Sony announced the MiniDisc in September 1992 and released it in November[2] of that year for sale in Japan and in December in Europe, North America, and other countries.[3] The music format was based on ATRACaudio data compression, Sony's own proprietary compression code. Its successor, Hi-MD, would later introduce the option of linear PCMdigital recording to meet audio quality comparable to that of a compact disc. MiniDiscs were very popular in Japan and found moderate success in Europe.[4] Although it was designed to succeed the cassette tape, it did not manage to supplant it globally.[5]
By March 2011 Sony had sold 22 million MD players, but halted further development.[6] Sony ceased manufacturing and sold the last of the players by March 2013.[7]
Sony's MiniDisc was one of two rival digital systems introduced in 1992 that were intended to replace the PhilipsCompact Cassette analog audio tape system: the other was the Digital Compact Cassette (DCC), created by Philips and Matsushita (now Panasonic). Sony had originally intended the Digital Audio Tape (DAT) to be the dominant home digital audio recording format, replacing the analog cassette. Because of technical delays, the DAT was not launched until 1989, and by then the U.S. dollar had fallen so far against the yen that the introductory DAT machine Sony had intended to market for about $400 in the late 1980s then had to retail for $800 or even $1,000 to break even, putting it out of reach of most users.
Relegating DAT to professional use, Sony set to work to come up with a simpler, more economical digital home format. By the time Sony came up with the MiniDisc in late 1992, Philips had introduced a competing system, DCC, on a magnetic tape cassette. This created marketing confusion very similar to the videocassette format war of the late 1970s and early 1980s. Sony licensed MD technology to other manufacturers, with JVC, Sharp, Pioneer, Panasonic and others producing their own MD products. However, non-Sony machines were not widely available in North America, and companies such as Technics and Radio Shack tended to promote DCC instead.
Despite having a loyal customer base largely of musicians and audio enthusiasts,[citation needed] the MiniDisc met with only limited success in the United States. It was very popular in Japan and parts of Asia, and relatively so in Europe during the 1990s and into the 2000s, but did not enjoy comparable sales success in other markets. Since then, recordable CDs, flash memory and HDD and solid-state-based digital audio players such as iPods have become increasingly popular as playback devices.
The slow uptake of MiniDisc was attributed to the small number of pre-recorded albums available on MD, because relatively few record labels embraced the format. The initial high cost of equipment and blank media was also a factor. Additionally, home MiniDisc decks were less widely available, with most consumers instead connecting a portable MD device to their hi-fi system in order to record.
MiniDisc technology was faced with new competition from the recordable compact disc (CD-R) when it became more affordable to consumers beginning around 1996. Initially, Sony believed that it would take around a decade for CD-R prices to become affordable – the cost of a typical blank CD-R disc was around $12 in 1994 – but CD-R prices fell much more rapidly than envisioned, to the point where CD-R blanks sank below $1 per disc by the late 1990s, compared to at least $2 for the cheapest 80-minute MiniDisc blanks.
The biggest competition for MiniDisc came with the emergence of MP3 players. With the Diamond Rio player in 1998 and the Apple iPod in 2001, the mass market began to eschew physical media in favor of more convenient file-based systems.
Sony Hi-MD Recorder MZ-RH1, released 2006
By 2007, because of the waning popularity of the format and the increasing popularity of solid-state MP3 players, Sony was producing only one model, the Hi-MD MZ-RH1, available as the MZ-M200 in North America packaged with a Sony microphone and limited macOS software support.[9][10][11]
The MZ-RH1 allowed users to freely move uncompressed digital recordings back and forth from the MiniDisc to a computer without the copyright protection limitations previously imposed upon the NetMD series. This allowed the MiniDisc to better compete with HD recorders and MP3 players. However, most pro users like broadcasters and news reporters had already abandoned MiniDisc in favor of solid-state recorders, because of their extended recording time, open digital content sharing, high-quality digital recording capabilities and reliable, lightweight design.
On 7 July 2011, Sony announced that it would no longer ship MiniDisc Walkman products as of September 2011,[6] effectively killing the format.[12]
On 1 February 2013, Sony issued a press release on the Nikkei stock exchange that it would cease shipment of all MD devices, with last of the players to be sold in March 2013. However, it would continue to sell blank discs and offer repair services.[2] Other manufacturers continued to release MiniDisc players long after Sony stopped, with TEAC & TASCAM producing new decks up until 2020 when both its consumer and professional products, TEAC MD-70CD and TASCAM MD-CD1MKIII, were discontinued.[13]
The disc is fixed in a cartridge (68×72×5mm) with a sliding door, similar to the casing of a 3.5" floppy disk. This shutter is opened automatically when inserted into a drive. MiniDiscs can either be blank or prerecorded. Recordable MiniDiscs use a magneto-optical system to write data: a laser below the disc heats a spot to its Curie point, making the material in the disc susceptible to a magnetic field. A magnetic head above the disc then alters the polarity of the heated area, recording the digital data onto the disk. Playback is accomplished with the laser alone: taking advantage of the magneto-optic Kerr effect, the player senses the polarization of the reflected light as a 1 or a 0. Recordable MDs can be rerecorded repeatedly, with Sony claiming up to one million times. By May 2005, there were 60-minute, 74-minute and 80-minute discs available. 60-minute blanks, which were widely available in the early years of the format's introduction, were phased out.
MiniDiscs use a mastering process and optical playback system that is very similar to CDs. The recorded signal of the premastered pits and of the recordable MD are also very similar. Eight-to-Fourteen Modulation (EFM) and a modification of CD's CIRC code, called Advanced Cross Interleaved Reed-Solomon Code (ACIRC) are employed.
Differences from cassette and CDs
Comparison of several forms of disk storage showing tracks; green denotes start and red denotes end. Some CD-R(W) and DVD-R(W)/DVD+R(W) recorders operate in ZCLV, CAA or CAV modes.
MiniDiscs use rewritable magneto-optical storage to store data. Unlike DCC or the analog Compact Cassette, MiniDisc is a random-access medium, making seek time very fast. MiniDiscs can be edited very quickly even on portable machines. Tracks can be split, combined, moved or deleted with ease either on the player or uploaded to a PC with Sony's SonicStage V4.3 software and edited there. Transferring data from an MD unit to a non-Windows PC can only be done in real time, preferably via optical I/O, by connecting the audio out port of the MD to an available audio in port of the computer. With the release of the Hi-MD format, Sony began to use Mac OS X-compatible software. However, the Mac OS X-compatible software was still not compatible with legacy MD formats (SP, LP2, LP4). This means that an MD recorded on a legacy unit or in a legacy format still requires a Windows PC for faster than real-time transfers.
The beginning of the disc has a table of contents (TOC, the System File area), which stores the start positions of the various tracks, as well as metadata (title, artist) and free blocks. Unlike a conventional cassette, a recorded song does not need to be stored as one piece on the disc, it can be scattered in fragments, similar to a hard drive. Early MiniDisc equipment had a fragment granularity of 4 seconds of audio. Fragments smaller than the granularity are not monitored, which may lead to the usable capacity of a disc shrinking over time. No means of defragmenting the disc is provided in consumer-grade equipment.
All consumer-grade MiniDisc devices have a copy-protection scheme called the Serial Copy Management System. An unprotected disc or song can be copied without limit, but the copies can no longer be digitally copied. However, as a concession, the last Hi-MD players can upload to PC a digitally recorded file which can be resaved as a WAV (PCM) file and thus replicated.
Audio data compression
The digitally encoded audio signal on a MiniDisc has traditionally been data-compressed using the ATRAC (Adaptive Transform Acoustic Coding) format.
ATRAC was devised to allow MiniDisc to have the same runtime as a CD. ATRAC reduces the 1.4Mbit/s of a CD to a 292kbit/s data stream,[14] roughly a 5:1 reduction. ATRAC was also used on nearly all flash memory Walkman devices until the 8 series.
The ATRAC codec differs from uncompressed PCM in that it is a psychoacousticlossy audio data reduction scheme. Like other lossy audio compression formats, it is intended to be acoustically transparent, but some listeners claim to be able to hear audible artifacts.
There have been four versions of ATRAC, each claimed by Sony to more accurately reflect the original audio. Early players are guaranteed to play later version ATRAC audio. Version1 could only be copied on consumer equipment three or four times before artifacts became objectionable, as the ATRAC on the recorder attempted to compress the already compressed data. By version4, the potential number of generations of copy had increased to around 15 to 20 depending on audio content.
The latest versions of Sony's ATRAC are ATRAC3 and ATRAC3plus. Original ATRAC3 at 132kbit/s (also known as ATRAC-LP2 mode) was the format that was used by Sony's defunct Connect audio download store. ATRAC3plus was not used in order to retain backwards compatibility with earlier NetMD players.
In the MiniDisc's final iteration, Hi-MD, uncompressed CD-quality linear PCM audio recording and playback is offered, placing Hi-MD on par with CD-quality audio. Hi-MD also supports both ATRAC3 and ATRAC3plus at various bitrates, but not the original ATRAC (except for playback only).
Anti-skip
MiniDisc has a feature that prevents disc skipping under all but the most extreme conditions. Older CD players had been a source of annoyance to users as they were prone to mistracking from vibration and shock. MiniDisc solved this problem by reading the data into a memory buffer at a higher speed than was required before being read out to the digital-to-analog converter at the standard rate of the format. The size of the buffer varies by model.
If a MiniDisc player is bumped, playback continues unimpeded while the laser repositions itself to continue reading data from the disc. This feature allows the player to stop the spindle motor for significant periods, increasing battery life.
A buffer of at least six seconds is required on all MiniDisc players, whether portable or full-sized units. This ensures uninterrupted playback in the presence of file fragmentation.
Operation
MiniDisc Deck MDS-JE780 (2002–2005)MiniDisc Recorder MDS-B1, normally used in recording or broadcast radio studios.Detail view of the MZ-R30 MiniDisc recorder (Sony, 1996)
The data structure and operation of a MiniDisc is similar to that of a computer's hard disk drive. The bulk of the disc contains audio data, and a small section contains the table of contents (TOC), providing the playback device with vital information about the number and location of tracks on the disc. Tracks and discs can be named. Tracks may easily be added, erased, combined and divided, and their preferred order of playback modified. Erased tracks are not physically erased, but are only marked as deleted. When a disc becomes full, the recorder can simply direct the data into sections where erased tracks reside. This can lead to fragmentation but unless many erasures and replacements are performed, the only likely problem is excessive searching, reducing battery life.
The data structure of the MiniDisc, where music is recorded in a single stream of bytes while the TOC contains pointers to track positions, allows for gapless playback of music, something which competing portable players such as most MP3 players, fail to implement properly. Notable exceptions are CD players, as well as all recent iPods.
At the end of recording, after the "Stop" button has been pressed, the MiniDisc may continue to write music data for a few seconds from its memory buffers. During this time, it may display a message ("Data Save", on at least some models) and the case will not open. After the audio data is written out, the final step is to write the TOC track denoting the start and endpoints of the recorded data. Sony points out in the manual that the power should not be interrupted or the unit exposed to undue physical shock during this time.
Copy protection
All MiniDisc recorders use the SCMS copy protection system which uses two bits in the S/PDIF digital audio stream and on disc to differentiate between "protected" vs. "unprotected" audio, and between "original" vs. "copy":
Recording digitally from a source marked "protected" and "original" (produced by a prerecorded MD or an MD that recorded an analogue input) was allowed, but the recorder would change the "original" bit to the "copy" state on the disc to prevent further copying of the copy. A CD imported via a digital connection does not have the SCMS bits (as the CD format predates SCMS), but the recording MD recorder treats any signal where the SCMS bits are missing as protected and original. The MD copy, therefore, cannot be further copied digitally.
Recording digitally from a source marked "protected" and "copy" was not allowed: an error message would be shown on the display.
Recording digitally from a source marked "unprotected" was also allowed; the "original/copy" marker was ignored and left unchanged.
Recording from an analogue source resulted in a disc marked "protected" and "original" allowing one further copy to be made (this contrasts with the SCMS on the Digital Compact Cassette where analogue recording was marked as "unprotected").
In recorders that could be connected to a PC via USB, it was possible to transfer audio from the PC to the MiniDisc recorder, but for many years it was not possible to transfer audio in the other direction. This restriction existed in both the SonicStage software and in the MiniDisc player itself. SonicStage V3.4 was the first version of the software where this restriction was removed, but it still required a MiniDisc recorder/player that also had the restriction removed. The Hi-MD model MZ-RH1 was the only such player available.
MD Data, a format for storing computer data, was announced by Sony in 1993.[16] Its media were generally incompatible with standard audio MiniDiscs.[17] MD Data can not write to audio MDs, but only the considerably more expensive data blanks. It did see some success in a small number of multi-track recorders such as Sony's MDM-X4, Tascam's 564 (which could also record using standard audio MD discs, albeit only two tracks), and Yamaha's MD8, MD4, & MD4S.
MD Data2
In 1997, MD Data2 blanks were introduced with 650MB. They were only implemented in Sony's short-lived MD-based camcorder, the DCM-M1.
MDLP
In 2000, Sony announced MDLP (MiniDisc Long Play), which added new recording modes based on the new codec ATRAC3. In addition to the standard, high-quality mode, now called SP, MDLP adds LP2 mode, which doubles the recording time – 160 minutes on an 80-minute disc – of good-quality stereo sound, and LP4, which allows four times more recording time – 320 minutes on an 80-minute disc – of medium-quality stereo sound.
The bitrate of the standard SP mode is 292kbit/s, and it uses separate stereo coding with discrete left and right channels. LP2 mode uses a bitrate of 132kbit/s and also uses separate stereo coding. The third mode, LP4, has a bitrate of 66kbit/s and uses joint stereo coding. The sound quality is noticeably degraded compared to the other two modes, but is sufficient for many uses.
Tracks recorded in LP2 or LP4 mode play back as silence on non-MDLP players.
NetMD
A NetMD Sony MiniDisc Recorder
Debuting in late 2001, NetMD recorders allow music files to be transferred from a computer to a recorder (but not in the other direction) over a USB connection. In LP4 mode, speeds of up to 32× real-time are possible and three Sony NetMD recorders (MZ-N10, MZ-N910, and MZ-N920) are capable of speeds up to 64× real-time. NetMD recorders all support MDLP.
When transferring music in SP mode using NetMD with SonicStage, what is transferred is actually padded LP2. That is to say that the quality of the music is that of LP2 but recorded as SP.
NetMD is a proprietary protocol that initially required proprietary software such as SonicStage. A free *nix based implementation, libnetmd, has been developed. The library allows the user to upload SP files in full quality. In 2019, a programmer named Stefano Brilli compiled the linux-minidisc CLI into a web browser-based application,[18] allowing users to transfer music via USB on modern devices.[19]
Hi-MD is a further development of the MiniDisc format. Hi-MD media will not play on non-Hi-MD equipment, including NetMD players. The Hi-MD format, introduced in 2004, marked a return to the data storage arena with its 1GB discs and ability to act as a USB drive.[20] Hi-MD units allow the recording and playback of audio and data on the same disc, and can write both audio and data to standard MiniDisc media – an 80-minute MiniDisc blank could be formatted to store 305MB of data.
Recording and transfer modes
Modes marked in green are available for recordings made on the player, while those marked in red are available for music transferred from a PC. Capacities are official Sony figures; real world figures are usually slightly higher. Native MP3 support was added in second-generation Hi-MD players in the spring of 2005.[21]SonicStage version 3.4, released in Feb 2006,[22] introduced ripping CDs in bitrates 320 and 352[23] and added track transfer in ATRAC 192kbit/s to Hi-MD devices.
The compact disc (CD) is a digital optical disc data storage format that was co-developed by Philips and Sony to store and play digital audio recordings. It uses the Compact Disc Digital Audio format which typically provides 74 minutes of audio on a disc. In later years, the compact disc was adapted for non-audio computer data storage purposes as CD-ROM and its derivatives. First released in Japan in October 1982, the CD was the second optical disc technology to be invented, after the much larger LaserDisc (LD). By 2007, 200 billion CDs had been sold worldwide.
Compact Disc Digital Audio, also known as Digital Audio Compact Disc or simply as Audio CD, is the standard format for audio compact discs. The standard is defined in the Red Book technical specifications, which is why the format is also dubbed "Redbook audio" in some contexts. CDDA utilizes pulse-code modulation (PCM) and uses a 44,100 Hz sampling frequency and 16-bit resolution, and was originally specified to store up to 74 minutes of stereo audio per disc.
Video CD is a home video format and the first format for distributing films on standard 120 mm (4.7 in) optical discs. The format was widely adopted in Southeast Asia, South Asia, East Asia, Central Asia and West Asia, superseding the VHS and Betamax systems in the regions until DVD-Video finally became affordable in the first decade of the 21st century.
Adaptive Transform Acoustic Coding (ATRAC) is a family of proprietary audio compression algorithms developed by Sony. MiniDisc was the first commercial product to incorporate ATRAC, in 1992. ATRAC allowed a relatively small disc like MiniDisc to have the same running time as CD while storing audio information with minimal perceptible loss in quality. Improvements to the codec in the form of ATRAC3, ATRAC3plus, and ATRAC Advanced Lossless followed in 1999, 2002, and 2006 respectively.
The VHS is a standard for consumer-level analog video recording on tape cassettes, introduced in 1976 by the Victor Company of Japan (JVC). It was the dominant home video format throughout the tape media period in the late 1970s, 1980s, 1990s and early 2000s.
The Compact Cassette, also commonly called a cassette tape, audio cassette, or simply tape or cassette, is an analog magnetic tape recording format for audio recording and playback. Invented by Lou Ottens and his team at the Dutch company Philips, the Compact Cassette was released in August 1963.
Digital Audio Tape is a signal recording and playback medium developed by Sony and introduced in 1987. In appearance it is similar to a Compact Cassette, using 3.81 mm / 0.15" magnetic tape enclosed in a protective shell, but is roughly half the size at 73 mm × 54 mm × 10.5 mm. The recording is digital rather than analog. DAT can record at sampling rates equal to, as well as higher and lower than a CD at 16 bits quantization. If a comparable digital source is copied without returning to the analogue domain, then the DAT will produce an exact clone, unlike other digital media such as Digital Compact Cassette or non-Hi-MD MiniDisc, both of which use a lossy data-reduction system.
A cassette deck is a type of tape machine for playing and recording audio cassettes that does not have a built-in power amplifier or speakers, and serves primarily as a transport. It can be a part of an automotive entertainment system, a part of a portable audio system or a part of a home component system. In the latter case, it is also called a component cassette deck or just a component deck.
The Serial Copy Management System (SCMS) is a copy protection scheme that was created in response to the digital audio tape (DAT) invention, in order to prevent DAT recorders from making second-generation or serial copies. SCMS sets a "copy" bit in all copies, which prevents anyone from making further copies of those first copies. It does not, however, limit the number of first-generation copies made from a master.
Digital Compact Cassette (DCC) is a magnetic tape sound recording format introduced by Philips and Matsushita Electric in late 1992 and marketed as the successor to the standard analog Compact Cassette. It was also a direct competitor to Sony's MiniDisc (MD), but neither format toppled the then-ubiquitous analog cassette despite their technical superiority, and DCC was discontinued in October 1996. Another competing format, the Digital Audio Tape (DAT), had by 1992 also failed to sell in large quantities to consumers, although it was popular as a professional digital audio storage format.
A format war is a competition between similar but mutually incompatible technical standards that compete for the same market, such as for data storage devices and recording formats for electronic media. It is often characterized by political and financial influence on content publishers by the developers of the technologies. Developing companies may be characterized as engaging in a format war if they actively oppose or avoid interoperable open-industry technical standards in favor of their own.
Hi-MD is a magneto-optical disc-based data storage format. It was a further development of the MiniDisc. With its release in later 2004, came the ability to use newly developed, high-capacity 1 gigabyte Hi-MD discs, in the same dimensions as MiniDisc. The last recorder and player was discontinued in 2011. Blank discs stopped production in September 2012.
The 8mm video format refers informally to three related videocassette formats. These are the original Video8 format and its improved successor Hi8, as well as a more recent digital recording format known as Digital8. Their user base consisted mainly of amateur camcorder users, although they also saw important use in the professional television production field.
U-matic or 3⁄4-inch Type E Helical Scan or SMPTE E is an analogue recording videocassette format first shown by Sony in prototype in October 1969, and introduced to the market in September 1971. It was among the first video formats to contain the videotape inside a cassette, as opposed to the various reel-to-reel or open-reel formats of the time. The videotape is 3⁄4 in (19 mm) wide, so the format is often known as "three-quarter-inch" or simply "three-quarter", compared to open reel videotape formats in use, such as 1 in (25 mm) type C videotape and 2 in (51 mm) quadruplex videotape.
Gapless playback is the uninterrupted playback of consecutive audio tracks, such that relative time distances in the original audio source are preserved over track boundaries on playback. For this to be useful, other artifacts at track boundaries should not be severed either. Gapless playback is common with compact discs, gramophone records, or tapes, but is not always available with other formats that employ compressed digital audio. The absence of gapless playback is a source of annoyance to listeners of music where tracks are meant to segue into each other, such as some classical music, progressive rock, concept albums, electronic music, and live recordings with audience noise between tracks.
A PCM adaptor is a device that encodes digital audio as video for recording on a videocassette recorder. The adapter also has the ability to decode a video signal back to digital audio for playback. This digital audio system was used for mastering early compact discs.
SonicStage is a discontinued software product from Sony that is used for managing portable devices when they are plugged into a computer running Microsoft Windows. It comprises a music player and library manager, similar to iTunes, Windows Media Player and RealPlayer. It is used to manage the library of ATRAC and MP3 recordings on a PC.
Subcode or subchannel data refers to data contained in a compact disc (CD) in addition to digital audio or user data, which is used for control and playback of the CD. The original specification was defined in the Red Book standard for Compact Disc Digital Audio, though further specifications have extended their use.
An ATRAC CD is a compressed audio optical disc containing compressed digital audio in the ATRAC3 or ATRAC3plus formats, which are part of Sony's ATRAC family of proprietary audio compression algorithms.
References
↑ Woudenberg, Eric. "Sony MZ-1". Retrieved 30 July 2022.
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