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Explain different types of storage devices

Topic: Explain different types of storage devices in Computer systems Storage Devices Storage devices are used to store data and instructions permanently. Storage devices are also called secondary storage devices / backing storage devices / external storage devices or auxiliary storage devices. Examples of storage devices include Hard Disk, CD and DVD etc. Why Secondary Storage Devices are Used? Secondary storage devices are used because: Primary memory(RAM) is volatile and temporary. When computer is switched off, all data in ram is erased. Storage devices can store large amounts of data and instructions permanently whereas Primary memory has less capacity of storing data. Types Of Storage Devices There are three main types of storage devices:  Magnetic Tape   Magnetic Disk   Optical Disk   Flash Memory storage devices 1. Magnetic Tape Magnetic tape is the oldest storage device. It is made of plastic coated with m...
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Definition and History of ECommerce

What do you mean by E-Commerce? Electronic Commerce (e-Commerce) is a general concept covering any form of business transaction or information exchange executed using information and communication technologies (ICTs). e-Commerce takes place between companies, between companies and their customers, or between companies and public administrations. Electronic Commerce includes electronic trading of goods, services and electronic material. BRIEF HISTORY OF E-COMMERCE + E-commerce started in early 1970’s with invention of electronic fund transfer(EFT). + Only used by large organizations, financial institutions and a few small business at that time. + After invention of EDI (Electronic Data Interchange) from financial institutions to manufacturers retailers, services and so on. + Many other e-commerce applications started from stock trading to travel reservation system. + With commercialization of internet in early 1990’s. The term electronic commerce was used. Interne...
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Who Invented First PC Virus? Pakistanis Invented First PC Virus in 1986

Who Invented The First PC VIRUS-Video Proof by F-Secure two Pakistani bothers, Amjad Farooq Alvi and Basit Farooq Alvi, invented this very first PC Virus Who invented the first PC Virus? First ever PC computer virus was named as Brain. In 1986,   two Pakistani bothers, Amjad Farooq Alvi and Basit Farooq Alvi, invented this very first PC Virus. Amjad farooq Alvi and Basit farooq Alvi  are currently running an ISP under the name of Brain Telecommunication Limited, in Lahore, Pakistan. First PC virus invented by Pakistani brothers amjad and basit Mikko Hypponen travelled to Pakistan to find the writers of the first PC virus. The first virus to infect PC computers was discovered in 1986. Intriguingly, the virus contained the contact details of its authors in Pakistan. 25 years later, in February 2011, Mikko Hypponen, Chief Research Officer at F-Secure, travelled to the city of Lahore in Pakistan to find the authors . The authors were identified as brothers Amjad F...
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