Se for realmente o Serial Number o que você quer pegar basta adicionar a referência e importar o namespace
Imports System.Management
e usar:
Dim HDD_Serial As String
Dim hdd As New ManagementObjectSearcher("select * from Win32_DiskDrive")
For Each hd In hdd.Get
HDD_Serial = hd("SerialNumber")
Next
Bruno Ferreira de Souza
MVP - Microsoft Valuable Professional
MCTS .NET Framework - Windows Applications
MCPD .NET Framework - Windows Applications
www.maestrodotnet.com.br
@BrunoMaestro