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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. | | | Magnetic tape is a non-volatile storage medium consisting of a magnetic coating on a thin plastic strip. |
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http://en.wikipedia.org/wiki/Magnetic_tape
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| | Magnetic Storage |
| | "Magnetic Storage" For the last 30 years the dominant means to store "bytes" of digital data/information was throught the use of magnetic medium and devices. | | | The common diskette or hard drive in a computer are both magnetic based devices for storing data. | | | A new medium of magnetic storage are the "flash ram" key chain storage devices. |
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http://it.wce.wwu.edu/344/hardware/magneticstorage.htm
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| | Magnetic Storage |
| | Magnetic data storage relies on the relationship between electricity and magnetism. | | | An electrical current is also generated when the magnetic field surrounding a conductor changes in strength or polarity (direction). | | | The disks are made from a substrate (underlying layer) of a nonmagnetic material —Mylar plastic for floppy disks, aluminum or glass for hard disks —coated with a layer of iron oxide. |
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http://www3.sympatico.ca/silver.fox/magnetic.html
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| | New magnetic semiconductor material spins hope for quantum computing |
| | Magnetic storage, such as that found in a computer hard drive, relies on the magnetic properties created by an electrons spin. | | | Spintronics would provide the basic properties required for advanced technologies, such as on-chip integration of magnetic storage and electronic processing functions and quantum computing, which depends on coherent spin states to transmit and store information. | | | This is a challenge because most magnetic semiconductors lose their magnetic properties at temperatures well below room temperature, and would require expensive and impractical refrigeration in order to work in an actual computer. |
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http://www.eurekalert.org/pub_releases/2001-07/pnnl-nms073001.php
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| | Magnetic Storage |
| | Magnetic recording has dominated computer storage technology since the 1950s. | | | Magnetic recording uses magnetic heads for data storage and retrieval from rotating magnetic media. | | | Magnetic tape is the most widely utilized media for off-line data storage and backup protection. |
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http://www.arches.uga.edu/~bromil
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| | Hard disk drive design and technology |
| | This requires magnetic heads to fly as close to the disk surface as possible, which forces modern heads to fly at a few nanometers only (compare this to 20,000 nanometers back in 1957!). | | | The storage capacity of this system was 5 MB with the data rate of 12.5 kB/s, and the system was rented to the end user for $130 a month. | | | This current interaction with the media results in magnetization of the media, which direction depends on the current direction in the coil. |
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http://www.usbyte.com/common/HDD.htm
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| | Magnetic storage |
| | Superconducting Magnetic Energy Storage System 6 MJ, 750 KVA Superconducting Magnetic Energy Storage System. | | | Optical Storage Solutions, Inc. Buys, sells and repairs a variety of optical and magnetic storage devices. | | | Save-A-File Systems Document storage, office records storage, and magnetic media storage. |
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http://www.serebella.com/encyclopedia/article-Magnetic_storage.html
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| | Magnetic storage - Wikipedia, the free encyclopedia |
| | Magnetic storage was first suggested by Obeline Smith in 1888. | | | Media types that exploit magnetic storage include hard disk and floppy disk drives, zip drives and various tape drives, video cassettes and audio cassettes, magnetic core memory, thin film memory and drum memory. | | | A new type of magnetic storage, called MRAM, is being produced that stores data in terms of polarity rather than electric charge. |
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http://en.wikipedia.org/wiki/Magnetic_storage
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| | Superconducting magnetic energy storage - Wikipedia, the free encyclopedia |
| | There are several reasons for using superconducting magnetic energy storage instead of other energy storage methods. | | | Critical magnetic field - Related to critical current, there is a similar limitation to superconductivity linked to the magnetic field induced in the wire, and this too is a factor at commercial storage levels | | | Also, we can see that the LTSC torus maximum diameter is always smaller for a HTSC magnet than LTSC due to higher magnetic field operation. |
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http://en.wikipedia.org/wiki/Superconducting_magnetic_energy_storage
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| | The future of magnetic data storage technology |
| | Beyond that, the future of magnetic storage technology is unclear. | | | Basic scaling for magnetic recording is the same as the scaling of any three-dimensional magnetic field solution: If the magnetic properties of the materials are constant, the field configuration and magnitudes remain unchanged even if all dimensions are scaled by the factor s, so long as any electrical currents are also scaled by s. | | | Because the particle locations are random with respect to bit and track boundaries, a magnetic noise is observed which is analogous to photon shot noise or other types of quantization noise. |
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http://www.research.ibm.com/journal/rd/443/thompson.html
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| | Magnetic Storage Technologies |
| | Magnetic storage is a storage medium commonly used for large volumes of data (e.g., video, image, or remote sensing data). | | | History of Data Storage Hard Drive Technologies Magnetic Storage Technologies Optical Storage Technologies Electronic Storage Technologies Data Conversion Technologies | | | The first magnetic hard drive for data storage became part of a new machine, the RAMAC (Randon access Method of Accounting and Control). |
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http://www.essdatarecovery.com/magtech.asp
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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. | | | It is important that the magnetic media chosen has a small enough spatial resolution to be able to support the desired frequency range at the given velocity. | | | In deposited magnetic films, the magnetization is typically created by metal crystals formed during the deposition process. |
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http://www.ee.washington.edu/conselec/CE/kuhn/magtape/95x1.htm
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| | Magnetic Tape Storage and Handling--What Can Go Wrong with Magnetic Media? |
| | 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. | | | Sticky tape and sticky shed are commonly used terms to describe the phenomenon associated with deterioration of the magnetic tape binder. |
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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 Core Storage |
| | MAGNETIC CORE STORAGE.\ Magnetic core storage, although not used as much as it used to be, provides an easy way to show the general concepts of memories, including integrated semiconductor and bubble types of memories. | | | Unlike magnetic storage, reading from bubble memory is nondestructive. | | | With core storage, the data is retained even when there is a power failure or breakdown, since data is stored in cores in the form of magnetic charges, not electric current. |
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http://www.tpub.com/incs/3.htm
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| | Magneto-Optical Storage |
| | Unlike traditional magnetic recording systems, which use currents induced in the magnetic heads by the changing magnetic fluxes on the disk surface to read the data, MO systems use polarized light to read the data from the disk. | | | On the other hand, some of the principles of the MO technology (thermally-assisted magnetic recording) may find their way into the most advanced magnetic storage devices of the future. | | | The direction of magnetization in the thin magnetic films (on magnetic rigid disks, for example) can be parallel to the surface (longitudinal recording) or perpendicular to the surface (perpendicular recording). |
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http://www.usbyte.com/common/MOsystems.htm
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| | Magnetic Data Storage |
| | The basic premise of magnetic disk storage is to alter microscopically small areas of the disk surface, so that some areas represent "1s" and some "Os". | | | This is with magnetic disks like: floppy disks, hard disks, magnetic tape, zip disks (100-240mb), super drive. | | | Even though the system area is a small part of the disk compared with the data storage area, it is critical to the operation of the disk as an effective data storage medium for the computer. |
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http://mysite.wanadoo-members.co.uk/pc_home_page/harddisk.htm
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| | JRF Magnetic Sciences: Tape Heads-An Introduction |
| | 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. | | | In practical theory, magnetic heads with edge relief slots are far less susceptible to uneven edge wear problems caused by variations in tape widths and the razor sharp edges generated in the tape slitting processes. | | | Magnetic heads: ah yes, those small blocks of metal with a million wires sticking out the back are probably, inch for inch, the most expensive real estate on your tape recorder. |
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http://www.jrfmagnetics.com/tapeheadintro.html
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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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| | Portable Design - Counterpoint: Magnetic storage solutions vs. flash in portables |
| | Miniaturized rotating magnetic storage devices are available in two flavors. | | | The data-rate benefit of magnetic storage makes the technology more complementary to high-speed I/O solutions such as USB 2.0 On-The-Go (OTG), which supports transfer rates up to 60 Mbytes/s. | | | The second, known as a storage element, is an embedded device that leverages a unique reduced component count to offer high-capacity storage at low cost. |
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http://pd.pennnet.com/Articles/Article_Display.cfm?Section=Articles&Subsection=Display&ARTICLE_ID=209999
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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. | | | Magnetic tape was first used in sound recording in 1947, and made overdubbing possible, unlike the direct-to-disc system it replaced. |
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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. | | | Experience indicates that physical lifetimes for digital magnetic tape are at least 10 to 20 years, a value commensurate with the practical life of the digital recording technology. | | | A chart in the article indicates that the physical lifetimes of magnetic tape are only one to two years. |
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http://palimpsest.stanford.edu/bytopic/electronic-records/electronic-storage-media/bogart.html
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| | Howstuffworks "How Removable Storage Works" |
| | In most cases, removable magnetic storage uses a drive, which is a mechanical device that connects to the computer. | | | The most common and enduring form of removable-storage technology is magnetic storage. | | | When the data is read by the drive, the read head pulls a varying magnetic field across the gap, creating a varying magnetic field in the core and therefore a signal in the coil. |
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http://computer.howstuffworks.com/removable-storage2.htm
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| | Quantum Well Research May Result in Improved Disk-Drive Storage |
| | Today's typical magnetic storage device is a plastic disk coated with multiple layers of metallic thin films. | | | If all magnetic devices could be pushed into the wavelength limit of an electron moving through a solid -- the nanometer scale -- storage capacity would be significantly raised above that of today's record best. | | | A significant step towards downsizing magnetic storage disks has been achieved by researchers working at Berkeley Lab's Advanced Light Source (ALS). |
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http://www.lbl.gov/Science-Articles/Archive/quantum-well-storage.html
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| | GB-160 MAGNETIC/OPTO-MAGNETIC STORAGE: MEDIA AND MATERIALS |
| | BCC's goal in conducting this study was to determine the current worldwide status of the market for magnetic and optical storage media and materials, and to assess the growth potential over a five-year period from 1991 to 1996. | | | The study will be of interest to those who manufacture storage drives, disk and tape media, and the various materials used in media composition: metals, plastics, glass, ceramics, magnetic coatings, and thin films. | | | The value of materials used in the production of magnetic and optical media is detailed by function and type. |
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http://www.bccresearch.com/archive/GB160.html
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| | Movies Show Quick Magnetic Flips |
| | Such improvements in magnetic switching speed may provide a way for disk drive makers to optimize read/write heads for faster data flow and higher storage density. | | | The results help researchers better understand magnetic switching and may help designers optimize magnetic storage devices. | | | In the magnetic structure, a transverse field tells the individual magnetic spins which way to flip. |
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http://focus.aps.org/v7/st3.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. | | | Following deposition, the magnetic particles are then oriented with an applied magnetic field. | | | It is important that the magnetic media chosen has a small enough spatial resolution to be able to support the desired frequency range at the given velocity. |
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http://www.ee.washington.edu/conselec/CE/kuhn/magtape/95x1.htm
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| | Magnetic Storage |
| | One of the first types of magnetic storage was that of the tape. | | | One, the heads are more likely to miswrite due to not having enough time to align the polarities of the magnetic particles, or may misread due to the tape not being under the head long enough. | | | Each platter was coated with magnetic iron oxide (oddly enough, derived from the primer used to paint the San Francisco Golden Gate Bridge). |
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http://www.asuaf.org/~joshua/storage/magnetic.html
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| | VidiPax: Magnetic Tape Deterioration: Tidal Wave at Our Shores |
| | 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. | | | The tape manufacturers have not gone out of their way to point out the problems for obvious reasons, and many of those who "inherit" the job of safeguarding the materials have been trained in paper conservation, not in magnetic media conservation. |
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http://www.vidipax.com/articles/tidal.html
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