Mini CDs, or pocket CDs, are CDs with a smaller diameter and one-third the storage capacity of a standard 120 mm disc.
Amongst the various formats are the
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.
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. Now, they are known as either Mini CDs or 80 mm CDs.
Most tray-loading CD devices have 2 'circular indentation'; one sized for a regular 120 mm CD, and a smaller, deeper circular indentation for Mini CDs to fit into, except for some Blu-ray players.
Devices that feature a spindle also support Mini CDs, 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, Nintendo Wii and the car CD players in many Honda vehicles are exceptions), but adapters are available into which one can snap an 80 mm round Mini CD in order to extend the width to match that of a 120 mm CD, and thus work in many slot-loading devices.
Most CD players in the late 1980s and early 1990s didn't handle the Mini CD circular indentation 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 80 mm circular indentation as standard.
Since the mid-1990s, all tray loading players have a circular indentation for the Mini CD.
Mini CD-R, Mini CD-RW: As of 2020, many manufacturers offer 80 mm CD-R and CD-RW discs for sale in retail electronics and office supply stores. 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:
The short lived "Lid Rock" promotion that gave away CD singles on the underside of soda lids from Regal Movie Theaters used Mini CDs.
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.
In 2002, Compaq offered a compact, lightweight Mini CD player that made up for the capacity difference between 120 mm and 80 mm 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 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 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 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 the various portable media storage devices such as the iPod Photo adapters and various other hard disk based photo storage units.