public List<Device> Devices{get{if (_devices == null){_devices = new List<Device>();int index = 0;while (true){Native.SP_DEVICE_INTERFACE_DATA interfaceData = new Native.SP_DEVICE_INTERFACE_DATA();interfaceData.cbSize = (UInt32)Marshal.SizeOf(interfaceData);if (!Native.SetupDiEnumDeviceInterfaces(_deviceInfoSet, IntPtr.Zero, ref _classGuid, (UInt32)index, ref interfaceData)){int error = Marshal.GetLastWin32Error();if (error != Native.ERROR_NO_MORE_ITEMS)throw new Win32Exception(error);break;}Native.SP_DEVINFO_DATA devData = new Native.SP_DEVINFO_DATA();IntPtr p = Marshal.AllocHGlobal(Marshal.SizeOf(devData));Marshal.StructureToPtr(devData, p, true);UInt32 size = 0;if (!Native.SetupDiGetDeviceInterfaceDetail(_deviceInfoSet, ref interfaceData, IntPtr.Zero, 0, ref size, p)){int error = Marshal.GetLastWin32Error();if (error != Native.ERROR_INSUFFICIENT_BUFFER)throw new Win32Exception(error);}Native.SP_DEVICE_INTERFACE_DETAIL_DATA detailDataBuffer = new Native.SP_DEVICE_INTERFACE_DETAIL_DATA();if (IntPtr.Size == 8) // for 64 bit operating systems{detailDataBuffer.cbSize = 8;}else{detailDataBuffer.cbSize = 4 + Marshal.SystemDefaultCharSize; // for 32 bit systems}IntPtr pBuf = Marshal.AllocHGlobal(Marshal.SizeOf(detailDataBuffer));Marshal.StructureToPtr(detailDataBuffer, pBuf, true);if (!Native.SetupDiGetDeviceInterfaceDetail(_deviceInfoSet, ref interfaceData, pBuf, size, ref size, p)){int error = Marshal.GetLastWin32Error();if (error != Native.ERROR_INSUFFICIENT_BUFFER)throw new Win32Exception(error);}devData = (Native.SP_DEVINFO_DATA)Marshal.PtrToStructure(p, typeof(Native.SP_DEVINFO_DATA));Marshal.FreeHGlobal(p);detailDataBuffer = (Native.SP_DEVICE_INTERFACE_DETAIL_DATA)Marshal.PtrToStructure(pBuf, typeof(Native.SP_DEVICE_INTERFACE_DETAIL_DATA));Marshal.FreeHGlobal(pBuf);string devicePath = detailDataBuffer.DevicePath;Native.STORAGE_DEVICE_NUMBER storageDeviceNumber = GetDeviceNumber(devicePath);Device device = CreateDevice(this, devData, devicePath, storageDeviceNumber.DeviceNumber);_devices.Add(device);index++;}_devices.Sort();}return _devices;}}

internal Native.STORAGE_DEVICE_NUMBER GetDeviceNumber(string devicePath){IntPtr hFile = Native.CreateFile(devicePath.TrimEnd('\\'), 0, 0, IntPtr.Zero, Native.OPEN_EXISTING, 0, IntPtr.Zero);if (hFile.ToInt32() == Native.INVALID_HANDLE_VALUE)throw new Win32Exception(Marshal.GetLastWin32Error());int bytesReturned;Native.STORAGE_DEVICE_NUMBER storageDeviceNumber = new Native.STORAGE_DEVICE_NUMBER();int size = Marshal.SizeOf(storageDeviceNumber);IntPtr buffer = Marshal.AllocHGlobal(size);try{if (!Native.DeviceIoControl(hFile, Native.IOCTL_STORAGE_GET_DEVICE_NUMBER, IntPtr.Zero, 0, buffer, size, out bytesReturned, IntPtr.Zero)){// do nothing here on purpose}}finally{Native.CloseHandle(hFile);}if (bytesReturned > 0){storageDeviceNumber = (Native.STORAGE_DEVICE_NUMBER)Marshal.PtrToStructure(buffer, typeof(Native.STORAGE_DEVICE_NUMBER));}Marshal.FreeHGlobal(buffer);return storageDeviceNumber;}

        [StructLayout(LayoutKind.Sequential)]internal struct STORAGE_DEVICE_NUMBER{public int DeviceType;public int DeviceNumber;public int PartitionNumber;}internal const int IOCTL_STORAGE_GET_DEVICE_NUMBER = 0x2D1080;

IntPtr hFile = Native.CreateFile(@"\\.\" + LogicalDrive, Native.GENERIC_READ, Native.FILE_SHARE_READ | Native.FILE_SHARE_WRITE, IntPtr.Zero, Native.OPEN_EXISTING, 0, IntPtr.Zero);

IntPtr hFile = Native.CreateFile(@"\\.\" + LogicalDrive, 0, Native.FILE_SHARE_READ | Native.FILE_SHARE_WRITE, IntPtr.Zero, Native.OPEN_EXISTING, 0, IntPtr.Zero);

     [StructLayout(LayoutKind.Sequential)]internal class SP_DEVINFO_DATA{internal int cbSize = Marshal.SizeOf(typeof(SP_DEVINFO_DATA));internal Guid classGuid = Guid.Empty; // tempinternal int devInst = 0; // dumyinternal int reserved = 0;}[StructLayout(LayoutKind.Sequential, Pack = 2)]internal struct SP_DEVICE_INTERFACE_DETAIL_DATA{internal int cbSize;internal short devicePath;}[StructLayout(LayoutKind.Sequential)]internal class SP_DEVICE_INTERFACE_DATA{internal int cbSize = Marshal.SizeOf(typeof(SP_DEVICE_INTERFACE_DATA));internal Guid interfaceClassGuid = Guid.Empty; // tempinternal int flags = 0;internal int reserved = 0;}

[StructLayout(LayoutKind.Sequential)]internal class SP_DEVINFO_DATA{internal int cbSize = Marshal.SizeOf(typeof(SP_DEVINFO_DATA));internal Guid classGuid = Guid.Empty; // tempinternal int devInst = 0; // dumyinternal IntPtr reserved = IntPtr.Zero;}[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]internal struct SP_DEVICE_INTERFACE_DETAIL_DATA{internal Int32 cbSize;[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 256)]internal string DevicePath;}[StructLayout(LayoutKind.Sequential)]internal struct SP_DEVICE_INTERFACE_DATA{internal UInt32 cbSize;internal Guid interfaceClassGuid;internal UInt32 flags;internal UIntPtr reserved;}

                                IntPtr extentPtr = new IntPtr(buffer.ToInt32() + Marshal.SizeOf(typeof(long)) + i * Marshal.SizeOf(typeof(Native.DISK_EXTENT)));

                                IntPtr extentPtr = new IntPtr(buffer.ToInt64() + Marshal.SizeOf(typeof(long)) + i * Marshal.SizeOf(typeof(Native.DISK_EXTENT)));