A CDI file is a DiscJuggler image that allows 1GB GD-ROM data to be compressed or "downsampled" to fit onto standard 700MB CD-Rs.
However, even GDEMU users maintain CDI collections because many Homebrew games (like Intrepid Izzy or Xenocider ) are only distributed as CDI files. Dreamcast Cdi Collection
For collectors looking to build a Dreamcast CDI Collection, here are some tips: A CDI file is a DiscJuggler image that
In the early 2000s, playing backups was a hassle. You needed a "Boot Disc" like Utopia or DC-IE : swap in the boot disc, let it spin up, remove it, and swap in the game CD-R. You needed a "Boot Disc" like Utopia or
Dreamcast .cdi Collection: Technical Overview & Guide A Dreamcast .cdi collection consists of disc image files specifically formatted to bypass the console's standard GD-ROM copy protection, allowing games to run on standard CD-R media. Unlike official GD-ROMs, which hold approximately 1GB of data, .cdi files are modified to fit within the 700MB–800MB capacity of a standard CD. Core File Formats