This error occurs when we cannot determine which drive letter is associated with the Dinkey FD dongle attached to your machine.

You can get this error if you are running under a virtual OS. In this case the client OS often does not preserve the USB device hierarchy, so we cannot detect which flash disk belongs to which dongle.

If you use the API Method and you do not need to know the flash disk drive letter / mount path then you can set the DONT_RETURN_FD_DRIVE flag, so that our code does not try to find out the flash drive and hence does not give error 578.

If you use the Shell Method of protection then this is done automatically for you since version 7.3.0.1.

Alternatively, it may be that the flash disk part of the dongle is not detected and a drive letter has not been assigned by the OS. You can check that by looking using a file explorer. In this case there may be a problem with the dongle - please contact Microcosm.