This invention is a method allowing for interfacing high speed hard disk drives in high throughput PIO modes to currently available digital media processors. In this arrangement, the sequence processing program can be easily written without considering an internal state transition processing, and the internal state transition processing and the sequence processing program can be freely designed without the need of modifying the sequence processing program due to change of the internal state transition processing. The hybrid welding device may be adapted to provide power for a welding operation andor an auxiliary operation when operated as a standalone unit andor when connected to a primary source of utility power. In the unlatched position, the second body portion forms a lever arm for inserting or removing the module unit relative to the base unit. Computer controlled DME braking systems are disclosed as well as break-away and retractable antenna systems.