@ use crate::Disk;
 
 /// driver disk
 pub struct DrvDisk {
-    disk: Disk
+    disk: Disk,
 }
 
 impl DrvDisk {
@@ -11,34 +11,33 @@ impl DrvDisk {
         DrvDisk { disk: disk }
     }
 
-    ///read inside the disk
-    /// 
+    /// read inside the disk
+    ///
     /// ### Parameters
-	///
-	/// - **self** driver disk
+    ///
+    /// - **self** driver disk
     /// - **sector_number** sector where to read the data
     /// - **data** where the readed data will be stored
-    pub fn read_sector(&mut self, sector_number : i32,  data : &mut Vec<u8>) {
-        match Disk::read_request(&mut self.disk,sector_number, data) {
+    pub fn read_sector(&mut self, sector_number: i32, data: &mut Vec<u8>) {
+        match Disk::read_request(&mut self.disk, sector_number, data) {
             Err(e) => println!("{:?}", e),
-            _ => ()
+            _ => (),
         }
     }
 
-    ///write inside the disk
-    /// 
+    /// write inside the disk
+    ///
     /// ### Parameters
-	///
-	/// - **self** driver disk
+    ///
+    /// - **self** driver disk
     /// - **sector_number** sector where to write the data
     /// - **data** where the data to write is stored
-    pub fn write_sector(&mut self, sector_number : i32, data : &mut Vec<u8>) {
+    pub fn write_sector(&mut self, sector_number: i32, data: &mut Vec<u8>) {
         match Disk::write_request(&mut self.disk, sector_number, data) {
             Err(e) => println!("{:?}", e),
-            _ => ()
+            _ => (),
         }
     }
-
 }
 
 #[cfg(test)]
@@ -58,10 +57,16 @@ mod test {
         let mut drv_disk = DrvDisk::init_drv_disk(disk);
 
         let mut data = Vec::new();
-        data.push(0 as u8); data.push(0 as u8); data.push(0 as u8); data.push(0 as u8);
+        data.push(0 as u8);
+        data.push(0 as u8);
+        data.push(0 as u8);
+        data.push(0 as u8);
 
         let mut data1 = Vec::new();
-        data1.push(1 as u8); data1.push(1 as u8); data1.push(1 as u8); data1.push(1 as u8);
+        data1.push(1 as u8);
+        data1.push(1 as u8);
+        data1.push(1 as u8);
+        data1.push(1 as u8);
 
         let mut data2: Vec<u8> = Vec::new();
 
@@ -69,10 +74,8 @@ mod test {
         drv_disk.write_sector(1, &mut data1);
         drv_disk.read_sector(1, &mut data2);
 
-        assert_eq!(data1,data2);
-        assert_ne!(data,data1);
-        assert_ne!(data,data2);
+        assert_eq!(data1, data2);
+        assert_ne!(data, data1);
+        assert_ne!(data, data2);
     }
-
-    
-}
\ No newline at end of file
+}
diff --git a/src/simulator/disk.rs b/src/simulator/disk.rs
index 8c213c6..17e7d0f 100644
--- a/src/simulator/disk.rs
+++ b/src/simulator/disk.rs
@@ -1,31 +1,37 @@
 use core::panic;
-use std::io;
-use std::io::BufReader;
-use std::io::prelude::*;
 use std::fs::File;
+use std::io;
+use std::io::prelude::*;
 use std::io::SeekFrom;
 
-
-pub const SECTORS_PER_TRACK : i32 = 32;
-pub const NUM_TRACKS : i32 = 64;
-pub const NUM_SECTORS : i32 = SECTORS_PER_TRACK * NUM_TRACKS;
-pub const SECTOR_SIZE : i32 = 4;
+pub const SECTORS_PER_TRACK: i32 = 32;
+pub const NUM_TRACKS: i32 = 64;
+pub const NUM_SECTORS: i32 = SECTORS_PER_TRACK * NUM_TRACKS;
+pub const SECTOR_SIZE: i32 = 4;
 
 pub struct Disk {
-    pub last_selector : i32,
-    pub active : bool
+    pub last_selector: i32,
+    pub active: bool,
 }
 
 impl Disk {
-
     pub fn init_disk() -> Disk {
         Disk {
-            last_selector : 0,
-            active : false
+            last_selector: 0,
+            active: false,
         }
     }
 
-    pub fn read_request(disk : &mut Disk, sector_number : i32, data : &mut Vec<u8>) -> io::Result<()> {
+    /// read data from a disk, at a certain sector number
+    ///
+    /// `panic!` when the disk is already active or the sector number is impossible
+    ///
+    /// ### parameters
+    ///
+    /// - **disk** to read from
+    /// - **sector_number** sector where to read the data
+    /// - **data** where the readed data will be stored
+    pub fn read_request(disk: &mut Disk, sector_number: i32, data: &mut Vec<u8>) -> io::Result<()> {
         if disk.active {
             panic!("Only one request at time");
         }
@@ -34,6 +40,7 @@ impl Disk {
             panic!("sector_number isn't right");
         }
 
+        disk.active = true;
         let mut f = File::open("test/disk.txt")?;
         f.seek(SeekFrom::Start((sector_number * SECTOR_SIZE) as u64))?;
         let mut buffer = [0; SECTOR_SIZE as usize];
@@ -41,37 +48,50 @@ impl Disk {
         for byte in buffer {
             data.push(byte);
         }
+        disk.active = false;
         Ok(())
-        
     }
 
-    pub fn write_request(disk : &mut Disk, sector_number : i32, data : &mut Vec<u8>) -> io::Result<()> {
+    /// write data into a disk, at a certain sector number
+    ///
+    /// `panic!` when the disk is already active or the sector number is impossible
+    ///
+    /// ### parameters
+    ///
+    /// - **disk** to write data into
+    /// - **sector_number** sector where to write the data
+    /// - **data** where the data to write is stored
+    pub fn write_request(
+        disk: &mut Disk,
+        sector_number: i32,
+        data: &mut Vec<u8>,
+    ) -> io::Result<()> {
         if disk.active {
             panic!("Only one request at time");
         }
         if sector_number < 0 || sector_number >= NUM_SECTORS {
             panic!("sector_number isn't right");
         }
-        
+
+        disk.active = true;
         let mut f = File::create("test/disk.txt")?;
         f.seek(SeekFrom::Start((sector_number * SECTOR_SIZE) as u64))?;
         let mut i = 0;
         let mut buff = Vec::new();
         for value in data {
             buff.push(*value);
-            i = i+1;
+            i = i + 1;
             if i >= SECTOR_SIZE {
                 break;
             }
-        }    
+        }
 
         let res = f.write(&buff);
         match res {
             Ok(_) => println!("Data written successfully"),
             Err(e) => println!("{:?}", e),
-                _ => ()
-        }  
+        }
+        disk.active = false;
         Ok(())
     }
-
-}
\ No newline at end of file
+}