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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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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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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DEFINATION OF LIBRARY: A library is said to be a room or building where collections for books‚ records‚ and films for borrowing or research to a public or student for reference are kept for use. According to Aina a library is concerned with the collection‚ processing‚ storage‚ and dissemination of recorded information for the purpose of reading‚ studying and consultation. CATALOGUE: Catalogue is a principal guide or key that leads directly from catalogue card to the book on the
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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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modal‚ charge a service fee based on the volume and value of transaction offered for example‚ what you pay when you buy or sell a house would be transaction fees.amazon .com Subscription fees model‚ customer pay a fixed amount‚ usually monthly to get a type of service. For example‚ a customer acess fee to America online Advertising fees modal‚ companies charge other to place a banner on their sites. For example google.com Electronic retailing‚ retailing conducted online‚ over the internet such
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using the same word‚ but in reality‚ they are defining the concept differently. Definitions are important not just when learning vocabulary‚ but also when you are talking about something and using it as a point of reference. Think about some of the example we discussed in class: hero‚ love‚ life‚ wealth‚ happiness. When writing (and speaking too)‚ you want be as clear and detailed as possible about what you’re talking about‚ and one way to do that is to define the term/ concept. Define what you’re going
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