- Not to be confused with MiniDisc.
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Amongst the various formats are the
- Mini CD single, a small disc. The format is mainly used for audio CD singles in certain regions (singles are sold on normal 120 mm CDs in many countries), much like the old vinyl single. An 80 mm disc can hold up to 24 minutes of music, or 210 MB (210 × 220 bytes) of data. They are often referred to as Maxi CDs in some countries.
- The low density version holds 18 minutes, or 155 MB.
- Other formats are 185 MB (21 mins), which has the same data density as a 650 MB full-sized CD, and 210 MB (24 mins), with the same data density as a 700 MB full sized CD, used for "Pocket" data storage. (see also miniDVD)
- Business card CD (or "b-card"), a truncated (to the shape and size of a business card) disc with a storage capacity from 30 MB to 100 MB.
- The long axis is 80 mm while the short axis (from flat side to flat side) is generally between 58 and 68 mm
In 1997 Dean Procter of Imaginet was offering business card sized square CDs with full screen hi-fi stereo video which played in quad speed CD ROMs or DVD drives with the centre well. A variety of laser cut shapes were developed. 
- The disc may be rectangular with wings added on, to square off the rounded 80 mm disc.
- 60 mm disc, a round version of the business card, with comparable capacity (50 MB)
When Mini CDs were first introduced in the United States, they were initially marketed as CD3, in reference to their approximate size in inches; larger CDs were called CD5, despite the fact that both CD specifications are defined solely in terms of metric units.
Most tray-loading CD devices have 2 'wells'; one sized for a regular 120 mm CD, and a smaller, deeper well for MiniCDs to fit into, except for some Blu-ray players.
Devices that feature a spindle also support MiniCDs, as the disc can simply be placed onto the spindle as with a normal CD.
Some vertically aligned tray-loading devices, such as the older pre-slimline PlayStation 2 consoles when placed vertically, require an adapter for use with 80 mm CDs.
Most slot-loading CD drives are generally incompatible (the PlayStation 3 and Wii are exceptions), but adapters are available into which one can snap an 80 mm round miniCD in order to extend the width to match that of a 120 mm CD, and thus work in many slot-loading devices.
A popular adapter model, Memorex 30183001, was discontinued in 2006.
Most CD players in the late 1980s and early 1990s didn't handle the CD3 well and required the use of an adapter, or very careful placement of the CD in the exact middle of the tray. Not until after the major record labels discontinued them, did the CD Players start to have the CD3 wells as standard.
Since the mid-1990s, all tray loading players have wells for the CD3.
Mini CD-R, Mini CD-RW: As of 2007, many manufacturers offer 80 mm CD-R and CD-RW discs for sale in retail electronics and office supply stores. These are sometimes marketed as "Pocket CD-R/CD-RW" (Memorex) or "Mini CD-R" (TDK). Most of the blank discs available in retail hold either 185 MB (21 minutes) or 210 MB (24 minutes) of data. The mini discs, despite having less weight and plastic, are generally more expensive than full size CD-R/CD-RW discs.
Mini CD Replication Manufacturing: Custom-manufactured Mini CDs with integral data are available to the retail market. There are two variations on how the finished product is created:
- Replicated to its finished size and shape: Through a single-step replication process  the Mini CD is injection-molded to its finished size and shape and imprinted with data in exactly the same manner as full-size Audio CD or CDROM discs.
- Replicated and machine-cut to its finished size and shape: Some CD replication companies make Mini CDs by taking full-size Audio CD or CDROM discs and machine-cutting them down to their finished size and shape.
The short lived "Lid Rock" promotion that gave away CD singles on the underside of soda lids from Regal Movie Theaters used Mini CDs.
Devices that use MiniCD
While almost any spindle-based or tray-based CD device can utilize mini CD media, some devices have been designed expressly to use the smaller format, usually for portability reasons.
The first shirt-pocket CD player was the Sony D-88 (ca. 1990). It only played standard PCM audio (Red Book) CDs. It could play 120 mm discs if a guard was moved to allow the disc to protrude from the unit.
Compaq iPaq PM-1 Mini CD MP3 Player
In 2002, Compaq offered a compact, lightweight Mini CD player that made up for the capacity difference between 12 cm and 8 cm audio CDs by using MP3 compression, resulting in 1.1x to 3.5x the capacity of a standard audio CD, depending on compression ratio.
Memorex 8081 Mini CD MP3 Player
Memorex offered a portable CD player that matched the form factor for the 80 mm CD (Model MPD8081). The player was marketed as an MP3 device, and the user was encouraged to burn MP3 music files to a mini CD, and then play them in the player, which was noticeably smaller than a standard portable CD player. The player could also play Red Book audio content burned onto mini CDs. It can play both CD-R and CD-RW media, as well as pressed mini CDs.
Sony's Mavica line of digital cameras also offered some cameras that record directly to mini CD media. There were two models, the CD350 and the CD500, which offered 3.2 megapixels and 5.0 megapixels, respectively. These cameras could also record MPEG video directly to the Mini CD - a sort of precursor to mini DVD camcorders. The media size for these devices was quoted at 156 MB, rather than 185 MB. It is possible that these devices used a packet writing format which took away some available disk space for use by formatting information. A common problem for Mavica owners has been incorrect disc size. If a disc size other than 156 MB is used, the camera will appear to work, but data loss will likely occur.
The Imation RipGo! was a portable CD-R burner that was a similar form factor to that of the Memorex Mini CD player. Again, it was marketed as an MP3 device, and it could play MP3 and WMA files burned onto Mini CD media. It was powered by an internal lithium ion battery that could power the unit for five hours of playback. The device suffered some setbacks, most notably a slow CD initialize time (the time during which the drive analyzes the contents of an MP3 CD), maximum of 4X burning speed (due to the device using USB 1.1 to connect to its host computer), and no support for CD-RW media. Some people have also reported issues using the device with 24 minute (210 MB) mini CD media; the device was shipped with 21 minute (185 MB) media and seemed unreliable when burning on the slightly higher density media.
Sony PlayStation Portable
Sony Photo Vault
Sony also manufactured a mini CD burning device, designed to be "PC-free." The device allowed the user to directly burn images from a Memory Stick or a USB flash drive or camera to a mini CD. It was a precursor to modern "media vaults" such as the iPod Photo adapters and various other hard disk based photo storage units.
- Bootable business card
- Compact Disc
- Mini CD single
- DataPlay, a proprietary write-once mini optical disc format which is even smaller than mini CD media
- DVD card, the equivalent to the business card CD
- MiniDisc, the popular proprietary Sony mini optical media
- MiniDVD, the 80 mm DVD format, for video-singles
- Shaped CD