[analyze]

System.Management.ManagementObjectSearcher mg = new System.Management.ManagementObjectSearcher("select * from win32_diskdrive"); // add refrence from : C:\Windows\Microsoft.NET\Framework\v2.0.50727\System.Management.dll
foreach (ManagementObject mgobj in mg.Get())
{
tmp1 = mgobj.GetPropertyValue("SerialNumber").ToString();
}
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