Sega utilized a proprietary optical disc format called GD-ROM (Gigabyte Disc), developed by Yamaha.
The Dreamcast died young, but its spirit lives on in every perfectly emulated frame of Shenmue’s rain-soaked Dobuita street. Whether you play on original hardware, a PC, or a phone—do it with respect for the creators who made those 1’s and 0’s sing. sega dreamcast roms
GD-ROM vs. CD-R: Retail games were 1GB GD-ROMs. To make them fit on standard 700MB burnable CDs back in the day, hackers had to "shrink" them by downsampling audio or removing video. Common Formats: Sega utilized a proprietary optical disc format called