DriveInformation.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

using System.Runtime.InteropServices;

namespace howto_disk_serial_number
{
    public partial class Form1 : Form
    {
        [DllImport("kernel32.dll")]
        private static extern long GetVolumeInformation(
            string PathName,
            StringBuilder VolumeNameBuffer,
            UInt32 VolumeNameSize,
            ref UInt32 VolumeSerialNumber,
            ref UInt32 MaximumComponentLength,
            ref UInt32 FileSystemFlags,
            StringBuilder FileSystemNameBuffer,
            UInt32 FileSystemNameSize);

        public Form1()
        {
            InitializeComponent();
        }

        private void btnGetInformation_Click(object sender, EventArgs e)
        {
            string drive_letter = txtDisk.Text;
            drive_letter = drive_letter.Substring(0, 1) + ":\\";

            uint serial_number = 0;
               uint max_component_length = 0;

               StringBuilder sb_volume_name = new StringBuilder(256);
               UInt32 file_system_flags = new UInt32();
               StringBuilder sb_file_system_name = new StringBuilder(256);

            if (GetVolumeInformation(drive_letter, sb_volume_name,
                (UInt32)sb_volume_name.Capacity, ref serial_number, ref max_component_length,
                ref file_system_flags, sb_file_system_name, (UInt32)sb_file_system_name.Capacity) == 0)
            {
                MessageBox.Show(
                    "Error getting volume information.",
                    "Error", MessageBoxButtons.OK,
                    MessageBoxIcon.Exclamation);
            } else {
                lblVolumeName.Text = sb_volume_name.ToString();
                lblSerialNumber.Text = serial_number.ToString();
                lblMaxComponentLength.Text = max_component_length.ToString();
                lblFileSystem.Text = sb_file_system_name.ToString();
                lblFlags.Text = "&&H" + file_system_flags.ToString("x");
            }
        }
    }
}