Audio cassettes video cassettes tape floppy disk hard disk drive magnetic core memory optical storage devices. Compact disk, dvd, hddvd, bluray holographic data storage system hdss laser turntable bo. The optical portion of the name comes from the fact that optical tracking is used in the positioning of the head, enabling a much higher track density and total storage. Pdf magnetooptical devices for optical integrated circuits. Apr 07, 2016 magnetic storage, such as digital dataaudio tapes or the old floppy disks remember those. The information is accessed using one or more readwrite heads. Cds are circular disks that use optical rays, usually lasers, to read and write data. Magneto optical devices for optical integrated circuits. Categorizing storage devices magnetic storage devices optical storage devices. Magnetic and optical data storage devices rely on individual bits being stored as distinct magnetic or optical changes on the surface of the recording medium.
It is similar to a magnetic diskette except for its larger size. If the beam hits a dot it is reflected back differently to how it would be if there were no dot. An introduction summary magnetic storage is slowly replacing optical disks for digital archives. Magnetic storage uses different patterns of magnetisation in a magnetisable material to store data and is a form of nonvolatile memory.
Basics of computers secondary memory tutorialspoint. The data on the storage medium is read by bouncing the laser beam off the surface. Highcapacity removable storage devices provide the capability to easily transport huge data files. Give two uses of optical discs and for each use give a reason why they are preferred to magnetic. In general, its faster and easier to write data to magnetic storage. A magneto optical disk is a rewritable disk that makes use of both magnetic disk and optical technologies. It can store anywhere from 160 gigabytes to 2 terabytes. 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. The magnetic and optical disk comes under the category of secondary storage devices. Several industries use optical devices which supports a. Optical discs and magnetic tapes are both used to store computer data. A magnetic reader arm is used to read data from and write data to the disks. Pierre bijaoui, juergen hasslauer, in designing storage for exchange 2007 sp1, 2008.
Key differences between magnetic tape and magnetic disk. Optical storage devices use lasers to read the reflections in the disk or burn the data pattern into the disks. Categorizing storage devices magnetic storage devices optical storage devices powerpoint presentation. Well learn how optical, magnetic and semiconductor storage works, as well as identify some examples of storage devices. Secondary storage devices two major types of secondary storage devices. The magnetic disk and optical disk are the storage devices that provide a way to store data for a long duration. Types of storage devices physical components or materials on which data is stored are called storage media. Mar 07, 2020 an optical disk has the capacity of storing much more data as compared to other devices and that originates from the fact that with the help of laser beams, people can have more controlled and focused system. General presentation on the most common storage devices and other functions. Optical storage technologies storage networking industry. 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. These dots are created, read and erased using magnetic fields created by very tiny electromagnets. The data is read from or written to the storage medium by a piece of hardware known as a drive or a storage device. Computer memory is broadly divided into two groups and they are.
Storage devices other example of storage devices raid raid is short for redundant array of independent or inexpensive disks. Storage media vs storage drives information stored on backing store is placed on a storage medium. At that time, data were stored on tapes, and tapes were sequentially accessed. Optical discs and drives optical disc characteristics a type of storage read from and written to using laser beams todays standard for software delivery divided into sectors like magnetic discs but use. What are some examples of magnetic and optical storage. Also explore the seminar topics paper on 3d optical data storage with abstract or synopsis, documentation on advantages and disadvantages, base paper presentation slides for ieee final year computer science engineering or cse students for the year 2015 2016.
Compact disk, dvd, hddvd, bluray holographic data storage. A snapshot of a threedimensional dendrite in pure ni with a cubic interfacial energy anisotropy obtained from a phasefield simulation with thermal noises 72 courtesy. May 04, 2018 aqa specification reference as level 3. Optical storage provides greater memory capacity than magnetic storage because laser beams can be controlled and focused much more precisely than can tiny magnetic heads, thereby enabling the condensation of data into a much smaller space. Aqa alevel magnetic, optical and flash storage youtube. Table of contents technology basics optical disk jukeboxes libraries. When cavemen started making scratches on the walls of their caves, we have not only an application of writeonce readymany worm technology, but a data encoding method as well. The physical material that actually holds data is called a storage. Aug 02, 2018 the magnetic disk and optical disk are the storage devices provides a way to store data for a long duration. Tribology and mechanics of magnetic storage devices by bharat bhushan. So dear reader i have provided top expected gk questions from input and output device of computer. Storage devices free download as powerpoint presentation.
Explore 3d optical data storage with free download of seminar report and ppt in pdf and doc format. Presentation overview storage basic units of data storage data access methods magnetic disks hard disk floppy disk or diskette zip disk super disk optical disk cd dvd bluray disk flash memory storage solid state drives usb flash drives memory cards. Storage devices computer data storage usb flash drive. Draw four lines to match each storage medium to the most appropriate use in this list. A magneto optical drive is a kind of optical disc drive capable of writing and rewriting data upon a magneto optical disc. Capacity, performance and price of optical storage devices are continually improving. A floppy disk is so called because it consists of a flexible sheet of plastic, coated with iron oxide a magnetizable material. Memory is an internal storage area in a computer, which is availed to store data and programs either permanently or temporarily. The disk platter is coated on both the surfaces with magnetic material and both the surfaces can be used for storage.
Mcq input and output device of computer with answers pdf. Optical storage devices save data as patterns of dots that can be read using light. This report covers the gamut of current and emerging magnetic and optical storage media, including magnetic recording tapes, hard disk media and recording heads, optical disks and emerging storage technologies, including new optical disk formats, holographic recording, nearfield recording, as well as the materials required to produce these media and devices. Difference between magnetic tape and magnetic disk with. Nov 27, 2018 input output device based mcq mcqs on input and output devices gk objective question answer exam question answer for competitive exam of govt jobs. Both are categorized under the category of secondary storage devices. Jul 03, 2017 download computer memory ppt pdf presentation. Plasmon laser magnetic storage lms used the ablative approach in its infinity 6000, as does ibm in its true writeonce optical disk drives, which are made by sony.
Optical storage devices and their impact on libraries and information retrieval systems introduction optical storage devices represent some of the most viable innovations for the improvement of the costperformance relationships in computer and information management fields. Research emphasis on extremely long term data preservation 5 all optical based technologies 50 100 yr. Csca0101 computing basics 16 storage devices tertiary storage magnetic tape a magnetically coated strip of plastic on which. Sep 25, 2017 explaining and evaluating optical, magnetic, solid state and cloud storage. Archive owners must understand the changing roles that optical and magnetic technologies are playing and will play in the future. A floppy disk drive spins at 360 revolutions per minute rpm, so its relatively slow. Storage devices secondary storage hard disk the hard disk drive is the main, and usually largest, data storage device in a computer. Light is used to aid the device in reading the data that stored. Data is stored in form of tracks, spots and sectors. On the other hands, the magnetic disk is used as a secondary storage in modern computers the magnetic. Disadvantages huge storage capacity compared to fixed and portable hard drives.
Optical disks after the human memory, optical storage is perhaps the oldest storage technology in use. Magneto optical disks are seldom manufactured and used due to the advent of flash drives and dvdcd drives, which are less expensive and have better. In this lesson, students can learn about the following. Magnetic storage and retrieval devices include tape, flexible disk, and rigid disk drives used for audio, video, and data processing applications. In computing, mass storage refers to the storage of large amounts of data in a persisting and machinereadable fashion. Optical disk is again a storage device and use optical storage technology for data processing like readwriteaccess operations. Ccoommppuutter er ffununddaammenenttaallss pprradadeeeepp kk. The magnetic recording process involves relative motion between a magnetic medium tape or disk and a stationary or rotating readwrite magnetic head. Typically, data is written to optical media, such as cd s and dvds. Magnetic storage or magnetic recording is the storage of data on a magnetized medium. Optical media can have a shelf life greater than 50 years.
Avaliable format in pdf, epub, mobi, kindle, ebook and audiobook. Categorizing storage devices storage devices hold data, even when the computer is turned off. Magnetic storage devices store data by magnetizing particles on a disk or tape. Direct access storage devices dasds magnetic discs hard disks high capacity, low cost, fast floppy disks low capacity, lower cost, slow optical disks cdrom compact disc, readonly memory 3.
Raid disk drives are used frequently on servers but arent generally necessary for personal. The need to devise these devices has emerged because the previous semiconductor storage devices have very limited capabilities, for example, the cost of storing the information in such devices is very high. The evolution of these magnetic storagedevices isagoodlessoninmature technology. The information is accessed using one or more readwrite heads magnetic storage.
Optical storage is any storage method in which data is written and read with a laser for archival or backup purposes. This function allows more data storage in the same space. A robust molecular platform for nonvolatile memory devices. About ten years ago it was becoming evident that optical. Learn more about this topic in the related lesson called external and internal storage devices. Find materials for this course in the pages linked along the left. A writeonce disk reflectivity differs between the original surface of an optical. Igcse ict magnetic storage devices media igcse ict.
The diagrammatic representation of the classification of. Optical storage devices range from cdroms which was established in 1982 to flash drives which were introduced in 1999. Data gets accessed and stored at a faster speed with the help of laser beams whereas it takes more time to copy the information on a magnetic disk. The redox pair also demonstrates unequivocally different magnetic and optical. National security agency central security service revised. Lets explore the capacity of internal and external storage devices. Computer systems began with magnetic storage in the form of. In this post i have updated some important questions with their answer as a mcq format or quiz format for your upcoming competitive examinations. Types of storage devices lesson 9 powerpoint presentation.
Magnetic storage devices magnetic tapes access type. We want to ensure these videos are always appropriate to use in the classroom. Optical storage devices include compact disks cds, digital versatile disks dvds, and bluray disks bds. There are three main categories of storage devices.
Now a day computer is one of the most important field for every examinations. Troubleshoot cd and dvd media drives optical storage optical storage is similar to magnetic storage in basic operation but reads and records using light instead of magnetism. Examples of magnetic disks are hard disk, floppy disks, magnetic tapes etc. An entire set of encyclopedias, for example, can be stored on a standard 12centimetre 4. Difference between magnetic disk and optical disk geeksforgeeks. Optical storage devices offer advantages over other highcapacity storage such as microfilm and tape in that they have faster access times. Magnetic storage is widely used because it is relatively cheap in comparison with other storage technologies. 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. Mounted on streaming devices, the magnetic tapes used to be the mass storage media for the computer in the 1970s.
Guidance for the sanitization and release of is storage devices not covered by this document may be obtained by submitting all pertinent information to nsacss attention. These practice sets will be very useful for ssc, cgl, chsl, mts, ias, upsc or other. They are very cheap as you can get 700 mb of storage. Magnetic storage is readwrite, which makes it possible to reuse the storage capacity. Hardware components that readwrite to storage media are called storage devices. Difference between magnetic disk and optical disk with. A magnetic disk have circular platters coated with magnetic material. Devices andor systems that have been described as mass storage include tape libraries, raid systems, and a variety of computer drives such as hard disk drives, magnetic tape drives, magneto optical disc drives, optical. Magnetic storage devices use readwrite heads, electromagnets that detect read or change write the magnetisation patterns on the disk. For magnetic devices, the data that gets stored is up to several hundred gigabytes. Magnetic storage has followed a linear and predictable development of continual improvement from the early 1960s but is rapidly approaching the point where physici limitations restrict increased capacities. The magnetic tapes are used for backups and the storage of the data that may be less frequently used. Tribology and mechanics of magnetic storage devices. It is a category of disk drives that employ two or more drives in combination for fault tolerance and performance.
Magnetic storage media and devices store data in the form of tiny magnetised dots. Read or download tribology and mechanics of magnetic storage devices book by bharat bhushan. Magnetic storage, such as digital dataaudio tapes or the old floppy disks remember those. Two main categories of storage technology used today are magnetic storage and optical storage.
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