The U.S. Department of Justice has demanded for details from Sony about its optical disc drive production in what might be the start of an examination into the business.

Sony Optiarc America got the call from the DOJ, Sony alleged in a filing to the Tokyo Stock Exchange on Monday morning.

Sony also alleged it understands the appeal is part of a wider evaluation of rivalry in the disc drive market by the DOJ as well as competition authorities in additional countries.

Sony Optiarc is a foremost producer of optical disc drives for Blu-ray Disc as well as DVD. Its drives are used in products made by Sony as well as additional electronics as well as PC manufacturer. It has two subsidiaries: a U.S. unit in San Jose as well as a European unit in Ismaning, Germany. The corporation was before an undertaking among Sony as well as NEC though NEC sold its 45 percent stake in the corporation to Sony last year.