computing devices

computing devices

1. desktop computers

   • desktop computers
     • monitor: monitors display the results of a computer processing to the user. They can display characters as they are typed video as it is played or can be used for watching CCTV images
       • Keyboard: a keyboard has keys that are labelled with characters such as letters, punctuation marks,numbers,and symbols.it can be used to enter commands into a computer or for typing letters, reports , memos , or entering data into spreadsheets or databases
         • hard disk drive (HDD) using magnetic disks: hard disk drives use magnetic disks for storing software and data in files the disks are circular and spin at high speeds while drive heads read and write the data which makes hard disks susceptible to dirt and damage if move suddenly. hard disks can store huge amounts of data. the files can be read , edited , re-written or deleted. hard disks are used for storage of the operating systems , files and data when not in use at the time or when the computer is turned off.
           • DVD drive: optical devices uses optical media such as CDS and DVDS to store software and data In files. blue ray disks are large capacity optical disks and can store very large amounts of data. data stored on CD-ROMs and DVD-ROMS can be read but cannot be altered. the files can be read, edited re written , or deleted only if CD_R/RWs or DVD-R/RWs are used.
           • mouse: a mouse is used to move a pointer on screen and has one or more buttons that are clicked to choose items from an on screen menu and select items by clicking

2. portable devices

   • laptops: laptops are portable because they are lighter than desktop computers and they can be powered by batteries. the keyboard and pointing device are built in stead of separate and the mirror is built in, optical storage devices are usually built in. connection to a network and/or the internet is usually wireless however laptops allow the user to be mobile but easily damaged while being moved and easy to steal. typical uses of laptops by business include: office-based tasks such as word processing and dealing with emails while away from the office and when travelling. laptops are also useful because they are a good use of making documents, editing a video or audio , creating presentations , instant messaging between employers or customers and live web cam chat between employees and/or customers
   • netbooks: netbooks are smaller,lighter than laptops. easier to carry or use while travelling on trains and aircraft, netbooks are portable because they are lighter than laptops, desktop computers , they can be powered by batteries , the keyboard and pointing device are built in instead of separate. also the monitor is built in, storage data can be on a solid state disk or a magnetic hard disk, although they do not usually have built in optical storage devices. they use wireless connections to an network and or the internet netbooks allow the user to be mobile but like laptops are easily damaged while being moved and are easy to steal they usually have a low specification so software applications that need fast processors and a lot of memory run shower or maybe not at all. typical uses of netbooks by businesses include office-based tasks similar to those performed on desktop and laptop computers but the lower specification of netbooks means that tasks the longer and some cannot be done.
   • netbooks: while out the office netbooks are most useful for sending emails and receiving them and instant messaging, live web chat, browsing the internet.
   • tablet computers: tablets have a touch screens that can: display on screen keyboard for typing, allow selection to be done with the fingers on screen, respond to touch gestures such as swiping and pinching, run an application that will take over the whole screen and hole other applications. tablet computers are portable because they are usually smaller than laptops and netbooks, are lighter than them, can be powered by batteries, have no physical keyboard or pointing device, often have a solid state disk or other flash memory for storage of data. most office tasks can be done on tablet computers but users can find this awkward or difficult as the software may work in different ways than on desktops or laptops