The ID10 seeker droid represented an advancement over the ID9, belonging to the seeker droid line, and notably featured four legs in contrast to the five legs of its predecessor. Following the Battle of Yavin in 0 BBY and the subsequent establishment of Inferno Squad, Dio was one such ID10 unit put into service.
After Del Meeko and Iden Versio chose to defect and join the New Republic, he undertook the task of repairing and repainting Dio. Sometime after this, Dio came to safeguard the blueprints for the First Order Dreadnought which were ultimately intended for the Resistance.