Are you setting up an or an external hard drive/NAS ?
: For heavy, disc-based console systems, modern MiSTer ROM packs ditch bulky .bin/.cue file dumps in favor of CHD (Compressed Hunks of Data) files. CHD compression shrinks file storage loads by 50% to 60% without losing a single bit of game data or causing audio performance lags. Mister Rom Packs
Setting up your library generally involves three main methods: Are you setting up an or an external hard drive/NAS