Optical storage media ralf steinmetz lars wolf darmstadt university of technology industrial process and system communications. It stores data digitally on a media device and uses a laser to read data from it. A library system that delivers affordable optical disc archiving to the. Magnetic tape is another widely used medium for cold storage, consisting of a tape substrate coated.
Magnetic tape is one of the older types of magnetic storage media. Good examples of a magnetic media and magnetic storage is a tape drive, floppy diskette, and hard drive above is an example of the readwrite head inside a hard drive. Magnetic and optical media are divided into circular. Magnetic tape is a thin strip of magnetic coated plastic which is wrapped onto a reel. A magnetic disk is a disk which stores information magnetically, and is readwritten with a small magnetic head e. Media, in the computer world, refers to various types of data storage.
Consider, for example, the technology of optical audio video disks. Magnetic media definition of magnetic media by medical. Magnetic and optical properties of nanocorrugated co films article pdf available in applied physics letters 9612. Access this webcast to learn how to get the most out of microsoft azure with a backup solution that covers all 4 stages of the cloud journey and ensures both your onprem and cloud data is protected. Optical media refers to any data storage device or equipment that uses optical data storage and retrieval techniques to read and write data. Magnetic storage uses different patterns of magnetisation in a magnetisable material to store data and is a form of nonvolatile memory. Lets explore the capacity of internal and external storage devices.
A general term for storage media that used magnetic storage devices such as tapes, floppies or superfloppies, which were formerly used to archive data. These national industryspecific occupational employment and wage estimates are calculated with data collected from employers of all sizes, in metropolitan and nonmetropolitan areas in every state and the district of columbia, in naics 334600 manufacturing and reproducing magnetic and optical media. Optical storage provides greater memory capacity than magnetic storage. The optical storage has become the most popular media for multimedia applications in the last two decades. The global magnetic and optical media industry is dominated by asian manufacturers. Emphasis is placed on media handling methods and environmental conditions which should be instituted as part, of daytoday and longterm archival storageactivities. Media manufacturers are targeting africa, the middle east, south america, eastern europe, and emerging markets in asia for growth. The multimedia challenge in the past decade data storage media and their capacities saw a dramatic change. Hardware components that readwrite to storage media are called storage devices. What is difference between magnetic and optical storage. Polarization of light is influenced by magnetic characteristics. In this post i have updated some important questions with their answer as a mcq format or quiz format for your upcoming competitive examinations.
Optical media are highdensity storage media with digitally encoded information that is written and read by means of a laser. Emphasis is placed on media handling methods and environmental conditions which. Optical storage technology britannica encyclopedia britannica. In the case of magnetic tape the dots are arranged along the length of a long plastic strip which has been coated with a magnetisable layer audio and video tapes use a similar technology. A magneto optical drive is a kind of optical disc drive capable of writing and rewriting data upon a magneto optical disc. In optical storage technology, a laser beam encodes digital data onto an optical, or laser, disk in the form of tiny pits arranged in concentric tracks on the disks surface. Optical media have a number of advantages over magnetic media such as the floppy disk. Magnetic disks found limited applications in storing the data in large amount. Care and handling of computer magnetic storage media. Optical media refers to discs that are read by a laser. What is the difference between magnetic media and optical. The electromagnetic write head polarizes tiny sections of the hard drive so they face up or down north or.
Magnetic recording, method of preserving sounds, pictures, and data in the form of electrical signals through the selective magnetization of portions of a magnetic material. The information is accessed using one or more readwrite heads. Optical storage overview in this part, you will learn to understand how cddvd stores data identify variations of cd media technology identify variants in dvd media technology install cd and dvd media drives troubleshoot cd and dvd media drives optical storage optical storage is similar to magnetic storage in basic. These dots are created, read and erased using magnetic fields created by very tiny electromagnets. The principle of magnetic recording was first demonstrated by the danish engineer valdemar poulsen in. Cdda specification is base for family of optical storage media. Optical storage, electronic storage medium that uses lowpower laser beams to. Magnetic media are a variety of magnetically coded materials used by computers for data storage. Verbatim has provided digital media solutions to customers for over 40 years. For example, hard drives, cds, dvds, and usb drives are all different types of media.
Because optical media are written to and read with a laser, a bit of data is written to a much smaller area on the optical platter disc than the area that is required to record a bit on a conventional magnetic disk. The key difference between optical storage media, such as cds and dvds, and magnetic storage media, such as hard drives and oldfashioned floppy disks. Magnetic storage media and devices store data in the form of tiny magnetised dots. Csca0101 computing basics 16 storage devices tertiary storage.
Manufacturing and reproducing magnetic and optical media. Multimedia encyclopedias, video games, training programs, and directories are. Magnetic disk media whether you are looking at pure magnetic media, floptical media, or magneto optical drives, all types of magnetic disk media share similar characteristics. In computing and optical disc recording technologies, an optical disc od is a flat, usually. The sample rate used in the magnetic disk is lower than used in the optical disk. Magnetic tape is one of the oldest forms of computer data storage media and it can store vast amounts of data. Using a blue laser allows more data to be placed closer together on a bluray disc, than on a dvd or cd, so bluray has a much higher storage capacity than these older discs. Key differences between magnetic disk and optical disk. This is one of the oldest forms of computer data storage. For dielectric non magnetic media, which we often encounter in optics, with no free charges and currents due to free charges, there is m 0, j 0. Twisted pair is much less expensive than the other commonly used guided transmission media coaxial cable, optical fiber and is easier to work with. Any storage medium that utilizes magnetic patterns to represent information is considered magnetic media.
The optical storage has become the most popular media for multimedia. Learn vocabulary, terms, and more with flashcards, games, and other study tools. The magnetic disk is a fixed storage device whereas optical disk is transportable storage media which is removable. Well learn how optical, magnetic and semiconductor storage works, as well as identify some examples of storage devices. Magnetic media like a hard disk drives are fairly fast so it is suitable for multimedia applications. Magnetic media magnetic media home hard drive tape drive floppy disks networking networking home lan wan internet topologies topologies home bus topology mesh topology ring topology star topology extra. Mallett, deputy secretary economics and statistics administration robert j. Optical platters offer a high degree of stability because they are far less susceptible than magnetic disks to corruption by environmental influences such as electromagnetic fields. Magnetic and optical media manufacturing market research. Menu difference between magnetic and optical storage by aakar november 12, 2007 if you are unable to see the table. The blu part of bluray refers to the fact that the laser used to read the disc uses blue light instead of red light. In 1983, just a year after the introduction of the compact disc, kees schouhamer immink and joseph braat presented the first experiments with erasable magneto optical compact discs during the 73rd aes convention.
For longdistance applications, twisted pair can be used at data rates of 4 mbps or more. Magnetic vs optical media optical media are storage media that hold information in digital form and that are written and read by a laser. Magnetic and optical recording media manufacturing 1997 economic census manufacturing industry series 1997 issued october 1999 ec97m3346c u. Define magnetic media and optical media and list three types of each media. Difference between optical disk and magnetic disk is that an optical disc is a type of optical storage media that consists of a flat, round, portable disc made of metal, plastic, and lacquer. Igcse ict magnetic storage devices media igcse ict.
Optical disc is any storage media that holds content in digital format and is read using a laser assembly is considered optical media. In practice, the effective multimedia presentation capacity is improved with enhanced video data. Optical media such as the compact disk are storage media that hold content in digital form and that are written and read by a laser. Our storage media solutions include external hard drives, usb drives and recordable media dvdr, bluray, cdr etc. Disk media is more expensive per megabyte or gigabyte than tape, usually has a lower capacity, and is more easily used on a filebyfile basis as compared to tape. Difference between magnetic disk and optical disk with. Optical disk generates better signaltonoise ratio as compared to magnetic disk. A strength of optical recording is that, unlike its magnetic counterpart it can support readonly, writeonce and erasable rewritable modes of data storage. Types of storage devices physical components or materials on which data is stored are called storage media. The electromagnetic write head polarizes tiny sections of the hard drive so they face up or down north or south to.
By implementing a hybrid backup solution, organizations can achieve hyperscalability while setting their own pace during their journey to the cloud. These practice sets will be very useful for ssc, cgl, chsl, mts, ias, upsc or other. Contents preface author xvii chapter1 introduction 1 1. Pdf magnetic and optical properties of nanocorrugated co. Intended for use by data processing installation managers, operating personnel, and technical staff, this publication provides a comprehensive set of care and handling guidelines for the physicalchemical preservation of computer magnetic storage media principally computer magnetic tapesand their stored data. Optical storage, electronic storage medium that uses lowpower laser beams to record and retrieve digital binary data. Magnetic storage media, primarily hard disks, are widely used to store computer data as well as audio and video signals. Two main categories of storage technology used today are magnetic storage and optical storage. Blue light has a shorter wavelength than red light used with cds and dvds. The most common types of optical media are bluray bd.
936 532 542 485 1174 104 1468 107 1503 732 1248 57 695 1365 813 963 1342 159 684 1203 1326 118 487 1304 831 100 277 971 1385 1163 1495 1064 643 570 491 572 634 1115