Bạn thử đoạn Code này nhé
Function HDSerialNumber() As String
Dim fsObj As Object
Dim drv As Object
Set fsObj = CreateObject("Scripting.FileSystemObject")
Set drv = fsObj.Drives("C")
HDSerialNumber = Left(Hex(drv.SerialNumber), 4) _
& "-" & Right(Hex(drv.SerialNumber), 4)
End Function