CHDMAN

Convert your CD roms into a lossless compressed format.

Preferred format

CHD is the preferred format for SEGA CD, PS1, and PC Engine games. Sometimes you can get up to 50% smaller files!

CHD is a lossless compression format originally developed for MAME, for the hard-drive contents of certain arcade machines. It has since been used in several other emulators as a means of storing CD-ROM game data.
- RetroPie

Usage

1. Extract folder_zipchdman 0.251 anywhere

2. Put your CUE/BIN images in the chdman folder

3. Click on cue2chd and wait for it to finish

4. Copy the resulting .chd files to the rom folder

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Find additional guides for Mac and Linux here.