The DVD era has not been kind to Steven Chack.

Chack’s Naked Eye News and Video on San Francisco’s Haight Street, tucked in a basement retail space next to a medical marijuana shop, is a film buff’s paradise. He amiably rents the latest Tom Cruise and Star Wars films, but his eyes light up when a customer mentions an obscure Italian horror title or a Japanese samurai director.

Sharp has developed a two-layer optical disc which could boost the capacity of the next-generation Blu-ray format.