Mini CD
From Wikipedia, the free encyclopedia
- Not to be confused with MiniDisc.
Mini CDs, or "Pocket" CDs are compact discs with a smaller form factor and half the capacity.
Contents |
[edit] Formats
Amongst the various formats are the
- 3-inch CD single, an 80 mm 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 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 195MB (21 mins), which has the same data density as a 650 MB full-sized CD, and 210MB (24 mins), with the same data density as a 700MB full sized CD, used for "Pocket" data storage. (see also miniDVD)
- An enhanced density version of the 80 mm disc that holds 34 minutes, or 300 MB has been created [1] but is not readily available.
- Business card CD, a truncated 80 mm disc with a storage capacity from 30MB to 100MB
- The long axis is 80 mm while the short axis (from flat side to flat side) is generally between 58 and 68 mm
- 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.
[edit] Compatibility
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.
Devices that feature a spindle have no problem with 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.
Many slot-loading CD drives are generally incompatible, (the iMac of 1999 is an exception), 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. There are no adapters for business-card sized CDs[citation needed].
The Nintendo GameCube uses 80 mm discs for all software. The slot-loading Wii accepts GameCube discs.
A popular adapter model, Memorex 30183001, was discontinued in 2006.
Most CD players in the late 1980's and early 1990's didn't have 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 1990's, all tray loading players have wells for the CD3.
[edit] Retail availability
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 185MB (21 minutes) or 210MB (24 minutes) of data. The mini discs, despite having less weight and plastic, are generally more expensive than full size discs.
A variant of the Mini CD is the "business card cd", which cuts the top and bottom off a regular CD to approximate the size of a business card.. This media typically holds 50MB (6 minutes) of data or less.
While not technically "mini" CD media, some CD manufacturing plants offer die-cut CD media in a variety of shapes generally within the outline of the uncut mini CD. The shape usually cuts into the recording time.
The short lived "Lid Rock" promotion that gave away CD singles on the underside of soda lids from Regal Movie Theaters used Mini CDs.
[edit] 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.
[edit] Sony D-88
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.
[edit] Memorex 8081 Mini CD MP3 Player
Later, Memorex offered a portable CD player that matched the formfactor 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.
[edit] Sony Mavica
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. Interestingly, the media size for these devices was quoted at 156MB, rather than 185MB. 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 megabytes is used, the camera will appear to work, but data loss will likely occur.
[edit] Imation RipGo
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 (210MB) mini CD media; the device was shipped with 21 minute (185MB) media and seemed unreliable when burning on the slightly higher density media.
[edit] 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.
