The original Dreamcast GD-ROMs were capable of holding about 1GB of data, but much of that space was often filled with "dummy data" to push game files to the outer edges of the disc for faster physical reading. When using digital files, this dummy data is redundant.
Compressed formats organize data in chunks that modern storage can navigate more efficiently than raw .bin or .gdi files. 2. Storage Efficiency without Quality Loss 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 original Dreamcast GD-ROMs were capable of holding
The "Highly Compressed" moniker can sometimes be scary, but in the Dreamcast world, it rarely means a loss in visual or audio fidelity. but in the Dreamcast world
Tools like chdman use lossless compression. This means that while the file size on your SD card might drop from 1.1GB to 600MB, every single bit of game data is identical to the original when it is decompressed on the fly during play.