Secondary Storage Devices COMPUTER Compiled by Belieber9N Class - IX PROJECT Secondary Storage Devices As we all know that the main memory stores the data in a temporary manner which means all the data will be lost when the power goes off. To keep our data safe we use secondary storage devices. These are used for storing the data in a permanent manner so that all the data will remain stored whether the power is switched on or switched off‚ the power will never
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IS022 3/20/2014 Access Methods of Secondary Storage Devices Secondary Storage Device is storage medium which is used to store large amount of data permanently until it is changed by user. Though it stores information‚ it cannot be accessed directly by the CPU. The data stored in Secondary Storage Device can be accessed depending upon how it is stored on the device. Mainly there are two methods of accessing data from the Secondary Storage Device. 1) Sequential Access Method 2) Direct Access
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Optical Storage Devices • An optical disk is a high-capacity storage medium. An optical drive uses reflected light to read data. • To store data‚ the disk’s metal surface is covered with tiny dents (pits) and flat spots (lands)‚ which cause light to be reflected differently. • When an optical drive shines light into a pit‚ the light cannot be reflected back. This represents a bit value of 0 (off). A land reflects light back to its source‚ Representing a bit value of 1 (on)
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Computer Storage Devices Storage devices are used in order to store various items such as programs‚ data and instructions. Storage was used as early as 1804 by hole punching paper cards in order to control machinery. Without storage‚ the computer programs and files that exist now would not be possible. There are many different devices used for storage today such as hard drives‚ floppy drives and CD-Rom drives. Hard drives come in all computers and are the main storage device. An average hard drive
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multiple store theory of memory there are three different storage areas within the brain. Sensory memory is where the five senses are put to use and it has unlimited capacity like iconic and echoic storage and has different storage mechanism. However‚ the duration of sensory memory is very limited. Work bench memory is an area of the brain where information is stored for long-term memory and retrieval. In the same way‚ work bench memory has limited duration but
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F Nanotechnology‚ the science of the extremely tiny as commonly known (one nanometer is one-billionth of metre)‚ is an important emerging industry which is thought to reach a market of one trillion US dollars by 2015. It involves the understanding and control of atoms and molecules to create new materials with a variety of useful functions. It is the understanding and control of matter at the sphere of 1 to 100 nanometers (a sheet of paper is about 100‚000 nanometers thick). Nanotechnology is a
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Storage Functions of secondary storage Secondary storage also called auxiliary storage or backing storage is used to store data and instructions when they are not being processed. Secondary storage is much cheaper than primary storage and is also used to back up for later use. Storage media Storage media are the physical hardware on which a computer keeps data‚ instructions and information. E.g. a CD‚ a DVD‚ a floppy disk‚ hard disk. Storage device Storage devices record and retrieve
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different ways to input the information and it can be done in an automatic fashion‚ as with a computer‚ or it can be done manually‚ as with a human writing the information down. For instance‚ printed questionnaires would best use a special scanning device called an optical data reader that uses optical mark recognition (OMR); when people complete the OMR form using pencils to fill in boxes on OMR paper an optical mark reader (OMR) can convert the pencil marks into digital data. The best method for
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NANOTECHNOLOGY 1. ABSTRACT: Nanotechnology as the name suggests is derived from two words-nano meaning small and technology meaning the science and engineering so it may be defined as the science and engineering at scale of atoms and molecules. Nanotechnology involves materials so small (1 to 100 nanometers in size) that they exhibit unique properties. The goal of nanotechnology research is to understand unique properties of nanosized particles and use that knowledge to create new‚ high performance
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Nanotechnology is the engineering of functional systems at the molecular scale. This covers both current and work and concepts that are more advanced. Nanotechnology is the projected ability to construct items from the bottom up‚ using techniques and tools being developed to make complete‚ high performance products. Basically‚ nanotechnology is a field of research concerned with building things (materials and devices). What it does: increases efficiency of energy consumption‚ helps clean the environment
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