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Magnetic storage and magnetic recording are terms from engineering referring to the storage of data on a magnetized medium. Engineering is the Discipline and Profession of applying technical and scientific Knowledge and Debt AIDS Trade in Africa (or DATA) is a Multinational non-government organization founded in January 2002 in London by U2 's A magnet (from Greek grc μαγνήτης λίθος " Magnesian stone" is a material or object that produces a Magnetic field. Magnetic storage uses different patterns of magnetization in a magnetizable material to store data and is a form of non-volatile memory. Magnetization is defined as the quantity of Magnetic moment per unit volume Non-volatile memory, nonvolatile memory, NVM or non-volatile storage, is Computer memory that can retain the stored information The information is accessed using one or more read/write heads. Disk read/write heads are mechanisms that read Data from or write data to Disk drives The heads have gone through a number of changes over the years As of 2007, magnetic storage media, primarily hard disks, are widely used to store computer data as well as audio and video signals. A hard disk drive ( HDD) commonly referred to as a hard drive, hard disk, or fixed disk drive, is a Non-volatile storage device In Computer science, data is anything in a form suitable for use with a Computer. Sound' is Vibration transmitted through a Solid, Liquid, or Gas; particularly sound means those vibrations composed of Frequencies Video is the technology of electronically capturing, Recording, processing storing transmitting and reconstructing a sequence of Still images In the field of computing, the term magnetic storage is preferred and in the field of audio and video production, the term magnetic recording is more commonly used. The distinction is less technical and more a matter of preference.

Contents

History

Magnetic storage was first suggested by Oberlin Smith in 1888. Oberlin Smith (1840-1926 was an Engineer who published one of the earliest works dealing with Magnetic recording in 1888 The first working magnetic recorder was invented by Valdemar Poulsen in 1898. Valdemar Poulsen ( November 23, 1869, in Copenhagen – July 23, 1942) was a Danish Engineer. Poulsen's device recorded a signal on a wire wrapped around a drum. In the fields of communications, Signal processing, and in Electrical engineering more generally a signal is any time-varying or spatial-varying quantity In 1928, Fritz Pfleumer developed the first magnetic tape recorder. Fritz Pfleumer ( 20 March 1881 in Salzburg – 29 August 1945 in Radebeul) was a German - Austrian Early magnetic storage devices were designed to record analog audio signals. An analog or analogue signal is any continuous signal for which the time varying feature (variable of the signal is a representation of some other Modern magnetic storage devices are designed for recording digital data. A digital system uses discrete (discontinuous values usually but not always Symbolized Numerically (hence called "digital" to represent information for

In early computers, magnetic storage was also used for primary storage in a form of magnetic drum, or core memory, core rope memory, thin film memory, twistor memory or bubble memory. Computer data storage, often called storage or memory, refers to Computer components devices and recording media that retain digital Drum memory is a magnetic Data storage device and was an early form of Computer memory widely used in the 1950s and into the 1960s invented by Gustav Tauschek Magnetic core memory, or ferrite-core memory, is an early form of Random access Computer memory. Core rope memory is a form of Read-only memory (ROM for Computers first used by early NASA Mars probes and then in the Apollo Twistor is a form of Computer memory, similar to Core memory, formed by wrapping or closing Magnetic tape around a current-carrying wire Prehistory twistor memory Bubble memory is largely the brainchild of a single person Andrew Bobeck. Unlike modern computers, magnetic tape was also often used for secondary storage.

Technical details

Access method

Magnetic storage media can be classified as either sequential access memory or random access memory although in some cases the distinction is not perfectly clear. In computing Sequential access memory ( SAM) is a class of Data storage devices that read their data in sequence In the case of magnetic wire, the read/write head only covers a very small part of the recording surface at any given time. Accessing different parts of the wire involves winding the wire forward or backward until the point of interest is found. The time to access this point depends on how far away it is from the starting point. The case of ferrite-core memory is the opposite. Every core location is immediately accessible at any given time.

Hard disks and modern linear serpentine tape drives do not precisely fit into either category. Both have many parallel tracks across the width of the media and the read/write heads take time to switch between tracks and to scan within tracks. Different spots on the storage media take different amounts of time to access. For a hard disk this time is typically less than 10 ms, but tapes might take as much as 100 s.

Current usage

As of 2007, common uses of magnetic storage media are for computer data mass storage on hard disks and the recording of analog audio and video works on analog tape. Magnetic tape is a medium for Magnetic recording generally consisting of a thin magnetizable coating on a long and narrow strip of Plastic. Since much of audio and video production is moving to digital systems, the usage of hard disks is expected to increase at the expense of analog tape. Digital tape and tape libraries are popular for the high capacity data storage of archives and backups. Magnetic tape has been used for Data storage for over 50 years In Computer storage, a tape library, sometimes called a tape silo, or tape jukebox, is a storage device which contains one or more Tape drives Floppy disks see some marginal usage, particularly in dealing with older computer systems and software. A floppy disk is an increasingly Obsolete data storage medium that is composed of a disk of thin flexible ("floppy" Magnetic storage medium encased Magnetic storage is also widely used in some specific applications, such as bank checks (MICR) and payment cards (mag stripes). Magnetic Ink Character Recognition, or MICR (pronounced my-ker or micker) a character recognition technology adopted mainly by the banking industry to A magnetic stripe card is a type of card capable of storing Data by modifying the Magnetism of tiny iron-based magnetic particles on a band of magnetic material

Future

A new type of magnetic storage, called MRAM, is being produced that stores data in magnetic bits based on the GMR effect. Magnetoresistive Random Access Memory ( MRAM) is a non-volatile computer memory ( NVRAM) technology which has been under development since Debt AIDS Trade in Africa (or DATA) is a Multinational non-government organization founded in January 2002 in London by U2 's Giant magnetoresistance (GMR is a quantum mechanical effect a type of Magnetoresistance effect observed in thin film structures composed of alternating Ferromagnetic Its advantage is non-volatility, low power usage, and good shock robustness. However, with storage density and capacity orders of magnitude smaller than e. g. an HDD, MRAM is a niche application for situations where small amounts of storage with a need for very frequent updates are required, which flash memory could not support. A hard disk drive ( HDD) commonly referred to as a hard drive, hard disk, or fixed disk drive, is a Non-volatile storage device Flash memory is non-volatile computer memory that can be electrically erased and reprogrammed

See also

External links

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