USB pen drive unique serial generator

This code id very useful to create a kind of USB protection (using a normal USB pen drive).
Each Pen Driver generate a different unique ID.
An example usage can be:
-1st store oh HD the pen drive seriale
-2nd compare the inserted pen drive serial with the one stored on HD .. when the serials are the same then 'do something'

Code:

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Func _GetDeviceID($drive,$fullid=0)
    $objWMIService = ObjGet("winmgmts:{impersonationLevel=Impersonate}!\\.\root\cimv2")
    If Not IsObj($objWMIService) Then Return -1 ;Failed to Connect to WMI on Local Machine

    $colDevice = $objWMIService.ExecQuery("SELECT * from Win32_LogicalDiskToPartition")
    $var=""
    For $objItem in $colDevice
        If StringInStr($objItem.Dependent,$drive) Then
            $var=StringTrimLeft($objItem.Antecedent,stringInstr($objItem.Antecedent,"="))
        EndIf
    Next
    If Not $var Then Return -2 ;Failed to Find Drive Letter

    $colDevice = $objWMIService.ExecQuery("SELECT * from Win32_DiskDriveToDiskPartition")
    $diskpartition = $var
    $var=""
    For $objItem in $colDevice
        If StringInStr($objItem.Dependent,$diskpartition) Then
            $var=StringTrimLeft($objItem.Antecedent,stringInstr($objItem.Antecedent,"="))
        EndIf
    Next
    If Not $var Then Return -3 ;Failed to Find Physical Drive #

    $colDevice = $objWMIService.ExecQuery("SELECT * from Win32_DiskDrive")
    $physicaldrive = StringReplace(StringReplace($var,"\\","\"),'"',"")
    $var=""
    For $objItem in $colDevice
        If $objItem.DeviceID = $physicaldrive Then
            $var=$objItem.PNPDeviceID
        EndIf
    Next
    If Not $var Then Return -4 ;Failed to Find DeviceID

    If Not $fullid Then $var = StringTrimLeft($var,StringInstr($var,"\",0,-1)) ;Return Full DeviceID (Full is very dirty)
    Return $var
EndFunc

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Ex. Usage:

Code:

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$idCurrent = _GetDeviceID($drive)

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