Also known as pocket CD, 3" CD
CD with a smaller diameter and one third the storage capacity of a standard 120 mm disc

Definition of mini CD | PCMag
What does mini CD actually mean? Find out inside PCMag's comprehensive tech and computer-related encyclopedia.
pcmag.com →Using the same platter size as the mini CD, mini DVDs hold 1.4GB of video compared to 4.7GB for the regular 120mm DVD. See DVD . Before inserting a mini CD or mini DVD into the slot of a "feed drive," read the manual. Many feed drives do not accept the smaller platters and can be damaged. However, the small disc can be snapped into an 80-120mm adapter and then inserted. See business card CD and feed drive . Full and Mini The 80mm mini discs are considerably smaller than their 120mm full-size counterpart. How Drives Hold the Small Discs The top example shows a laptop optical drive onto which discs both large and small are snapped down onto the spindle (notice the springs). Desktop drives (arrow at bottom) have a well in the middle of the tray for the smaller size.
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).