C#读磁盘扇区

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Threading;
using System.IO;

namespace SDCardRead
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        public const short FILE_ATTRIBUTE_NORMAL = 0x80;
        public const short INVALID_HANDLE_VALUE = -1;
        public const uint GENERIC_READ = 0x80000000;
        public const uint GENERIC_WRITE = 0x40000000;
        private const uint FILE_SHARE_READ = 0x00000001;
        private const uint FILE_SHARE_WRITE = 0x00000002;
        public const uint CREATE_NEW = 1;
        public const uint CREATE_ALWAYS = 2;
        public const uint OPEN_EXISTING = 3;
        public const uint FILE_BEGIN = 0;
        public const uint FILE_CURRENT = 1;
        public const uint FILE_END = 2; 

        [DllImport("Kernel32.dll")]
        extern static IntPtr CreateFile(string fileName, uint accessFlag, uint shareMode, IntPtr security,
            uint createFlag, uint attributeFlag, IntPtr tempfile);

        [DllImport("Kernel32.dll")]
        extern static bool ReadFile(IntPtr handle, [Out] byte[] buffer, uint bufferLength,
            ref uint length, IntPtr overLapped);

        [DllImport("Kernel32.dll")]
        extern static bool CloseHandle(IntPtr handle);

        [DllImport("Kernel32.dll")]
        extern static uint SetFilePointer(IntPtr handle, uint offset, IntPtr distance, uint flag);

        /// <summary>
        /// Read Disk MBR(Main Boot Record)
        /// </summary>
        /// <returns>512 byte for MBR record</returns>
        public static byte[] ReadMBR(uint SectorIndex)
        {            
            const string SD_CARD_PATH = @"\\.\G:"; // X: 替换为你的SD卡驱动器字母
            IntPtr DiskHandle = CreateFile(
                SD_CARD_PATH,
                GENERIC_READ | GENERIC_WRITE,
                FILE_SHARE_READ | FILE_SHARE_WRITE, 
                IntPtr.Zero, 
                OPEN_EXISTING, 
                0, 
                IntPtr.Zero);

            byte[] buffer = new byte[512];
            uint length = 0;
            SetFilePointer(DiskHandle, SectorIndex, IntPtr.Zero, FILE_BEGIN);
            ReadFile(DiskHandle, buffer,(uint) buffer.Length, ref length, IntPtr.Zero);
            
            CloseHandle(DiskHandle);
            return buffer;
        }     
           
          
    }
}