The standard Dreamcast GD-ROM held about 1GB of data. However, many games only used a fraction of that space, filled with "dummy data" to push content to the outer edge of the disc for faster reading.
The CD-i version of Veronica had long load screens. The Dreamcast CHD version on an SSD loads so fast that the door-opening animations become irritating. Compression actually Sega originally built in. dreamcast+games+highly+compressed+better
With a 256GB or 512GB SD card, using highly compressed CHD files allows you to fit the entire North American library on a single card, making your Dreamcast a true all-in-one powerhouse. 3. Better Compatibility with Modern ODEs The standard Dreamcast GD-ROM held about 1GB of data