static extern IntPtr FindFirstVolume([Out] StringBuilder lpszVolumeName,

  Declare Function FindFirstVolumeW Lib "kernel32.dll" (ByVal lpszVolumeName As System.Text.StringBuilder, ByVal cchBufferLength As UInteger) As IntPtr

    static extern FindVolumeSafeHandle FindFirstVolume([Out] StringBuilder lpszVolumeName, uint cchBufferLength);

        using (FindVolumeSafeHandle volumeHandle = FindFirstVolume(volume, bufferLength))

FindFirstVolume