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wiki-rtd/docs/wiki_faq/faq-other.md

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+## What are CD Image Formats and Disc Images?
+
+Disc images are exact copies of physical discs. They allow you to play games without using the original discs, which helps preserve them. 
+
+Some common File Formats for Disc Images are:
+
+### .iso (Optical Disc Image)
+
+- The most common disc image format.
+- Used for uncompressed disc images.
+
+### .nrg (Nero CD/DVD Image File)
+
+- Created with Nero disc authoring software.
+- Used for CD or DVD disc images.
+
+### .bin and .cue (Binary file and Cue sheet)
+
+- .bin file contains the data or audio track.
+- .cue file contains the structure details of the disc.
+- Always load the .cue file, not the .bin file.
+
+### .mdf and .mds (Media disk Image File and Media Descriptor File)
+
+- .mdf file contains the CD or DVD data.
+- .mds file contains the header and track information.
+
+### .chd (Compressed Hunks of Data)
+
+- A lossless compression format originally developed for MAME.
+- Compresses the contents of a disc image into a single .chd file.
+- Supported by many systems and recommended for 3DO, Dreamcast, Sega CD, Neo Geo CD, PC Engine CD, PSX, PS2, and Saturn.