The hyperdrive inhibitor was a device critical in hyperdrive instrumentation: it prevented head-long trips into raging stars.
When astrogation computers registered a sun, the hyperdrive inhibitor module prevented the ship from getting out of hyperspace near the star, it did so by making the nav computer program boot. It was possible, but dangerous, to disengage the inhibitor.
It was in use since the Old Republic, at least, and most starships carried hyperdrive inhibitors. Failure of the device would be fatal if the ship jumped to a location too close to a star.
The planet Sedri registered as a huge sun to the navigation computers installed on starships due to the entity called Golden Sun. That way the planet remained hidden from galactic society for centuries, until an Imperial Scout vessel found it by accident after its hyperdrive inhibitor burned out. In order to travel to Sedri, crews had to disable the hyperdrive inhibitor aboard their ships. Even so, ships sent to Sedri were still lost.
The Galactic Empire tried to control the Golden Sun, that would have allowed them to hide Imperial fleets and planet as hyperdrive inhibitors would detect them as stars. However the Golden Sun vanished and regular travel to Sedri became possible.
- Galaxy Guide 4: Alien Races
- Galaxy Guide 8: Scouts
- Galaxy Guide 9: Fragments from the Rim
- Twin Stars of Kira
- Galaxy Guide 4: Alien Races, Second Edition
- Star Wars Gamemaster Screen, Revised