Week6 input, output and storage devices

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    17-May-2015

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<ul><li> 1. InputDevicesKeyboard, mouse, scanners,microphones, graphicstablets, digital cameras,touch screens, and joysticks.</li></ul> <p> 2. Keyboard Today, standard keyboards have 104 or105 keys. An electronic circuit inside thekeyboard transmits the code of a pressedkey to the CPU. QWERTY is the most used modern-daykeyboard layout on English-languagecomputers. It takes its name from the first sixletters at the upper left of the keyboard. 3. Keyboard 4. Mouse 5. Touch ScreenTouch Screen is a type of display screenthat has a touch-sensitive transparent panelcovering the screen so that it can recognizethe location of a touch on its surface. 6. Light PenA light pen is a form ofa light-sensitive wandused in conjunctionwith a computersmonitor. It allows theuser to point todisplayed objects ordraw on the screen ina similar way to atouch screen but withgreater positionalaccuracy. 7. Graphics Tablet (Pen Tablet)A tablet is an alternate type of input devicethat can be used in place of a pointingdevice. It enables you to enter drawingsand sketches into a computer. The tabletconsists of two parts, a flat surface fordrawing and a pen or stylus that isprogrammed to work with the tablet. 8. Concept Tablet and ConceptKeyboard Concept tablets and keyboards arewidely used for special purposecomputers when fast input is needed.They are ideally suited for selecting from alimited range of choices, such as takingorders in a fast food restaurant. 9. WebcamA webcam is essentially a small camera that is connectedto a computer, either directly or wirelessly, and gathers aseries of images that are viewed in real time on thecomputer screen or over a network, especially over theInternet. 10. Scanner 11. Microphone 12. Joystick 13. OutputDevices 14. MonitorThere are two main types ofmonitor:Flat panel monitors and cathoderay tube (CRT) monitors.A flat panel monitor uses a liquidcrystal display (LCD) instead of acathode ray tube to displaydata. LCD monitors occupy lessspace, consume less energy, andare much lighter than CRTmonitors. Many monitorcompanies have alreadystopped producing CRT monitors. 15. MonitorA monitor connects to either a VGA (videographics array) or DVI (digital visual interface)port on a video card. Both devices shouldsupport the same type of connection. 16. PrinterDepending on the printing technologies, printersare divided into three main categories: impact,ink-jet, and laser printers. Ink-jets (bubble-jets) printers: Ink-jet printers usetiny jets to spray ink onto the paper. Laser Printers: Laser printers produce high printquality at high speed. They are called laserprinters because they use a laser beam toproduce an image on a drum. Dot matrix printers push a row of pins through anink ribbon onto the paper. Dot matrix printers areused for cheaper, low quality Printing. 17. PrinterA dot-matrix printerA laser printer An Ink-Jet Printer 18. PlotterA plotter is an outputdevice similar to aprinter, but for largerimages. Plotters useeither pens orelectrostatic chargesand special chemicalsto print an image. 19. Speakers and Headphones 20. DataStorageDevices 21. A storage device is a hardware device designed tostore and retrieve information.Types of storage devices There are two types of storage devices:temporary storage devices and permanentstorage devices RAM, CPU caches, and CPU registers aretemporary storage devices. Permanent storage devices hold information untilit is deleted or overwritten. Depending on thetechnology, secondary storage devices can bedivided into three categories: magnetic, optical,and flash storage. 22. Hard Disk Drive (HDD)A hard disk drive (HDD), commonly referredto as a hard drive, hard disk, or fixed diskdrive, is a device that stores digitallyencoded data on rapidly rotating platterswith magnetic surfaces. Hard disks are themain large data storage area inside yourcomputer. Hard disks are used to store yourprograms and data. They are much fasterthan most other types of storage deviceand can also hold much more data. 23. Hard Disk Drive (HDD) 24. FormattingWhen a hard disk is manufactured, theplatters are empty, so your computercannot read them. The process of creatingthe tracks and sectors on the platters andpreparing the disk for use is calledformatting. 25. Hard Disk Drive (HDD) 26. Solid-State Drive (SSD)A solid-state drive is astorage device thatuses solid-statememory to storedata. In contrast withtraditional harddrives, solid-statedrives contain nomoving parts: nospinning platters, nomoving heads. Dataare split into word-lengthpieces andstored in memory. 27. Why SSD?Solid-state drives may be preferred over traditionaldisk drives for a number of reasons: The first advantage is the speed of operation. The second advantage is that breakdown is lesslikely. Because there are no moving parts, lesscan go wrong mechanically and dropping thedrive is less likely to cause damage to the data. 28. Floppy Diskette (FDD)Floppy disks are also called diskettes. Theyare very slow compared to hard disks orCD-ROMs and hold a smaller amount ofdata (1.44 megabytes).Floppy disks are also quite fragile. Floppydiskettes are not used any more andmodern computers do not come withfloppy disk drives. 29. Magnetic TapeComputers can read and write data on specialcartridges of magnetic tape. A magnetic tapecartridge looks like a music cassette. 30. CD-ROMA CD ROM (compact disc-read-only memory) is atype of optical diskcapable of storing largeamounts of data up to 1GB, although the mostcommon size is 700 MB. 31. CD-ROM 32. DVD-ROMIts main uses are videoand data storage. DVDsare of the samedimensions as compactdiscs (CDs) but arecapable of storing muchmore data (about 4.7 or8.5 GB of data on oneside, or 17 GB on a diskwith two sides) 33. Double Layer DVD8.55 GB 34. Flash Disk 35. Portable Hard Drive 36. SD (Secure Digital) Card 37. Blu-ray DiscThe Blu-ray disk is a highdensity optical storagemedium.The format offers morethan five times the storagecapacity of traditionalDVDs and can hold up to25GB on a single-layer discand 50GB on a dual-layerdisc. Recent developmentby Pioneer has pushed thestorage capacity to 500 GBon a single disc by using 20layers. 38. HomeworkPage 90, 100, 101, 102, 103 </p>

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