Standard USB connection at around £30 allows you to use one of the burners in the device to create your master. Ideal if your PC does not have a burner to make masters.
Copy Connect USB connection at around £130 (in HDD) will allow you to connect the duplicator to a host PC and from there copy ISO files to the harddrive of the duplicator.
Once the duplicator is detached from the PC you can perform you can select the image on the hard drive and perform standard copy operation.
Via the USB connect it is also possible to move files, rnamce partitions and delete image files.
When used on a USB duplicator you can also transfer your pritn files from the PC to the duplicator via the USB connect.