diff --git a/Hardware.cs b/Hardware.cs
new file mode 100644
index 0000000..8edc19f
--- /dev/null
+++ b/Hardware.cs
@@ -0,0 +1,171 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.IO;
+using System.Runtime.CompilerServices;
+using System.Threading;
+
+
+/*
+    please QLND-ing 
+*/
+
+
+///////////////////////////////////  TEST ///////////////////////////////////////
+namespace Hardware
+{
+    class HDD {
+
+        static private int  MAX_LENGTH_BYTES = 10;
+
+        //   your path can modify
+        public static string path =
+            @"c:\Users\Home\documents\visual studio 2015\Projects\OS\Hardware\HDD.txt";
+
+        // kaskatelia esi uxaki threadi hamarem senc grel te che amen mi methodi 
+        // mejel karam open cloaase anem  
+        static private  FileStream fs = File.Open(path, FileMode.Open, FileAccess.ReadWrite);
+
+       private  class Write {
+            Write(){}
+
+            public Write(byte[] data, long offset, int length)
+            {
+                this.data = data;
+                this.offset = offset;
+                this.length = length;
+            }
+
+            public byte[] data;
+            public long offset;
+            public int length;
+        }
+
+        public static void ThreadPoolCallbackWrite(Object threadContext)
+        {
+            Write threads = (Write)threadContext;
+            write(threads.data,threads.offset,threads.length);
+        }
+
+        /*
+        MAX_OFFSET = log2(HDD.SIZE)
+        */
+        //[MethodImpl(MethodImplOptions.Synchronized)]
+        public static void write(byte[] data, long offset, int length = -1) {
+
+            if (length == -1) length = data.Length;
+
+            int count = 0;
+            while(length / MAX_LENGTH_BYTES > 1) {
+                byte[] dataX = new byte[MAX_LENGTH_BYTES];
+
+                for (int i = 0; i < MAX_LENGTH_BYTES; i++)
+                 dataX[i] = data[count + i];
+
+                count += MAX_LENGTH_BYTES;
+
+                Write state = new Write(dataX, MAX_LENGTH_BYTES, MAX_LENGTH_BYTES);
+                ThreadPool.QueueUserWorkItem(HDD.ThreadPoolCallbackWrite, (Object)state);
+                length -= MAX_LENGTH_BYTES;
+            }
+
+            // Thread newThread = new Thread(raed);
+            // newThread.Start(data,offset,length);
+            //var fs = File.Open(path,FileMode.Open,FileAccess.Write);
+
+            fs.Seek(offset,SeekOrigin.Begin);
+
+            fs.Write(data, 0, length);
+
+            Console.WriteLine("write "+path);
+           // fs.Close();
+
+        }
+
+        private class Read
+        {
+            Read() { }
+
+            public Read(byte[] data, long offset, int count)
+            {
+                this.data = data;
+                this.offset = offset;
+                this.count = count;
+            }
+
+            public byte[] data;
+            public long offset;
+            public int count;
+        }
+
+        public static void ThreadPoolCallbackRead(Object threadContext)
+        {
+            Read threads = (Read)threadContext;
+            read(ref threads.data, threads.offset, threads.count);
+        }
+
+        /*
+            MAX_OFFSET = log2(HDD.SIZE)
+       */
+        // count <= raed.Length
+        //[MethodImpl(MethodImplOptions.Synchronized)]
+        public static void read(ref byte[] data, long offset, int count) {
+
+            //var fs = File.Open(path,FileMode.Open,FileAccess.Read);
+
+            /*
+                Hl@ chem grel axper asim esqan@ qcem  mi hat qlnges eli )
+            */
+
+            fs.Seek(offset, SeekOrigin.Begin);
+
+            fs.Read(data, 0, count);
+
+            //for test :)
+            for(int i = 0;i<count; i++) Console.WriteLine(data[i]);
+
+            Console.WriteLine("read "+ path);
+            //fs.Close();
+        }
+    }
+
+
+
+
+    class Program
+    {
+        static void Main(string[] args)
+        {
+
+            //int intValue = 13;
+            //byte [] intValueOnByteArray =  BitConverter.GetBytes(intValue);
+
+            byte[] intBytes = new byte[31];
+            for (byte i = 0; i <31; i++) intBytes[i] = i;
+
+            long writeOffset = 0;
+            long readOffset = 0;
+
+            int readCount = 2;
+            intBytes[1] = 115;
+            HDD.write(intBytes, writeOffset);
+            HDD.read(ref intBytes, readOffset, readCount);
+
+
+
+        }
+    }
+
+
+}
+
+
+/*
+31.03.2017
+if you have a question write  kirakosyan0001@gmail.com
+*/
+/*
+please help us
+*/