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| | Magnetic tape - Wikipedia, the free encyclopedia |
 | | Magnetic tape was first used to record computer data in 1951 on the Mauchly-Eckert UNIVAC I. | | | The use of magnetic tape for data storage has been one of the constants of the computer industry. | | | Nearly all recording tape is of this type, whether used for video, audio storage or general purpose digital data storage using a computer. |
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http://en.wikipedia.org/wiki/Magnetic_tape
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| | Magnetic Tape Storage and Handling--What Can Go Wrong with Magnetic Media? |
| | These numbers, in binary form, are written to the tape, rather than the analog signal. | | | The Magnetic-Media Industries Association of Japan (MIAJ) has concluded that the shelf life of magnetic tape under normal conditions is controlled by the binder rather than the magnetic particles ("DDS Specs Drive DAT Reliability," Computer Technology Review, 13 (5), May 1993: 30). | | | Thus, some tapes will retain information, which is stored magnetically, longer than others. |
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http://www.clir.org/pubs/reports/pub54/2what_wrong.html
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| | Magnetic Tape |
| | Because a tapes magnetic domains are naturally in a random state of disorganization (considered as zero potential) it requires a great deal of energy to cause them to shift into organized patterns. | | | However, low output tape can only be played on machines designed for its use otherwise distortion and a host of other problems can occur. | | | However, because of the high level of energy stored in the tape, print through can be quite noticeable and once it has occurred, it cannot be changed. |
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http://www.ptme.com/et/audio/reference/recording/magnetic.htm
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| | Magnetic |
| | The stock of original data on magnetic tape may be approximated by adding the yearly flow of original data over the course of the expected lifetime of the medium. | | | Almost all of this tape is used for the storage of original data. | | | If 90% of the computer tape distributed annually were used for copies, this would constitute 2,250 petabytes of copied data for the year 2002. |
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http://www.sims.berkeley.edu:8000/research/projects/how-much-info-2003/magnetic.htm
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| | JRF Magnetic Sciences: Tape Heads-An Introduction |
| | Since a large percentage of head problems stem from tape path and/or initial head misalignment, it is very important to start with a known reference when re-installing new or refurbished heads. | | | The data accumulated in our studies over the years indicates that, in most cases, magnetic heads failing to meet operational spec exhibit wear pattern depths that are less than 50% of initial (new) tip depth. | | | Since output is a function of the number of turns and efficiency of the core material, level will not drop as a result of the reduction of inductance. |
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http://www.jrfmagnetics.com/tapeheadintro.html
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| | MAGNETIC TAPE DRIVE APPLICATIONS AND MARKETS |
| | With these features, digital magnetic tape drives are used in a wide variety of applications, but the extent of the usage depends upon the size of the computer system. | | | 2.5 where the various applications for digital magnetic tape are shown across the top, and the computer systems they are used in are shown down the side. | | | Compact tape drives are small form factor drives, which are typically used for disk backup on personal computers as well as on a network. |
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http://www.wtec.org/loyola/hdmem/02_04.htm
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| | Dictionary of Computers - magnetic tape |
| | In computing, magnetic tape was first used to record data and programs in 1951 as part of the UNIVAC 1 system. | | | Since then it has been largely replaced by magnetic discs as a working medium, although tape is still used to make backup copies of important data. | | | For mass storage on commercial mainframe computers, large reel-to-reel tapes are still used, but cartridges are becoming popular. |
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http://www.tiscali.co.uk/reference/dictionaries/computers/data/m0019404.html
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| | Mag Tape Life Expectancy 10-30 years |
| | He states "digital magnetic tape should be copied once a year to guarantee that none of the information is lost," and "media with increased longevity are not on the horizon." Both of these statements are grossly inaccurate for current digital tape formats. | | | To realize lifetimes greater than this, one would be required to archive the recording system, system software, operating system, computer hardware, operations manuals, and ample spare parts along with the recorded media. | | | Given the fact that digital recording technologies can be supplanted by a newer format every 5 to 10 years, the bigger problem facing archivists is the lifetime of the technology, not the lifetime of the medium. |
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http://palimpsest.stanford.edu/bytopic/electronic-records/electronic-storage-media/bogart.html
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| | Magnetic Recording - an introduction |
| | The problem occurs when magnetically induced information in one layer of the tape induces magnetic changes in the next layer of tape wound on the reel. | | | The external field for which the remanent magnetization goes to zero is termed the coercivity Hc. | | | Following deposition, the magnetic particles are then oriented with an applied magnetic field. |
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http://www.ee.washington.edu/conselec/CE/kuhn/magtape/95x1.htm
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| | VidiPax: Magnetic Tape Deterioration: Tidal Wave at Our Shores |
| | The fact that digital tape is often far thinner than analog tape and uses azimuth recording which depends on precise angle and phase relationships for proper play back may create a problem in future years when the tape has stretched, contracted, and potentially become affected by binder breakdown of one sort or another. | | | Many aspects of magnetic media handling are based on intelligent guessing and general industry practice handed down from technician to technician with little real data to back up what procedure should be followed or why. | | | The magnitude of the problem of magnetic tape deterioration is just starting to be realized. |
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http://www.vidipax.com/articles/tidal.html
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| | Jan's Computer Basics:6-8 Magnetic Tape Storage |
| | The tape is divided into logical blocks, as a floppy is divided into tracks and sectors. | | | ust as floppy disks and hard disks have several different formats, so do magnetic tapes. | | | Keeping sets of backups like this minimizes the amount of data loss when the computer system goes down. |
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http://www.jegsworks.com/Lessons/lesson6/lesson6-8.htm
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| | IBM Archives: IBM 3420 magnetic tape drive |
| | To improve the operation of tape and move some of its control function out of the central processing unit (CPU), some instructions were moved to the tape drive. | | | An optical tachometer can precisely control the speed of the capstan to help minimize tape stretching and breaking. | | | Two Channel Switch - This allow the 3803 to be switched between two different channels under program control. |
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http://www-03.ibm.com/ibm/history/exhibits/storage/storage_3420.html
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| | Bill Vermillion on Magnetic Tape Alignment |
| | All you do at this point is set the output to be 0 vu by matching the output level to the level you had previously set on playback of the alignment tape. | | | There are some that insist it be done every time, but in our studio we felt that it was easier to introduce problems with it. | | | Since we have now calibrated the record level against the play level, if your machine has problems in this area, we can now change the levels. |
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http://www.bilver.com/tape.html
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| | SPECS BROS. Audio & Video Tape Restoration |
| | Still, we constantly see tapes pulled from storage in a state of advanced decay, rendering the materials unusable. | | | But, just like any other material, magnetic tape decays when exposed to harmful environments. | | | Standards setting bodies such as SMPTE and ANSI are creating, reviewing and publishing guidelines on tape storage and handling. |
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http://www.specsbros.com/restore.html
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| | Magnetic Tape's Data-Storage Edge - NewsFactor Network |
| | The researchers -- Bharat Bhushan, a professor of mechanical engineering, and Anton Goldade, a graduate student -- actually are focusing on the edge of magnetic tape, where most of the microscopic tears occur. | | | Some experts believe the days of using magnetic tape as a storage medium are numbered, but OSU mechanical engineering professor Bharat Bhushan vehemently disagrees. | | | Compounding the problem, tapes with more tracks would have to wind and unwind many more times in a tape machine, which could make the tears grow even larger, Bhushan said. |
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http://www.newsfactor.com/perl/story/21299.html
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| | A Selected Bibliography of Histories of Magnetic Tape Sound Recording |
| | Comparing mechanical, magnetic, and electroacoustic properties of studio tapes, the steps in development that had to be taken to reach the high-quality standard required for modern analog recording are outlined. | | | In addition this investigation shows possible areas for the further development of the magnetic tape system. | | | A concise survey from the mid-1950s traces development leading up to modern analog tape technology. |
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http://www.aes.org/aeshc/docs/bibliographies/histmagrecbib.html
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| | Howstuffworks "How Tape Recorders Work" |
| | In the computer realm, magnetic recording is used on floppy disks, hard disks and magnetic tape as the main method for data storage. | | | You will learn that the reason why magnetic recording is so popular is because it an easy and inexpensive technology with good medium-term (10 to 20 years) storage characteristics. | | | Magnetic recording is a backbone technology of the electronic age. |
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http://www.howstuffworks.com/cassette.htm
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| | Compact audio cassette - Wikipedia, the free encyclopedia |
| | The typical encoding method was simple FSK which resulted in typical data rates 500 to 2000 bit/s, although some games used special faster loading routines, up to around 4000 bit/s. | | | One problem occurs when iron oxide (or similar) particles from the tape itself become lodged in the read head. | | | Magnetic Recording: The First 100 Years, (New York: The Institute of Electrical and Electronics Engineers, 1999). |
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http://en.wikipedia.org/wiki/Compact_audio_cassette
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| | Electric Power Production From Magnetic Tapes: Portable Power Supplies |
| | At first, the present technical information is provided to the Magnetic Data Storage Industry, as a Jobs protection due to occasional attempts of some fuels industry minorities to attack against magnetic data storage products. | | | Parasitic magnetic fields, meaning that the entire head is in cover of mumetal like the Standardized Magnetic Heads. | | | In my project, we have recording and reproduction of waveform whose period has only positive values. |
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http://www.energynews.gr/electric.htm
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| | History of Magnetic Tape |
| | One of the first problems he faced was that the oxide supplied by Brush turned out to be nothing more than iron, and that once applied to a paper backing it continued to rust, changing its chemical and magnetic properties. | | | But the prospects of being merely a producer, with huge development costs and limited return, did not interest 3M. | | | Once ABC began to switch to tape, it made two copies of each program and started them simultaneously on playback decks. |
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http://www.tvhandbook.com/History/History_tape.htm
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| | Magnetic Recording History Pictures |
| | On the contrary, BASF had the knowledge necessary for the development of magnetic tape. | | | Curt Stille developed in 1925 the Dailygraph magnetic wire recorder as a dictating machine. | | | Poulsen stopped his work on magnetic recording and turned to radio after 1902, and only a small number of his machines were made in Denmark and Germany. |
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http://history.acusd.edu/gen/recording/tape.html
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| | Magnetic Tape |
| | one of the many types of magnetic storage devices available | | | However large amounts of information can be stored within magnetic tape. | | | A recording medium consisting of a thin tape with a coating of a fine magnetic material, used for recording analogue or digital data. |
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http://doit.ort.org/course/storage/341.htm
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| | Magnetic tape recording specifications |
| | Order this information in Adobe PDF Printable Format | | | Set the recorder's reproduce electronics output level to a 0-dB reference on the VTVM. | | | While recording and reproducing, set the output level of the tape recorder's reproduce electronics to a level that displays 0-dB reference on the VTVM. |
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http://www.tpub.com/neets/book23/101.htm
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| | Tape Recording |
| | The tiny granules are fixed on a polyester film base, but the direction and extent of their magnetization can be changed to record an input signal from a tape head. | | | This means that for a signal with twice the frequency, the output signal is twice as great for the same degree of magnetization of the tape. | | | Problem: The magnetization of the magnetic emulsion is proportional to the recorded signal while the induced voltage in the coil is proportional to the rate at which the magnetization in the coil changes. |
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http://hyperphysics.phy-astr.gsu.edu/hbase/audio/tape.html
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| | Magnetic Tape Storage and Handling |
| | The initiative encourages new techniques and technologies to manage chemical deterioration in library and archival collections and to extend their useful life. | | | Key Features of Access and Archival Storage of Magnetic Tape | | | Ampex Guide to the Care and Handling of Magnetic Tape |
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http://www.clir.org/pubs/reports/pub54
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