GD-ROM

The GD-ROM (gigabyte disc read-only memory) is a proprietary optical disc format developed as a collaboration between Sega and Yamaha for the Dreamcast and other Sega systems.

== Specification == A double-density format based on the CD-ROM that could hold up to , it consists of a single-density track near the disc's center surrounded by a double-density track comprising much of the disc's capacity. The GD-ROM was created in response to developers exceeding the typical storage capacity of the CD-ROM; while DVD-ROM would have addressed this limitation, implementing its then-new technology would have made console production cost prohibitive. Along with the format's general novelty, the extra capacity also had the theoretical benefit of curbing video game piracy, a major concern of CD-based consoles that was validated by its rampancy on the PlayStation.