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
Premium Floppy disk USB flash drive Blu-ray Disc
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
Premium Computer data storage Computer storage
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)
Premium
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
Premium USB flash drive Floppy disk Computer data storage
captured in order to be processed. There are many methods to input data and each situation warrants a different method. There can be several 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
Premium Computer Computer data storage Personal computer
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
Premium Personal computer
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
Premium Personal digital assistant Mobile phone Blu-ray Disc
Unit 1 Assignment 1: Voice vs. Data Cell phones: A mobile phone (also known as a cellular phone‚ cell phone‚ and a hand phone) is a device that can make and receive telephone calls over a radio link while moving around a wide geographic area. It does so by connecting to a cellular network provided by a mobile phone operator‚ allowing access to the public telephone network. By contrast‚ a cordless telephone is used only within the short range of a single‚ private base station. In addition to telephony
Premium Mobile phone Telephone Text messaging
Different Types Of Software. SOFTWARE It is a collection of computer programs and related data that provide an instruction to the computer and tell computer that what to do. There are three types of software. 1. System software 2. Application software 3. Programming software. System software System software is a computer software that is designed to operate the computer hardware‚ to provides the basic functionality and also used for
Premium Computer Computer software Computer program
to grind many kinds of mine and other materials‚ or to select the mine. It is widely used in building material‚ chemical industry‚ etc. There are two ways of grinding: the dry way and the wet way. It can be divided into tabular type and flowing type according to different expelling mine. 1.Grate Ball Mill There is a discharging grate plate installed at the discharging end‚ in the inner surface of the hollow shaft liner equipped with anti-spiral blades‚ it can overflow the ore pulp out of the
Premium