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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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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avoid getting a virus on a computer? – Run anti-virus and anti-spyware on a PC‚ Get a MAC and DO NOT open any email from unknown sources. 12. According to the notes and lecture‚ what is the most secure and efficient way to back-up data? –a storage device. 13. Per the notes---- Briefly‚ explain how a computer at SMCC‚ which in a
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Input Devices Light sensor: Gesture detection – the detection of human movements – may be used to enable advanced‚ differentiated smart features in portable electronics such as smart phones. Many of these features save energy by enabling electronics to expend the minimum amount of energy necessary to provide appropriate screen illumination levels. For example‚ when a phone is held to a user’s ear during normal conversation‚ the user can not see the screen‚ and therefore it may be turned off. This
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the Device The selected oscilloscope for this project is the GW-Instek (Model GDS-3152) Digital Storage Oscilloscope with a sampling rate of 150 MHz‚ as shown in Figure 38. Figure 38. GW-Instek oscilloscope The oscilloscope has a function to save the screenshots of the plots‚ as well as the 48 sampling data in the form of Excel file‚ which can be used for further analysis. The oscilloscope can also be linked directly to the computer for ease of data retrieval. This is a digital storage oscilloscope
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Devices Types of Electronic Communication As technology becomes more advanced and affordable‚ we are often presented with new ways to perform old tasks. Many of these advances improve the ways we communicate with others‚ allowing us to stay better informed and better connected. As these devices evolve‚ our communication methods will continue to evolve with them. Types of Modern Communications Devices When cartoonist Chester Gould gave comic strip detective Dick Tracy a two-way wrist radio‚ he
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Analytical Ability and Knowledge * Analyses and Compare the Physical Storage Structures and types of available INDEX of the latest versions of: 1. Oracle 2. SQL Server 3. DB2 4. MySQL 5. Teradata First of all define comparative framework. Recommend one product for organizations of around 2000-4000 employees with sound reasoning based on Physical Storage Structures Introduction to Physical Storage Structures One characteristic of an RDBMS is the independence of logical
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