Visual Basic - EJEMPLO NUMERO SERIE DISCO

En un formulario poner:
Private Declare Function GetVolumeInformation& Lib "kernel32" Alias "GetVolumeInformationA"
(ByVal lpRootPathName As String, ByVal pVolumeNameBuffer As String, ByVal nVolumeNameSize
As Long, lpVolumeSerialNumber As Long, lpMaximumComponentLength As Long, lpFileSystemFlags
As Long, ByVal lpFileSystemNameBuffer As String, ByVal nFileSystemNameSize As Long)

Private Sub Form_Load()
Dim cad1 As String * 256
Dim cad2 As String * 256
Dim numSerie As Long
Dim longitud As Long
Dim flag As Long
unidad = "C:\"
Call GetVolumeInformation(unidad, cad1, 256, numSerie, longitud, flag, cad2, 256)
MsgBox "Numero de Serie de la unidad " & unidad & " = " & numSerie
End Sub