The Microcassette (often written generically as microcassette ) is an audio storage medium, introduced by Olympus in 1969.
65-572: It has the same width of magnetic tape as the Compact Cassette but in a cassette roughly one quarter the size. By using thinner tape and half or a quarter the tape speed, microcassettes can offer comparable recording time to the compact cassette but in a smaller package. Microcassettes have mostly been used for recording voice . In particular, they are commonly used in dictation machines and answering machines . Microcassettes have also been used in computer data storage and to record music . For
130-551: A PC and integrates with analytical software to evaluate the quality of tapes. This device is also rebranded as the Spectra MLM Reader and the Maxell LTO Cartridge Memory Analyzer. Proxmark3 and other generic RFID readers are also able to read data. The LTO cartridge label in tape library applications commonly uses the bar code symbology of USS-39 . A description and definition is available from
195-400: A cartridge is inserted. When a more thorough cleaning is required the drive signals this on its display and/or via Tape Alert flags. Cleaning cartridge lifespan is usually from 15 to 50 cleanings. There are 2 basic methods of initiating a cleaning of a drive: robot cleaning and software cleaning. In addition to keeping the tape drive clean, it is also important to keep the media clean. Debris on
260-554: A cartridge; throughout newer generations, the capacity has increased while maintaining the same physical size. They feature built-in encryption for safer storing and transporting of data, and the partition feature enables usage of LTFS , generally having higher capacity, better long-term stability, and lower unit cost than other data storage formats. There are also write once read many LTO cartridges, useful to protect against accidental or malicious deletion. Half-inch (12.65 mm) wide magnetic tape has been used for data storage since
325-768: A cleaning strategy that will prevent the drive from using the cleaning tape if it is not needed. In a change of strategy, HP LTO Gen 2, 3 and 4 drives will always clean when a Universal Cleaning Cartridge is inserted, whether the drive requires cleaning or not. As of 2019 , compliance-verified licensed manufacturers of current LTO technology mechanisms are IBM , Hewlett-Packard , and Quantum , although both Hewlett Packard and Quantum have stopped new development of drive mechanisms. The mechanisms, also known as tape drives or streamers, are available in Full-height and Half-height form factors. These drives are frequently packaged into external desktop enclosures or carriers that fit into
390-499: A coiled serpent and is known as linear serpentine recording. When the first data band is filled (they are filled in 3, 1, 0, 2 order across the tape), the head assembly is moved to the second data band and a new set of wraps is written in the same linear serpentine manner. The total number of tracks on the tape is (4 data bands) × (11 to 52 wraps per band) × (8, 16, or 32 tracks per wrap). For example, an LTO-2 tape has 16 wraps per band, and thus requires 64 passes to fill. Since LTFS
455-478: A fixed ratio, commonly 2:1. See Compression below for algorithm descriptions and the table above for LTO's advertised compression ratios. The units for data capacity and data transfer rates generally follow the "decimal" SI prefix convention (e.g. mega = 10 ), not the binary interpretation of a decimal prefix (e.g. mega = 2 ). Minimum and maximum reading and writing speeds are drive-dependent. Drives usually support variable-speed operation to dynamically match
520-664: A large file or a large selection of files (up to 1.5 TB for LTO-5 or 2.5 TB for LTO-6) to an LTFS-formatted tape, allows easy exchange of data to a collaborator or saving of an archival copy. Throughout the history of the format, there have been six compliance-verified, licensed manufacturers of LTO technology media: EMTEC , Imation , Fujifilm , Maxell , TDK , and Sony . All other brands of media are (or were) manufactured by these companies under contract. Since its bankruptcy in 2003, EMTEC no longer manufactures LTO media products. Imation ended all magnetic tape production in 2011, but continued making cartridges using TDK tape for
585-478: A robotic tape library. In the course of its existence, LTO has succeeded in completely displacing all other low-end/mid-range tape technologies such as AIT , DLT , DAT/DDS , and VXA . And after the exit of Oracle StorageTek T10000 of the high-end market, only the IBM 3592 series and LTO are still under active development. LTO also competes against hard disk drives (HDDs), and its continuous improvement has prevented
650-421: A single reel. Mechanisms (a.k.a. tape drives , streamers) extract the tape from the cartridge and spool it up on a second reel in the mechanism, reading or writing data as the tape moves between reels. Robotic libraries exist that can hold hundreds or thousands of LTO cartridges and dozens of mechanisms. The original version of LTO Ultrium, called LTO-1, was released in 2000 and stored 100 GB of data in
715-419: A single, one-way, end-to-end pass that is called a "wrap". The tape head shifts laterally to access the different wraps within each band and also to access the other bands. Writing to a blank tape starts at band 0, wrap 0, a forward wrap that runs from the beginning of the tape (BOT) to the end of the tape (EOT) and includes a track that runs along one side of the data band. The next wrap written, band 0, wrap 1,
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#1732849086020780-491: A standard XML schema , is readable by any LTFS-aware system and can be modified separately from the data it describes. The Linear Tape File System Technical Work Group of the Storage Networking Industry Association (SNIA) works on the development of the format for LTFS. Without LTFS, data is generally written to tape as a sequence of nameless "files", or data blocks, separated by "filemarks". Each file
845-403: A take-up reel. When a cartridge is not in a drive, the pin is held in place at the opening of the cartridge with a small spring. A common reason for a cartridge failing to load into a drive is the misplacement of the leader pin as a result of the cartridge having been dropped. The plastic slot where the pin is normally held is deformed by the drop and the leader pin is no longer in the position that
910-399: A tape appear to behave like a disk, it does not change the fundamentally sequential nature of tape. Files are always appended to the end of the tape. If a file is modified and overwritten or removed from the volume, the associated tape blocks used are not freed up: they are simply marked as unavailable, and the used volume capacity is not recovered. Data is deleted and capacity recovered only if
975-511: A tape written on any one vendor's drive should be fully readable on any other vendor's drive that is compatible with that generation of LTO. LTO Ultrium tape is laid out with four wide data bands sandwiched between five narrow servo bands. The tape head assembly, that reads from and writes to the tape, straddles a single data band and the two adjacent servo bands. The tape head has 8, 16, or 32 data read/write head elements and 2 servo read elements. The set of 8, 16, or 32 tracks are read or written in
1040-527: A thin, magnetizable coating on a long, narrow strip of plastic film . It was developed in Germany in 1928, based on the earlier magnetic wire recording from Denmark. Devices that use magnetic tape can with relative ease record and play back audio, visual, and binary computer data. Magnetic tape revolutionized sound recording and reproduction and broadcasting. It allowed radio, which had always been broadcast live, to be recorded for later or repeated airing. Since
1105-446: A time, via a non-contacting passive 13.56 MHz RF interface. This memory is used to identify tapes, to help drives discriminate between different generations of the technology, and to store tape-use information. Every LTO drive has a cartridge memory reader in it. The non-contact interface has a range of 20 mm. External readers are available, both built into tape libraries and PC based. One such reader, Veritape, connects by USB to
1170-484: A while. In 2017 they withdrew from all data storage markets, renaming themselves Glassbridge Enterprises. TDK withdrew from the data tape business in 2014. Maxell produced cartridges up to and including generation 6 in 2012, but has since withdrawn from the market. Verbatim and Quantegy both licensed LTO technology, but never manufactured their own compliance-verified media. As of 2019 , only Fujifilm and Sony continue to manufacture current LTO media. In addition to
1235-412: A write-protect switch in the bottom-left corner, although it is easily overridden by the user and doesn't provide any protection from accidental deletion by, for example, misidentification of a cartridge. An LTO-3 or later drive will not erase or overwrite data on a WORM cartridge, but will read it. A WORM cartridge is identical to a normal tape cartridge of the same generation with the following exceptions:
1300-412: Is AES - GCM , which is an authenticated, symmetric block cipher. The same key is used to encrypt and decrypt data, and the algorithm can detect tampering with the data. Tape drives, tape libraries, and backup software can request and exchange encryption keys using either proprietary protocols, or an open standard like OASIS 's Key Management Interoperability Protocol . The LTO-5 specification introduced
1365-422: Is a reverse wrap (EOT to BOT) and includes a track along the other side of the band. Wraps continue in forward and reverse passes, with slight shifts toward the middle of the band on each pass. The tracks written on each pass partially overlap the tracks written on the previous wrap of the same direction, like roof shingles . The back and forth pattern, working from the edges into the middle, conceptually resembles
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#17328490860201430-423: Is a system for storing digital information on magnetic tape using digital recording . Tape was an important medium for primary data storage in early computers, typically using large open reels of 7-track , later 9-track tape. Modern magnetic tape is most commonly packaged in cartridges and cassettes, such as the widely supported Linear Tape-Open (LTO) and IBM 3592 series. The device that performs
1495-443: Is always an even number). LTO tape is designed for 15 to 30 years of archival storage. If tapes are archived for longer than 6 months they have to be stored at a temperature between 16 and 25 °C (61 and 77 °F) and between 20 – 50% RH. Both drives and media should be kept free from airborne dust or other contaminants from packing and storage materials, paper dust, cardboard particles, printer toner dust etc. Depending on
1560-421: Is an open standard, LTFS-formatted tapes are usable by a wide variety of computing systems. The block structure of the tape is logical so interblock gaps, file marks, tape marks and so forth take only a few bytes each. In LTO-1 and LTO-2, this logical structure has CRC codes and compression added to create blocks of 403,884 bytes. Another chunk of 468 bytes of information (including statistics and information about
1625-478: Is magnetic tape used for storing video and usually sound in addition. Information stored can be in the form of either an analog or digital signal . Videotape is used in both video tape recorders (VTRs) and, more commonly, videocassette recorders (VCRs) and camcorders . Videotapes have also been used for storing scientific or medical data, such as the data produced by an electrocardiogram . Some magnetic tape-based formats include: Magnetic-tape data storage
1690-431: Is typically an archive of data organized using some variation of tar format or proprietary container formats developed for and used by backup programs. In contrast, LTFS utilizes an XML-based index file to present the copied files as if organized into directories. This means LTFS-formatted tape media can be used similarly to other removable media ( USB flash drive , external hard disk drive , and so on). While LTFS can make
1755-466: Is very similar to the algorithm ALDC which is a variation of LZS . LTO-1 through LTO-5 are advertised as achieving a "2:1" compression ratio, while LTO-6 and LTO-7, which apply a modified SLDC algorithm using a larger history buffer, are advertised as having a "2.5:1" ratio. This is inferior to slower algorithms such as gzip , but similar to lzop and the high speed algorithms built into other tape drives. The actually achievable ratio generally depends on
1820-426: Is within one track. Also, when data is written to the tape it is verified by reading it back using the read heads that are positioned just "behind" the write heads. This allows the drive to write a second copy of any data that fails the verify without the help of the host system. While specifications vary between different drives, a typical LTO-7 drive will take about 15 seconds to load the tape and 20 seconds to unload
1885-442: The 1950s, starting with the open reel formats IBM 7-track and later IBM 9-track . In the mid-1980s, smaller, enclosed, single-reel cartridge formats were developed by IBM and DEC . Although the physical tape was nominally the same width in these new formats and the preceding open-reel formats, the technologies and intended markets were significantly different and there was no compatibility between them. The IBM 3480 tape format
1950-641: The Automatic Identification Manufacturers (AIM) specification Uniform Symbol Specification (USS-39) and the ANSI MH10.8M-1993 ANSI Barcode specification. The tape inside an LTO cartridge is wound around a single reel. The end of the tape is attached to a perpendicular leader pin that is used by an LTO drive to reliably grasp the end of the tape and mount it in a take-up reel inside the drive. Older single-reel tape technologies, such as 9-track tape and DLT , used different means to load tape onto
2015-569: The MC60, gives 30 minutes recording per side at its standard speed of 2.4 cm/s, and double that duration at 1.2 cm/s; an MC90, giving 45 minutes per side @ 2.4 cm/s, is also available from a few manufacturers. Unlike the Compact Cassette, a choice of recording speeds was provided on the original recorders and many others; the tape also spools in the opposite direction, from right to left. For transcription purposes, continuously variable speed
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2080-403: The cartridge memory identifies it to the drive as WORM, the servo tracks are slightly different to allow verification that data has not been modified, the bottom half of the cartridge shell is gray, and it may come with tamper-proof screws. WORM-capable drives immediately recognize WORM cartridges and include a unique WORM ID with every dataset written to the tape. There is nothing different about
2145-415: The compressibility of the data, e.g. for precompressed data such as ZIP files, JPEG images, and MPEG video or audio the ratio will be close to or equal to 1:1. New for LTO-3 was write once read many (WORM) capability. This is useful for legal record keeping, and for protection from accidental or intentional erasure, for example from ransomware , or simply human error. Standard LTO cartridges do include
2210-613: The data cartridges, there are also Universal Cleaning Cartridges (UCC), which work with all drives. All formats use the same cartridge dimensions, 102.0 mm × 105.4 mm × 21.5 mm (4.02 in × 4.15 in × 0.85 in). The colors of LTO Ultrium cartridge shells are mostly consistent, though not formally standardized; HP is the notable exception. Sometimes similar, rather than identical, colors are used by different manufacturers (slate-blue and blue-gray; green, teal, and blue-green; dark red and burgundy). WORM (write once, read many) cartridges are two-tone:
2275-458: The data rate flow. This nearly eliminates tape backhitching or "shoe-shining", maximizing overall throughput and device/tape life. The LTO Consortium provide a roadmap of future generations, which state that LTO-10 is expected to have 36 TB of storage and LTO-14 potentially 576 TB. In contrast to other tape technologies, an Ultrium cartridge is rigidly defined by a particular generation of LTO technology and cannot be used in any other way (with
2340-466: The drive expects it to be. The magnetic servo tracks on the tape are factory encoded. Using a bulk eraser, degaussing, or otherwise exposing the cartridge to a strong magnetic field, will erase the servo tracks along with the data tracks, rendering the cartridge unusable. Erasing the data tracks without destroying the servo tracks can be done with an LTO drive or with special equipment. The erasing head used in these erasers has four magnetic poles that match
2405-444: The drive that wrote the data and when it was written) is then added to create a "dataset". Finally error correction bytes are added to bring the total size of the dataset to 491,520 bytes (480 KiB ) before it is written in a specific format across the eight heads. LTO-3 and LTO-4 use a similar format with 1,616,940-byte blocks. The tape drives use a strong error correction algorithm that makes data recovery possible when lost data
2470-467: The drives and/or tapes and can be ignored or enabled. Compression and encryption can also be performed in software prior to the data being sent to the tape drive. However, the partitioning function can only be done in hardware, and the WORM feature requires special WORM tapes. The original LTO specification describes a data compression method LTO-DC , also called Streaming Lossless Data Compression (SLDC). It
2535-492: The early 1950s, magnetic tape has been used with computers to store large quantities of data and is still used for backup purposes. Magnetic tape begins to degrade after 10–20 years and therefore is not an ideal medium for long-term archival storage. The exception is data tape formats like LTO which are specifically designed for long-term archiving. Information in magnetic tapes is often recorded in tracks which are narrow and long areas of information recorded magnetically onto
2600-486: The end of the war. It was only after the war that Americans, particularly Jack Mullin , John Herbert Orr , and Richard H. Ranger , were able to bring this technology out of Germany and develop it into commercially viable formats. Bing Crosby , an early adopter of the technology, made a large investment in the tape hardware manufacturer Ampex . A wide variety of audiotape recorders and formats have been developed since. Some magnetic tape-based formats include: Videotape
2665-424: The exception of LTO-M8, see below). While Ultrium drives are also defined by a particular generation, they are required to have some level of compatibility with older generations of cartridges. The rules for compatibility between generations of drives and cartridges are as follows: Within the compatibility rules stated above, drives and cartridges from different vendors are expected to be interchangeable. For example,
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2730-445: The generation of LTO technology, a single LTO tape should be able to sustain approximately 200-364 full file passes. There is a large amount of lifespan variability in actual use. One full file pass is equal to writing enough data to fill an entire tape and takes between 44 and 208 end-to-end passes. Regularly writing only 50% capacity of the tape results in half as many end-to-end tape passes for each scheduled backup, and thereby doubles
2795-944: The initial plans, only Ultrium was ever produced. So, in common usage, LTO refers to just the Ultrium form factor. Another proposed variation was to have different length tapes. The first generation of Ultrium was going to be available with four types of cartridges, holding 10 GB, 30 GB, 50 GB, and 100 GB. However, only the full length 100 GB tapes were ever produced. As of 2020, nine generations of LTO Ultrium technology have been made available and five more are planned. Between generations, there are strict compatibility rules that describe how and which drives and cartridges can be used together. While data capacity and speed figures vary with uncompressed or compressed data, most manufacturers list compressed capacities and speeds on their marketing material. Capacities are often stated on tapes assuming that data will be compressed at
2860-478: The late 1990s, Quantum's DLT and Sony's AIT were the leading options for high-capacity tape storage for PC servers and UNIX systems. These technologies were tightly controlled by their owners and consequently, there was little to no competition between vendors and the prices were relatively high. Seeing an opportunity, IBM, HP and Seagate formed the LTO Consortium, which introduced a more open format focusing on
2925-469: The latter purpose, devices for recording in stereo were produced in 1982 and, for higher fidelity , microcassettes using Type IV ("metal", i.e. coated with pure metal particles rather than oxide) tape were sold. This was an attempt by Olympus to cash in on the burgeoning Walkman market; one model, the Olympus SR-11, had a built-in radio and offered a stereo tie-clip microphone as an accessory, which made
2990-589: The market. (Battery life also was a problem, because the high bias currents required by Type IV tape, combined with the state of battery technology at the time, meant that brand-new alkaline batteries might give out in two hours when the unit was in recording mode.) "Standard" microcassettes are still used in the underground-music circuits for recording and distributing experimental music and field recordings / sound collage , mostly because of their lo-fi qualities. As of August 2021, Ohm Electric still produces microcassette tapes. The original standard microcassette,
3055-417: The media can be deposited onto drive components that are in contact with the tape. This debris can result in increased media wear which generates more debris. Removing excessive debris from tape can reduce the number of data errors. Cleaning of the media requires special equipment. These cleaners are also used by Spectra Logic to clean new media that is marketed as "CarbideClean" media. HP LTO Gen.1 drives have
3120-412: The partitioning feature that allows a tape to be divided into two separately writable areas, known as partitions. LTO-6 extends the specification to allow 4 separate partitions. The Linear Tape File System (LTFS) is a self-describing tape format and file system made possible by the partition feature. File data and filesystem metadata are stored in separate partitions on the tape. The metadata, which uses
3185-424: The same mid-range market segment. Much of the technology is an extension of the work done by IBM at its Tucson lab during the previous 20 years. In 2000, and around the time of the release of LTO-1, Seagate's magnetic tape division was spun off as Seagate Removable Storage Solutions, later renamed Certance , which was subsequently acquired by Quantum. Initial plans called for two distinct LTO formats: Despite
3250-399: The spacing that exists between adjacent tracks. While good for short-term use, magnetic tape is highly prone to disintegration. Depending on the environment, this process may begin after 10–20 years. Over time, magnetic tape made in the 1970s and 1980s can suffer from a type of deterioration called sticky-shed syndrome . It is caused by hydrolysis of the binder in the tape and can render
3315-625: The tape lifespan. LTO uses an automatic verify-after-write technology to immediately check the data as it is being written, but some backup systems explicitly perform a completely separate tape reading operation to verify the tape was written correctly. This separate verify operation doubles the number of end-to-end passes for each scheduled backup, and reduces the tape life by half. The original release of LTO technology defined an optional data compression feature. Subsequent generations of LTO have introduced new technologies, including WORM, encryption, and partitioning features. These features are built into
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#17328490860203380-411: The tape medium in a WORM cartridge. The LTO-4 specification added a feature to allow LTO-4 drives to encrypt data before it is written to tape. All LTO-4 drives must be aware of encrypted tapes, but are not required to support the encryption process. All current LTO manufacturers support encryption natively enabled in the tape drives using Application Managed Encryption (AME). The algorithm used by LTO-4
3445-670: The tape unusable. Since the introduction of magnetic tape, other technologies have been developed that can perform the same functions, and therefore, replace it. Such as for example, hard disk drives in computers replacing cassette tape readers such as the Atari Program Recorder and the Commodore Datasette for software, CDs and MiniDiscs replacing cassette tapes for audio, and DVDs replacing VHS tapes. Despite this, technological innovation continues. As of 2014 Sony and IBM continue to advance tape capacity. Magnetic tape
3510-452: The tape, which are separate from each other and often spaced apart from adjacent tracks. Tracks are often parallel to the length of the tape, in which case they are known as longitudinal tracks, or diagonal relative to the length of the tape in helical scan . There are also transverse scan and arcuate scanning, used in Quadruplex videotape . Azimuth recording is used to reduce or eliminate
3575-419: The tape. These drives have an average rewind time of 60 seconds and an average access time (from beginning of tape) of about 56 seconds. Because of serpentine writing methods, rewinding often takes less time than the maximum. If a tape is written to full capacity, there is no rewind time, since the last pass is a reverse pass leaving the head at the beginning of the tape (number of tracks ÷ tracks written per pass
3640-455: The top half of the shell is the normal color of that generation for that manufacturer, and the bottom half of the shell is a light gray. Every LTO cartridge has a cartridge memory chip inside it. It is made up of 511, 255, or 128 blocks of memory, where each block is 32 bytes for a total of 16 KiB for LTO-6 to 8; 8 KiB for LTO-4 and 5; and 4 KiB on LTO-1 to 3 and cleaning cartridges. This memory can be read or written, one block at
3705-425: The unit somewhat popular with concert-goers who wanted to record the concerts they attended without drawing attention to themselves with larger, bulkier full-sized cassette recorders. Both of these "high-fidelity" microcassette recorders and the special Type IV blanks they required were relatively expensive and of limited availability, so the system was not widely adopted and Olympus phased them out after two years on
3770-471: The whole tape is reformatted. In spite of these disadvantages, there are several use cases where LTFS-formatted tape is superior to disk and other data storage technologies. While LTO seek times can range from 10 to 100 seconds, the streaming data transfer rate can match or exceed disk data transfer rates. Additionally, LTO cartridges are easily transportable and the latest generation can hold more data than other removable data storage formats. The ability to copy
3835-401: The width and the location of the data bands. The gaps between the poles correspond to the servo tracks, which are not erased. Tapes erased by this equipment can be recorded again. Although keeping a tape drive clean is important, normal cleaning cartridges are abrasive and frequent use will shorten the drive's lifespan. LTO drives have an internal tape head cleaning brush that is activated when
3900-460: The writing or reading of data is called a tape drive . Autoloaders and tape libraries are often used to automate cartridge handling and exchange. Compatibility was important to enable transferring data. Linear Tape-Open Linear Tape-Open ( LTO ), also known as the LTO Ultrium format, is a magnetic tape data storage technology used for backup , data archiving, and data transfer. It
3965-553: Was designed to meet the demanding requirements of its mainframe products. DEC's CompacTape was targeted at a broader market, including minicomputers and smaller systems. Later on, it was renamed Digital Linear Tape (DLT) and eventually sold to Quantum Corporation . In the late 1980s, Exabyte's Data8 format, derived from Sony's dual-reel cartridge 8 mm video format, saw some popularity, especially with UNIX systems. Sony followed this success with their own now-discontinued 8 mm data format, Advanced Intelligent Tape (AIT). By
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#17328490860204030-546: Was invented for recording sound by Fritz Pfleumer in 1928 in Germany. Because of escalating political tensions and the outbreak of World War II, these developments in Germany were largely kept secret. Although the Allies knew from their monitoring of Nazi radio broadcasts that the Germans had some new form of recording technology, its nature was not discovered until the Allies acquired German recording equipment as they invaded Europe at
4095-467: Was less successful than the microcassette. A couple of products were created to compete with the microcassette. Dictaphone and JVC introduced the picocassette in 1985, which is half the size of the microcassette. In 1992, Sony released the NT memo recording system, which employs a small cassette for digital recording. Magnetic tape Magnetic tape is a medium for magnetic storage made of
4160-455: Was originally developed in the late 1990s as an open standards alternative to the proprietary magnetic tape formats available at the time. Upon introduction, LTO rapidly defined the super tape market segment and has consistently been the best-selling super tape format. The latest generation as of 2021, LTO-9, can hold 18 TB in one cartridge. Cartridges contain hundreds of meters of half-inch (12.65 mm) wide tape media wound onto
4225-496: Was provided on many players. Microcassettes equalisation time constant: Type I (Ferric) at 200μs and Type IV (Metal) at 120μs. The microcassette was beaten to market by the Mini-Cassette , introduced by Philips in 1967. The mini-cassette is almost identical in appearance and dimensions to the microcassette, however it has thicker cogs for its reels and a slightly wider cassette. The mini-cassette, despite making it to market first,
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