Sansumg HD 500 GB - USB - Machine Id Diferent

[acgubamg]

When a MachineID is created according to the command below:

Result: = Abs (CreateMachineID ([midUser, midSystem, midDrives], False));

If the user connects an external HD, this function starts to fail, due to the "midDrivers" type understanding HD as a parameter to generate the machineid, therefore, the external HD connected to the USB, is a removable driver.
How could you solve this problem, without having to remove midDrives from the option to generate the machineID?