using System;
using System.IO;
using System.Runtime.InteropServices;
using System.Text;
using Microsoft.Win32.SafeHandles;

namespace ConsoleApplication1
{
    internal class Program
    {
        private static void Main(string[] args)
        {
            long position = 0;
            const int bWidth = 16;
            SafeFileHandle handle = null;

            try
            {
                handle = CreateFile("\\\\.\\PhysicalDrive0", FileAccess.Read, FileShare.Write | FileShare.Read | FileShare.Delete, IntPtr.Zero, FileMode.Open, FileAttributes.System, IntPtr.Zero);

                if (handle.IsInvalid)
                {
                    Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error());
                }

                using (var fs = new FileStream(handle, FileAccess.Read))
                {
                    using (var br = new BinaryReader(fs, Encoding.UTF8))
                    {
                        while (fs.Position < 512)
                        {
                            Console.Write($"{position:X8}    ");

                            var bytes = br.ReadBytes(bWidth);

                            foreach (var b in bytes)
                            {
                                Console.Write($"{b:X2} ");
                            }

                            Console.WriteLine($"    {Encoding.UTF8.GetString(bytes)}");
                            position = fs.Position;
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex);
            }
            finally
            {
                handle?.Close();
            }

            Console.WriteLine("Press any key to close.");
            Console.ReadKey();
        }


        [DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Auto)]
        static extern SafeFileHandle CreateFile(
            string lpFileName,
            [MarshalAs(UnmanagedType.U4)] FileAccess dwDesiredAccess,
            [MarshalAs(UnmanagedType.U4)] FileShare dwShareMode,
            IntPtr lpSecurityAttributes,
            [MarshalAs(UnmanagedType.U4)] FileMode dwCreationDisposition,
            [MarshalAs(UnmanagedType.U4)] FileAttributes dwFlagsAndAttributes,
            IntPtr hTemplateFile);
    }
}