Get USB drive physical location and volumes using c#

Question

I´m trying to obtain the physical location of each USB drive or USB HDD connected to my personal computer and corresponding volume letters (drive letters). From google I just obtained the location information using the next code from MSDN using device.LocationInfo like Port_#0001.Hub_#0003. With Hub referencing the hub the USB Drive is connected to, and Port the port used in it.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;

namespace GetUsbHubPort
{
    class Program
    {
        static void Main(string[] args)
        {
            var deviceTree = new DeviceTree();

            foreach (var deviceClass in Win32.DeviceClasses)
            {
                Console.WriteLine("\n{0}:", deviceClass.Value);

                foreach (var device in deviceTree.DeviceNodes
                    .Where(d => d.ClassGuid == deviceClass.Key))
                {
                    Console.WriteLine(
                        "\t{1}: {0}",
                        device.Description,
                        device.EnumeratorName);
                }
            }

            Console.Write("\n\nAny key...");
            Console.ReadKey();

        }
    }

    public class DeviceTree : IDisposable
    {
        private IntPtr _machineHandle = IntPtr.Zero;
        private IntPtr _rootDeviceHandle = IntPtr.Zero;
        private DeviceNode _rootNode;

        // flat collection of all devices found
        private List<DeviceNode> _deviceNodes;

        public DeviceNode RootNode
        {
            get
            {
                return this._rootNode;
            }
        }

        public List<DeviceNode> DeviceNodes
        {
            get
            {
                return this._deviceNodes;
            }
        }

        public DeviceTree()
        {
            EnumerateDevices();
        }

        ~DeviceTree()
        {
            this.Dispose(false);
        }

        public void Dispose()
        {
            this.Dispose(true);
            GC.SuppressFinalize(this);
        }

        protected virtual void Dispose(bool disposing)
        {
            if (disposing)
            {
                this._deviceNodes.Clear();
            }

            this.DisconnectFromMachine();
        }

        private void EnumerateDevices()
        {
            this.DisconnectFromMachine();

            // local machine assumed
            if (Win32.CM_Connect_Machine(
                null, ref this._machineHandle) != 0)
            {
                return;
            }

            try
            {
                Win32.CM_Locate_DevNode_Ex(
                    ref this._rootDeviceHandle,
                    0,
                    0,
                    this._machineHandle);

                // recursive enumeration
                this._rootNode = new DeviceNode(
                    this._rootDeviceHandle,
                    null,
                    this._machineHandle);
            }
            finally
            {
                this.DisconnectFromMachine();

                if (this._rootNode != null)
                {
                    this._deviceNodes = this._rootNode
                        .Flatten(node => node.Children).ToList();
                }
            }
        }

        private void DisconnectFromMachine()
        {
            if (this._machineHandle != IntPtr.Zero)
            {
                Win32.CM_Disconnect_Machine(this._machineHandle);
                this._machineHandle = IntPtr.Zero;
            }
        }
    }

    public class DeviceNode : IDisposable
    {
        private readonly DeviceNode _parentDevice;
        private readonly List<DeviceNode> _children;
        private readonly IntPtr _deviceHandle;
        private readonly IntPtr _machineHandle;

        private readonly Dictionary<int, string>
            _deviceProperties;

        public DeviceNode ParentDevice
        {
            get
            {
                return _parentDevice;
            }
        }

        public Dictionary<int, string> DeviceProperties
        {
            get
            {
                return _deviceProperties;
            }
        }

        public List<DeviceNode> Children
        {
            get
            {
                return this._children;
            }
        }

        public Guid ClassGuid
        {
            get
            {
                string buffer =
                    this.GetProperty(Win32.DevRegProperty.ClassGuid);

                var guid = new Guid();

                if (buffer.Length >= 32)
                {
                    try
                    {
                        guid = new Guid(buffer);
                    }
                    catch
                    {
                        guid = new Guid();
                    }
                }

                return guid;
            }
        }

        public string Description
        {
            get
            {
                return
                    GetProperty(Win32.DevRegProperty.DeviceDescription);
            }
        }

        public string FriendlyName
        {
            get
            {
                return
                    GetProperty(Win32.DevRegProperty.FriendlyName);
            }
        }

        public string EnumeratorName
        {
            get
            {
                return
                    GetProperty(Win32.DevRegProperty.EnumeratorName);
            }
        }

        public string LocationInfo
        {
            get
            {
                return
                    GetProperty(Win32.DevRegProperty.LocationInfo);
            }
        }

        public DeviceNode(IntPtr deviceHandle, DeviceNode parentDevice)
            : this(
                    deviceHandle,
                    parentDevice,
                    parentDevice._machineHandle)
        {
        }

        public DeviceNode(
            IntPtr deviceHandle,
            DeviceNode parentDevice,
            IntPtr machineHandle)
        {
            _deviceProperties = new Dictionary<int, string>();
            _children = new List<DeviceNode>();

            _deviceHandle = deviceHandle;
            _machineHandle = machineHandle;
            _parentDevice = parentDevice;

            EnumerateDeviceProperties();
            EnumerateChildren();
        }

        private string GetProperty(
            Win32.DevRegProperty devRegProperty)
        {
            return GetProperty((int)devRegProperty);
        }

        private string GetProperty(int index)
        {
            string buffer;
            var result = this._deviceProperties
                .TryGetValue(index, out buffer);
            return result ? buffer : string.Empty;
        }

        private void EnumerateDeviceProperties()
        {
            for (var index = 0; index < 64; index++)
            {
                uint bufsize = 2048;

                IntPtr buffer =
                    Marshal.AllocHGlobal((int)bufsize);

                var result =
                    Win32.CM_Get_DevNode_Registry_Property_Ex(
                        _deviceHandle,
                        index,
                        IntPtr.Zero,
                        buffer,
                        ref bufsize,
                        0,
                        _machineHandle);

                var propertyString = result == 0
                    ? Marshal.PtrToStringAnsi(buffer)
                    : string.Empty;

                _deviceProperties.Add(index, propertyString);

                Marshal.FreeHGlobal(buffer);
            }
        }

        private void EnumerateChildren()
        {
            IntPtr ptrFirstChild = IntPtr.Zero;

            if (Win32.CM_Get_Child_Ex(
                ref ptrFirstChild,
                _deviceHandle,
                0,
                _machineHandle) != 0)
            {
                return;
            }

            var ptrChild = ptrFirstChild;
            var ptrSibling = IntPtr.Zero;

            do
            {
                var childDevice = new DeviceNode(ptrChild, this);
                _children.Add(childDevice);

                if (Win32.CM_Get_Sibling_Ex(
                    ref ptrSibling,
                    ptrChild,
                    0,
                    _machineHandle) != 0) break;

                ptrChild = ptrSibling;
            }
            while (true);
        }

        public void Dispose()
        {
            this.Dispose(true);
            GC.SuppressFinalize(this);
        }

        protected virtual void Dispose(bool disposing)
        {
            if (disposing)
            {
                _deviceProperties.Clear();
            }
        }
    }

    internal static class LinqExtensionMethods
    {
        public static IEnumerable<T> Return<T>(T element)
        {
            yield return element;
        }

        public static IEnumerable<T> StartWith<T>(
            this IEnumerable<T> list, T element)
        {
            return Return(element).Concat(list);
        }

        public static IEnumerable<TEntity> Flatten<TEntity>(
            this TEntity element,
            Func<TEntity, IEnumerable<TEntity>> childSelector)
        {
            if (childSelector(element) != null)
                return childSelector(element)
                    .SelectMany(child => child.Flatten(childSelector))
                    .StartWith(element);

            var items = new List<TEntity> { element };
            return items;
        }
    }

    public static class Win32
    {
        // this is a partial list
        public static readonly
            Dictionary<Guid, string> DeviceClasses =
            new Dictionary<Guid, string>
            {
                { new Guid("{4d36e967-e325-11ce-bfc1-08002be10318}"),
                    "Disk Drives" },
                { new Guid("{4d36e968-e325-11ce-bfc1-08002be10318}"),
                    "Display Adapters" },
                { new Guid("{4d36e96b-e325-11ce-bfc1-08002be10318}"),
                    "Keyboards" },
                { new Guid("{4d36e96f-e325-11ce-bfc1-08002be10318}"),
                    "Mice" },
            };

        public enum DevRegProperty : uint
        {
            DeviceDescription = 1,
            HardwareId = 2,
            CompatibleIds = 3,
            Unused0 = 4,
            Service = 5,
            Unused1 = 6,
            Unused2 = 7,
            Class = 8,
            ClassGuid = 9,
            Driver = 0x0a,
            ConfigFlags = 0x0b,
            Mfg = 0x0c,
            FriendlyName = 0x0d,
            LocationInfo = 0x0e,
            PhysicalDeviceObjectName = 0x0f,
            Capabilities = 0x10,
            UiNumber = 0x11,
            UpperFilters = 0x12,
            LowerFilters = 0x13,
            BusTypeGuid = 0x014,
            LegacyBusType = 0x15,
            BusNumber = 0x16,
            EnumeratorName = 0x17,
        }

        [DllImport("kernel32.dll")]
        public static extern uint GetLogicalDrives();

        [DllImport("kernel32.dll")]
        public static extern int GetDriveType(
            [MarshalAs(UnmanagedType.LPStr)] string rootPathName);

        [DllImport("cfgmgr32.dll")]
        public static extern int CM_Connect_Machine(
            [MarshalAs(UnmanagedType.LPStr)] string uncServerName,
            ref IntPtr machineHandle);

        [DllImport("cfgmgr32.dll")]
        public static extern int CM_Disconnect_Machine(
            IntPtr machineHandle);

        [DllImport("cfgmgr32.dll")]
        public static extern int CM_Locate_DevNode_Ex(
            ref IntPtr deviceHandle,
            int deviceId,
            uint flags,
            IntPtr machineHandle);

        [DllImport("cfgmgr32.dll")]
        public static extern int CM_Get_Child_Ex(
            ref IntPtr childDeviceHandle,
            IntPtr parentDeviceHandle,
            uint flags,
            IntPtr machineHandle);

        [DllImport("cfgmgr32.dll")]
        public static extern int CM_Get_Sibling_Ex(
            ref IntPtr siblingDeviceHandle,
            IntPtr deviceHandle,
            uint flags,
            IntPtr machineHandle);

        [DllImport("cfgmgr32.dll")]
        public static extern int
            CM_Get_DevNode_Registry_Property_Ex(
                IntPtr deviceHandle,
                int property,
                IntPtr regDataType,
                IntPtr outBuffer,
                ref uint size,
                int flags,
                IntPtr machineHandle);
    }
}

Now I just need to link this device with volume (drive letters) contained in it. Any idea will be appreciatted.