| Compression Method | Compatibility | Load Time Impact | Preservation Quality | |-------------------|---------------|------------------|----------------------| | Dummy removal only | High | Minimal (faster) | Lossless | | Audio downsampling | Medium | Slight reduction | Lossy | | CDI with overburn | Variable | Slower (error correction) | Lossy | | CHD conversion | High (via Flycast, RetroArch) | Same as GDI | Lossless |
Some games compress better than others. If you are testing this format, start with these:
Games that compress poorly (staying large) are those with unique, high-entropy video files, like D2 or Skies of Arcadia.
1. Burning to CD-Rs Many purists play Dreamcast games on real hardware. Since standard CD burners cannot write GD-ROMs, gamers must fit the games onto standard 700 MB or 99-minute CD-Rs. Compression is the only way to fit massive titles like Shenmue or Skies of Arcadia onto a standard disc.
2. Storage and Emulation For those using the incredible Flycast or Redream emulators on PCs, phones, or the Raspberry Pi, compressed formats are a lifesaver.
