Not possible to use dldiag 5.2 with WDC WD15EADS-00P8B0

Is there any reason why it is not possible to test my WD15EADS-00P8B0 with dldiag 5.20?

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For a list of errors for Data Lifeguard Diagnostics see the link bellow:

http://support.wdc.com/techinfo/general/errorcodes.asp?lang=en#v10

For additional information you can contact technical support.