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by: Miss Emery VonRueden


Miss Emery VonRueden
GPA 3.55

Barbara Guillott

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About this Document

Barbara Guillott
Class Notes
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This 101 page Class Notes was uploaded by Miss Emery VonRueden on Tuesday October 13, 2015. The Class Notes belongs to CSC 1100 at Louisiana State University taught by Barbara Guillott in Fall. Since its upload, it has received 11 views. For similar materials see /class/222864/csc-1100-louisiana-state-university in ComputerScienence at Louisiana State University.




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Date Created: 10/13/15
Discovering Computers 2010 Chapter 6 Output Chapter 6 Objectives What is Output What isoutput gt Data that has been processed into a useful form I Output device is any hardware component that can convey infonnation to one or more people p 300 301 Fig 61 Display Devices What is adisplay device gt Output device that Visually conveys text graphics and Video information I Information on display device sometimes called soft copy gt Monito rhouses display device that is packaged as separate peripheral p302 Display Devices What is an LCD monitor gt Uses liquid crystal display gt Has a small footprint gt Mobile devices that contain LCD displays include gt Notebook computer Tablet PC ultra personal computer portable media player smart phone and PDA p302 303 Fig 62 Display Devices What are some mobile devices that have LCD screens notebook computer portable media player UltraMobile PC Click to viewWeb Link click Chapter 6 Click Web Link from Ie navigation then click Widescreen LCD Monitors below Chapter 6 p303 304 Fig 64 Display Devices What isresolution gt Number of horizontal and vertical pixels in a display device gt Sharpness and clarity of image gt Higher resolution makes image sharper displays more text on screen makes some elements smaller p 304 305 Fig 65 Display Devices What is aplasma monitor gt Displays image by applying voltage to layer ofga s I Larger screen size and richer colors than LCMbut are mOre expensive p 307 Fig 68 Display Devices What is 39i39 3 if andg Uses digital signals to produce crisper higherquality output on LCD and plasma televisions p308 Display Devices What is a If quot quotquot 7 gt Containscathode ray tube CRT gt Screen coated with tiny dots of phosphor material 39 Each dot consists of a red blue and green phosphor gt Common sizes are 15 17 19 21 and 22 inches 39 V1ewable size is diagonal measurement of actual Viewing area p 309 Fig 610 Display Devices What is theENERGY STAR program gt Encourages manufacturers to create energy ef cient devices that require little power When not in use gt Monitors and devices meeting guidelines display ENERGY STAR label p309 Printers What is aprinter gt Output device that produces text and portrait graphics on a physical medium gt Result ishard copy orprintout gt TWO orientationszportraitandlfg1n dscape ndscape p310 Fig 611 Printers How do you know which printer to buy gt Depends on printing needs m budge Paper types and sizes 7 7 7 7 WireJ39 s r39nwre needs rnpnmli ry p310 Printers What is theresolutionof a printer gt Sharpness and clarity gt Measured by number ofdots per inch dpiprinter can output cut u u I U U I I U I I It39sIUIOIIUI COCCCICOOUCUCIIOOIIiCiDIi IIIIIOIIIIIIII OOIIIIIIII DIIIIIOICIOIIIIICCIOOIOI p313 Fig 615 Speakers Headphones and Earphones What is anaudio output device gt Computer component that produces music speech or other sounds gt Speakers and headsets are common devices Click to View Web Link click Chapter 6 Click Web Link from left navigation then click Wireless Music System below Chapter 6 p 320 321 Figs 626 628 Other Output Devices What is afacsimile fax machine gt Device that transmits and receives documents over telephone lines gt Converts an original document into a digitized image gt Many computers include fax capability p322 Fig 630 Other Output Devices What is afax modem gt Modem that allows you to send and feceiye39EIeLd lionifc documents as faxes Click to View Web Link click Chapter 6 Click Web Link from le navigation then click Fax Modems below Chapter 6 p 322 Fig 629 Other Output Devices What is amultifunction peripheral gt Provides functionality of printer scanner copy machine and fax machine p323 Fig 630 Other Output Devices What is adata projector gt Device that takes text and images from computer screen and projects them onto larger screen gt DLP projector gt LCD projector 39 i N data projector Click to View Web Link click Chapter 6 Click Web Link from left navigation then click LCD Projectors below Chapter 6 p323 Fig 631 Other Output Devices What is aninteractive whiteboard gt Touchsensitive device that displays the image on a connected computer screen gt SMART board Click to View Web Link click Chapter 6 Click Web Link from Ie navigation then click S ART Board below Chapter 6 p 324 Fig 632 Output Devices for Physically Challenged Users What is theMagni er gt Windows Magni er enlarges text and other items on screen p 326 Fig 635 Summary of Output Chapter 6rC39omp1ete Discovering Computers 2009 Chapter 4 The Components of the System Unit Chapter 4 Objectives 39 a 39 all l bland other ports mi 1 The System Unit What is thesystem unit gt Case that contains electronic components of the computer used to process data 39 Sometimes called thechassis p 184 Fig 41 The System Unit What are common components insidevit hevsgySTt m gt Processor gt Memory gt Adaptercards 39 Sound card 39 Video card gt Drivebays gt Powersupply lhtel 0325 Wang25 A p 185 Fig 4 2 The System Unit What is themotherboard gt Main circuit board of the system unit gt Contains expansion slots processor chips and memory slots gt Also calledSystem 39 board u 3L kk hliiquotrvieampt k kwebLink from Ie navigatlon then click Motherboards below r p 186 Fig 43 The System Unit What is achip gt Small piece of semiconducting material on which integrated circuits are etched I Integrated circuits contain many microscopic pathways capable of carrying electrical current i H gt Chips are packaged so that they can be attached to a circuit board p 186 Processor What is thecentral processing unit CPU gtInterprets and carries Processor out basrc mstructlons imm g that operate a computer Em wajg m I Control unit directs and Instructions COOIdIIIatCS operatlons 111 Data Computer Information Arithmetic logic unit pCIfOHIlS Memorv Information aIithmetic comparison and logical operations Output Devices Instructions gtAlso called theprocessor Data Informat39on Storage Devices p 186 187 Fig 4 4 Processor What are multicore processors gt A multicore processor is a chip with two or more separate processors gt A dualcore processor is a single chip that contains two separate processors gt A quadcore processor is a single chip that contains four separate processors gt Each processor on a multi core chip generally runs at a slower clock speed but increases overall performance Click to View Web Link click Chapter 4 Click Web Link from le navigation then click QuadCore Processors below Chapter4 p 187 Processor What is amachine cycle gt Four operations of the CPU comprise a machine cycle Step 1 Fetch L Obtain program instruction or data item from memory Memory Step 2 Step 4 Store Decode Write result to memory Translate instruction into Processor r commands l Step 3 Execute Carry out command p 188 Fig 45 Processor What ispipelining gt Processor begins fetching second instruction before completing machine cycle for rst instruction gt Results in faster processing PROCESSOR comm ARIIHMHIC UNIT LOGIC UN I Insu ncuuns data llllol mallon 7 7 39 4 INPUT nunu1 DEVICES a l MEMW DEVICES msu umiuus data 39Intarmallon mania 39 STDHAGE DEVICES p189 Fig 4396 i Processor What is aregister gt Temporary highspeed storage area that holds data and instructions Stores location from where instruction was fetched Stores Stores data instruction while it is While ALU being decoded computes it Stores results of calculation p 189 Processor What iS thequot 39 39 V i L gt Controls timing of all computer operations gt Generates regular electronic pulses or ticks that set operating pace of components of system unit Arvm F7 quotex x xquot x xquot rm a j ng mm x 1 919m x quotx mm 39 Mmmwwamw we L u mWB FQLWW a r I m lt l 1 mm It Emmi2mm ls rsa m mwmor y 39m r f x f aria may I A T yf K J lt p 189190 Processor What are the guidelines for selecting a processor GUIDELINES FOR SELECTING AN INTEL DB INTELCOMPATIBLE PROCESSOR 39 Power users with workstations 39 Lowend servers on a networ r 753 wee 39 Power users or users who design professional drawings produce and edil Core 2 Quad Core 2 Duo videos record and edit music participate in video con erences urea e V 7 professional Web SIIES ola g p i llliEl39iSlVB multrplayer lnternet games rs Ign pro esslonal documenl on r r grapm u s a W newsletters or umbervintenslve sprea she I prod ltl III PZDra presentations use e Web as an intensive research I and ra hlcsvathe Web watch videos ta ra hieintensive ames on 9 p p H p g AthlanMFX CD or DVD create personal Web sites word processing and spreadsheel sollware edit photos communicate with others on the ab via emarl chat rooms and discussions shop eb create basic Web pages use lhe computer as a digital entertainment unit documents with Word processing and spreadsheet software edit photos make greeting cards and calendars use educational or entertainment CD5 communicate wrth others on the Web via email chat rooms and discussions Users with mobile computers or mobile cum 2 Ema Turin 54 devices p 192 Fig 4 8 Processor What areheat sinks heat pipes and liquid cooling gt Heat sink component with ns that cools processor gt Heat pipe smaller device for notebook computers gt Liquid cooling uses a continuous ow of uids to transfer heat away heat sink fan p 193 Fig 4 9 Processor What isparallel processing gt Using multiple processors simultaneously to execute a program faster gt Requires special software to divide problem and bring results together Control Processor Processor 1 Processor 2 Processor 3 Processor 4 I 1Zempry I BI em ory I hiemory l Blemory resultscoinbin39ed p 194 Fig 410 Data Representation How do computers represent data gt Most computers aredigital BINARY DIGIT ELECTRONIC ELECTRONIC 39 Recognize only 1W0 BID CHARGE STATE discretesiateg on eroff I Use a binary system t0 9 recognize two States I UseNumbLeg r system two unique digits 0 and 1 called bits slim for binary digits a p 194 195 Fig 4 11 Data Representation What is abyte gt Eight bits grouped together as a unit gt Provides enough different combinatiomsqof to represent 256 individual character s p 195 Fig 412 88 BVTE FOR THE NUMBER 4 Numbers Uppercase and lowercase letters Punctuation marks Other Data Representation What are three popular coding systems to represent data gt ASCII AmericanStandardC0deforInformationInterehange gt EBCDIC ExtendedBinaryCoded DecimalInterchangeCOde gt Unicode coding scheme capable of representing all world s languages l 1 1 00110010 2 11110010 00110011 8 11110011 p 195 Fig 413 Data Representation How is a letter converted to binary form and back Step 1 The user presses the capital letter T SHIFTT key on the keyboard Step 2 Ah electronic TSignal forthe capitaliletter T is sentvtoithe system uhit Step 3 Step 4 I I The systemrunit converts the After PTOCCSSIHgt the blnarz scan codefor thecapital letteLT code for the cap1tal letter 1 1s to jtSAsQH binary c39dde cgnvened to an image and 0101 0100a39nd stores irm d1splayed on the output dev1ce memory far processing p 196 Fig 414 Memory What ismemory gt Electronic components that store instructions data and results gt Consists of one or more chips on motherboard or other circuit board gt Each byte stored in unique location called anaddress similar to seats in a concert hall p 197 Fig 4 15 Memory How is memory measured gt By number of bytes available for storage Megabyte 1 r n 13 Gigabyte GB 1 billion bytes Terabyte TB 1 trillion bytes p 197 Fig 4 16 Memory What israndom access memory 7 1 Also called main memory or primary storage f Jagger 1 respond Click to View Web Link click Chapter 4 Click Web Link from Ie navig on then click RAM below Chapter p 198199 Memory How do program instructions transfer in and ou tzof Step 1When you39Startth e computer certain Operating system ihinstructions operating 5 e loadedinto RAM from 9 eb browser 39 instructions item les the hard disk rThefop erating system displays the 9 aint program if 39 instructions RAM Operating system interface useri11terfaceon the screen Step ZiWhen39yOufs tart a39 Web Ibrov39V ser the 1 39 139 M 393 AM from b browser windowis Veb browser window A hard disk Iherpa iilt program along with w A Web BroWser39and certain operating System instructions arerin RAM T epaintprogram windbw39 displayed 0n th ei scfeg Paint program window RAM 4Whenyou g1itaaprogram such as the Web browser its program instructionsmre removed from RAM The Web browserrisyno longer displayedcm the screen W39eb browser window is no longer displayed on Veb browser program instructions are removed from RAth p 198 Fig 417 desktop Memory Videoi The Leopard With a Time Machine CLICK TO START Memory What are two basic types of RAM chips Must be reenel gized constantly Do not have to be reenel gized as often as DRAM Faster and more reliable than DRAM chips Newer Type Magnetoresistive RAM MRAM p 199 Memory Where does memory reside gt Resides on small circuit board calledmemory module gt Memory slotson motherboard hold memory modules p 199 Fig 4 18 Memory How much RAM does an application require gt Depends on the types of software you plan to use gt For optimal performance you need more than minimum speci cations p 199 Memory How much RAM do you need gt Depends on type of applications you lint enfdJ to run on your computer RAM 1 GB or less Use Home and business users managing personal finances Using standard application software such as word processing Using educational or entertainment CDs Communicating with others on the Web p 200 Fig 419 1GB to4GB 4GB and up Users requiring more advanced Power users creating V 4 r anahilitie I I Web sites Running sophisticated CAD 3D design or other graphicsintensive Running numberintensive accounting financial or spreadsheet programs software Using voice recognition Working with Videos music and digital imaging Creating Web sites Participating in Video conferences Playing Internet games Memory What iscache gt Helps speed computer processes by storing frequently used instructions and data gt Also calledmemory cache I L1 mne pmmnmssnr u r i 7 7 7 I t2 nacho 7m bi Mam PROCESSOR CHIP Click to View Web Link click Chapter 4 Click Web Link from Ie navigation then click Windows ReadyBoost below Chapter 4 p 201 Fig 4 20 L1 cache built into processor L2 cache slowerbuthas larger capacity L2 advanced transfer39cache is faster built directly on processor chip L3 cache is separate from priocefSSO r chip on motheirjbOard L3 is only on computersithatuse L2 advanced transfer cache Memory What 5 1 391 Jug when rumpur a quot5 Upggt r 1 W 1111mm rm2mm 39 7 am 119 P201202 Memory What is ash memory gt Nonvolatile memory that can be erased electronically and rewritten gt Used With many mobile devices Step 1 Purchase and download music tracks from a Web site With one end of a special cable connected to the system unit connect the other end to the USB port in the portable as memory chips media player 3 USB port 5 7 Click to viewWeb Link Step 2 a CliCk Chapter 4 Ci0k WBb Link Instruct the computer to copy the music tracks to MP3 Pla er from le naVlQatlonr the ash memory chip in the portable media la er y then click Flash Memory below Chapter 4 p 202 Fig 421 Memory What isCMOS Complementary Used in some etal xide RAM chip39s flash semiconductor memory Chips and memory other types of memory chips Uses battery Stores date power to retain time and information when computer s other power is startup turned off information p203 Memory What isaccess time gt Amount of time it takes processor to read data from memory gt Measured in nanoseconds us one billionth of a second gt It takes 110 of a second to blink your eye a computer can perform up to 10 million operations in same amount of time EQOH 16 m1 10H r Nanosecond Onebillionth of a second Picosecond Onetrillionth of a Second Q a S COD p203 Figs 422 423 Expansion Slots and Adapter Cards What is anadapter card gt Enhances system unit or provides connectionsto external devices calledperipherals gt Also called anexpansion card TYPES OF ADAPTER GAHDS Disk controller Connects disk drives television lines Click to View Web Link click Chapter 4 Click Web Link from Ie navigation then click Video Cards 3 camera below Chapter 4 p 204 Fig 4 24 Expansion Slots and Adapter Cards What is an j 2 gt An opening or socket on the motherboard that can hold an adapter card gt Withlbig if the computer automatically con gures cards and other devices as you install them p 204 205 Fig 4 25 Expansion Slots and Adapter Cards What arellash memory cards PC cards andsExpressC ard modules gt AnExpressCard module adds memory storage sound faxmodem communications and other capabilities to notebook computers gt Aflash memory cardallows users to transfer data from mobile devices to desktop computers gt USB Flash drive i An PC card adds various capabilities to computers Click to View Web Link click Chapter 4 Click Web Link from Ie navigation then click ExpressCard Modules below Cha ter 4 p 205 lg 426 427 Ports and Connectors What areportsandconnectors gt Portconnects external devices to system unit gt Connector joins cable to peripheral I Available in one of two genders male and female lleylmard pun mnllse pan prinlzr purl parallel Don composlle when m pnn rM reception pan mm lr Duns I mlcrophona hmdphnnes audluquotl purl pan or jack yon mlsmp39lnm manna lelephnne slim mbleTV non um linelnmm purl pon p 206 Fig 4 28 Ports and Connectors PORT TYPES What are different types of connectors Audln In Cihla TV Humpills mm In mnllnl m n lnlu auu IWI nSATA mm 4 HDMI pun Hummus Keylmll p 207 Fig 4 29 Ports and Connectors Y seuzll llallsrmssiml 0f Jz a What IS aserlal port vmm 3I1100110001 gt Transmlts one blt of data at a by 39 n r i if39a f ga 339 time gt Connects slowspeed devices gigggfgigggm r such as mouse keyboard quot modem quot regs e 3 p 207 Fig 430 Ports and Connectors What is aparallel port gt Connects devices that can transfer more than one bit 2 a time such as a printer p 208 Fig 4 31 Ports and Connectors What areUSB ports USB universal serial bus port can connect up to 127 different peripherals together with a single connector type PCs typically have siX to eight USB ports on front or back of the system unit Single USB port can be used to attach multiple peripherals in a daisy chain USB 20 p208 Ports and Connectors What areFireWire ports gt Connects multiple types of devices that require faster data transmission speeds gt Allows you to connect up to 63 devices together FireWire 800 is the latest FireWire version gt A FireWire hub is a device that plugs in a FireWire port on the system unit and contains multiple FireWire ports in which you plug cables from FireWire devices V p 208 209 Ports and Connectors What arespecial purpose ports gt Allow users to attach specialized peripherals or transmit data to wireless devices I MIDI Musical TRADITIDNAL PORTS Instrument Digital Interface port I eSATA port I SCSI port I IrDA Infrared Data Association port 39 I Bluetooth port Click to View Web Link click Chapter 4 Click Web Link from Ie navigation then click MIDI Ports below Chapter 4 p 209 210 Fig 432 NEWER PORTS Buses What is abus gt Channel that allows devices inside computer to communicate with each other 39 System bus connects processor 7 39 Bus width determines number of bits transmitted at one time 39 Word size is the number of bits processor can interpret and execute at a given time inTeD are quot2 QUad p211 212 Fig 435 Buses What is anexpansion bus gt Allows processor to communicate with peripherals PCI Express Bus PC Card p212 Bays What is abay gt Opening inside system unit used to install additional equipment gt Drive baystypically hold disk drives p 212 Fig 4 36 card readers Power Supply What is a power supply Converts AC Power into J Power tiesr l External peripherals might use an which is an external power supply p213 Mobile Computers and Devices What is amobile computer gt Notebook weighing between 25 and 10 pounds or mobile device quot sman uhune gamble 39 39 mi m player lash memory 2 p213214 Fig4 37 Mobile Computers and Devices What ports are on a notebook computer microphone port or jack DVIV port headphones pod or jack network port f telephone line FireWire pen in port p 214 Fig 4 38 Mobile Computers and Devices What ports and slots are on a tablet PC p 214 Fig 439 WUSE ports lt video port lg modem and network ports M behind cover smart W FireWire port card slot headphones port IrDA pod PC Card s ot microphune port Putting It All Together What are suggested processor and RA fon fgyf based on the needs of various types of users 1 Intel Core 2 Extreme or AMD Turinquot X2 SUGGESTED MINIMUM CONFIGURATIONS av ussn Mason Rm Intel Celerun D or AMD Sempron or Inlel Pemium DualCare or Intel Core 2 Duo ur AMD Aihlun 64 X2 DualCate Minimum RAM 1 GE Intel itanium 2 or AMD Quad Core Opieran or Intel Quad Core Xeon Minimum HAM1 GB SMALL FFIGE Intel Cure 2 Duo 0i HUME FFiBE Iniei Cure 2 Quad or AMD Aihion 64 x2 DualCore Minimum RAM39 4 GE Inlel Cure 2 Duo or Inlel Core 2 mud or AMI Aihlan 64 X2 BumCore Minimum RAM39 2 GB Minimum RAM 2 GE p 215 Fig 440 Keeping Your Computer Clean Over time the system unit collects dust even in a clean environment gt Preventative maintenance requires a few basic products p 216 Fig 4 41 Summary of the Components of the System Unit Components of the system unit Comparison of various personal computer processors on the market today memory stores data instructions and information HOW to clean a system unit ence of operations that occur when a computer executes an instruction Chapter 4 Complete Discovering Computers 2009 Chapter 7 Storage Chapter 7 Contents M fwm fge39media Storage What is gt Holds data instructions and information for future use gt is physical material used for storage Also called secondary storage p 354 355 Fig 7 1 Storage What is gt Number of bytes characters a storagemje1jfi39uml canihpld p356 Kilobyte KB 1 thousan d Megabyte MB 1 million Gigabyte GB 1 billion Terabyte TB Petabyte PB Exabyte EB Zettabyte ZB 1 trillion W 1 quadrillion 1 quintillion 1 sextillion Storage How does volatility compare gt Storage medium is contents retained When power is off gt Memory is holds data and instructions temporarily a ON g way 7 mgkiy E ape31 E O gt gt and and new engine muggy u Lea ax ms 2 as 6 33 user Storage Medium Contents Contents 8 hard disks CDs DVDs available to retained 2 USB ash drives etc user p 355 356 Storage What is a Hardware that records and f I retrieves item39s K to and from x storage media Functions as source Creates output of input p 356 Storage What is 9 gt The speed of storage devices and memory measuring 1 Time it takes storage device to locate item on storage medium 2 Time required to deliver item from memory toprocessor p 357 Fig 74 Magnetic Disks use magnetic particles What are and is narrow recording band that forms full circle on disk stores up to 512 bytes of data Te DU 9139 p 357 Fig 75 Magnetic Disks use magnetic particles For reading and writing purposes sectors are grouped into A is the smallest unit of disk space that storeysda39ta and information and consists of two to eight sectors Even if a le consists of only a few bytes it uses an entire cluster Each cluster holds data from only one le but one le can span many clusters p 357 Fig 7 5 Magnetic Disks What is a gt Highcapacity storage gt Consists of several in exible circular platters that store items electronically gt Components enclosed in airtight sealed case for protection p 358 Fig 76 Magnetic Disks What are characteristics of a hard di 393 Luna mgr c25pmpa izx quotE L Previous Vevsinns i Quota Touls Handwara Shaving Type Loca Disk File System NTFS I Used spate 387584111515 bylas 3815 GB FIEE suace 112305840488 byes 111 4 EB B rse d39 43890L 52 95 byes 4931 EB Sectors p e r track Sectors per drive 973773168 Revolutions per minute 7200 Transfer rate 300 MBps Access 8 ms L Compress this duva In save disk space E ndex mg dlive fur rasre 355mm w cancel J p 359 Fig 7 7 Magnetic Disks HOW d0es a hard disk work The mm hoard comrms movement 07 the head actuator and a smaH molm39 ep 2 A sma molar spins 1he matters while We mmpmer is runn ng 5 Step 3 When so ware requests a t sk access me reedwrite heads delsl mhwe the currcm 0 new locatson m the data an 4 The head actuaior posll ons the rearlwrile head arms over ma curred oca on m the planers to read or wrha ralee p 360 Fig 78 Magnetic Disks Whatisa j gt Vertical section of quot 7 track through all platters gt Single movement of readwrite head T arms accesses all Platters 39r e adl wriite 1n head p360 Fig 79 cyllnder Magnetic Disks What is a gt Occurs when readwrite head touches platter suffa c ei gt Usually resultiing in a loss of data or sometimes IQSS nwthe en ire dniye gt Spinning creates cushion of air that oats madlvlvni te he a d aljinye platter readwrite head clearance p 360361 Fig 710 Magnetic Disks What IS a gt 31133 processor uses gfgggw to store tr n t r he 7 f r requested Hem Step bl ioihe processor 1 quotthe toquot requ 61151 5 does rigtnfirnd in accesse l ems requested item In 1 k 11 H L Stem 1ued AspacIaIpurpase K on the haul disk s chip on the hard disk 39 pla V caHed a conimller receives or infurma iun frdm39me i prucessur an a g 5 Qquot 3 a 3 a a s 5 j m Step 2 The wnlwher Hysl checks disk cache for the reqllasted item p 361 Fig 7 11 Magnetic Disks What is gt Redundant Array of Independent Disks gt A group of two or more integrated hard disks gt Connects multiple smaller disks into a single unit that acts as a single large hard disk p362 Magnetic Disks What is a gt Provide greater storage capacities than flash memory gt Smaller than notebook computer hard disks gt A as another type of miniature hard disk is a selfcontained unit p 362 Fig 713 Magnetic Disks What are hard disks and hard disks gt Used to back up or transfer files hard disk hard disk hard disk freestanding that you insert and remove hard disk that connects to system unit frOm hard diSk dITiVQ removable ham disk drive p 363 Fig 714 Magnetic Disks What is a gt CnilLand circuits thatcontrol transfer of items from disk wkquot 7 39 quotx EIDE Enhanced Integrated Drive 3 m Electronics controller supports four 1mm hard disks provides connections for nnm m CD and DVD dIiveS SCSI controller supports up to fteen quot devices including hard disks CD and DVD drives tape drives printers scanners network cards p363364 Magnetic Disks What is gt Service on Web that provides storage for minimal monthly fee u m gt Files can be accessed from any computer with Web access Protectyour Photos gt Large files can be downloaded 12351ij if if instantaneously f quot 7 739 39 gt Others can be authorized to access your data p 364 365 Fig 7 15 Magnetic Disks What is a gt Portable inexpensive storage medium also called diskette Thin circular exible film enclosed in 35 Wide plastic shell p 365 Fig 716 Optical Discs What are gt Flat round portable metal discs made of metal plastic and lacquer gt Can be read only or readwrite gt Most PCs include an optical disc drive p 366 Fig 7 17 Optical Discs How does a laser read data on an optical disc disc labe 1 LL39 quot39 v 39 394L ens pit Ian i lens o prism I I ight sensmg 7 diode laser giode p 367 Fig 718 Optical Discs How is data stored on an optical disc gt Typically stored in dlnsi c l is single track gt Track divided into evenly sized sectors that store items Elli I M915 5 S 1 v Eg iioe ase p 367 Fig 7 19 Optical Discs What is a quot gt gt gt gt p 369 Fig 7 22 Compact disc readonly memory Cannot erase or modify contents Typically holds 650 MB to 1 GB Commonly used to distribute multimedia and complex software


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