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Chapter 6 Storage

Chapter 6 Storage. Chapter 6 Objectives. Next. Differentiate among various CD and DVD formats. Describe the characteristics of magnetic disks. Identify the uses of tape. Describe the characteristics of a hard disk.

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Chapter 6 Storage

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  1. Chapter 6Storage

  2. Chapter 6 Objectives Next Differentiate among various CD and DVD formats Describe the characteristics ofmagnetic disks Identify the uses of tape Describe the characteristics of a hard disk Discuss PC Cards, ExpressCard modules and the various typesof miniature mobile storage media Discuss various types of miniature, external, and removable hard disks Describe the characteristics of optical disks Identify uses of microfilm and microfiche

  3. Storage Next What isstorage? • Holds data, instructions, and information for future use • Storage mediumis physical material used for storage • Also called secondary storage p. 220 - 221 Fig. 6-1

  4. Storage Kilobyte (KB) 1 thousand Megabyte (MB) 1 million Gigabyte (GB) 1 billion Terabyte (TB) 1 trillion Petabyte (PB) 1 quadrillion Exabyte (EB) 1 quintillion Zettabyte (ZB) 1 sextillion Yottabyte (YB) 1 septillion Next What iscapacity? • Number of bytes (characters) a storage medium can hold p. 222

  5. Storage Functions as source of input Creates output Next What is astorage device? Hardware that records and retrieves items to and from storage media Reading Process of transferring items from storage media to memory Writing Process of transferring items from memory to storage media p. 222

  6. Storage Next What isaccess time? • Time it takes storage device to locate item on storage medium • Time required to deliver item from memory to processor p. 222

  7. Magnetic Disks Trackis narrow recording bandthat forms fullcircle on disk Sectorstores up to512 bytesof data Next What aretracks andsectors? Formatting prepares disk for use p. 222 Fig. 6-3

  8. Magnetic Disks Perpendicular recording Longitudinal recording Click to view Web Link,click Chapter 6, Click Web Linkfrom left navigation, then click Perpendicular Recording below Chapter 6 Next What is ahard disk? • High-capacity storage • Consists of several inflexible, circular platters that store items electronically • Components enclosed in airtight, sealed case for protection p. 223 Fig. 6-4

  9. Magnetic Disks Sample Hard Disk Characteristics Advertised capacity 500 GB Platters 4 Read/write heads 8 Cylinders 16,383 Bytes per second 512 Sectors per track 63 Sectors per drive 973,773,168 Revolutions per minute 7,200 Transfer rate 300 MB p/sec Access time 8.5 ms Next What are characteristics of a hard disk? actualdiskcapacity p. 224 Fig. 6-5

  10. Magnetic Disks Next How does a hard disk work? p. 224 Fig. 6-6

  11. Magnetic Disks Next platter What is acylinder? track • Vertical section of track through all platters sector • Single movement of read/write head arms accesses all plattersin cylinder read/writehead platter sides p. 225 Fig. 6-7 cylinder

  12. Magnetic Disks Next What is ahead crash? • Occurs when read/write head touches platter surface • Spinning creates cushion of air that floats read/write head above platter • Clearance between head and platter is approximately two-millionths of an inch • A smoke particle, dust particle, or human hair could render drive unusable p. 225 Fig. 6-8

  13. Magnetic Disks Next What is RAID? • Redundant Array of Independent Disks • Connects multiple smaller disks into a single unit that acts as a single large hard disk p. 226

  14. Magnetic Disks Click to view Web Link, click Chapter 6, Click Web Link from left navigation, then click Miniature Hard Disksbelow Chapter 6 Next What is a miniature hard disk? • Provide greater storage capacities than flash memory • Smaller than notebook computer hard disks • A pocket hard drive is a self-contained unit p. 226 Fig. 6-9 and 6-10

  15. Magnetic Disks Next What areexternal hard disksandremovable hard disks? • Used to back up or transfer files Removable hard disk—hard diskthat you insert and removefrom hard disk drive External hard disk—freestandinghard disk that connects to system unit p. 226 Fig. 6-11

  16. Magnetic Disks EIDE (EnhancedIntegratedDrive Electronics) controller supports four hard disks, provides connections for CD and DVD drives SCSIcontroller supports up to fifteendevices including hard disks, CDand DVD drives, tape drives, printers, scanners, network cards SATA (Serial Advanced Technology Attachment) controller uses serial signals to transfer data, instructions, and information SAScontroller supports many connecteddevices at once, including hard disks,CD and DVD drives, printers,scanners, digital cameras, and more Next What is adisk controller? • Chip and circuits that control transfer of items from disk Click to view Web Link, click Chapter 6, Click Web Linkfrom left navigation, then click SASbelow Chapter 6 p. 227

  17. Magnetic Disks Next What is online storage? • Service on Web that provides storage for minimal monthly fee • Files can be accessed from any computer with Web access • Others can be authorized to access your data p. 228 Fig. 6-12

  18. Magnetic Disks Next What is afloppy disk? • Portable, inexpensive storage medium (also called diskette) Thin, circular, flexible film enclosedin 3.5” wide plastic shell p. 228

  19. Magnetic Disks Next What is afloppy disk drive? • Device that reads from andwrites to floppy disk • Also called secondary storage External floppy disk drive attaches to a computer with a cable p. 228 Fig. 6-13

  20. Optical Discs Next What areoptical discs? Push the button toslide out the tray. • Flat, round, portable metal discs made of metal, plastic, and lacquer • Can be read only or read/write Insert the disc. • Most PCs include an optical disc drive Push the same button to close the tray. p. 229 Fig. 6-14

  21. Optical Discs Next How should you care for an optical disc? p. 230 Fig. 6-15

  22. Optical Discs Click to view Web Link,click Chapter 6, Click Web Link from left navigation, then click CD-ROMsbelow Chapter 6 Next What is aCD-ROM? • Compactdiscread-onlymemory • Cannot erase or modify contents • Typically holds 650 MB to 1 GB • Commonly used to distribute multimedia and complex software p. 231 Fig. 6-17

  23. Optical Discs Click to view Web Link,click Chapter 6, Click Web Linkfrom left navigation, then click Archive CDs below Chapter 6 Next What is anArchive CD? p. 232 Fig. 6-18

  24. Optical Discs Next What areCD-Rs and CD-RWs? Must haveCD recorderor CD-R drive CD-R (compact disc-recordable) —cdisc you can write on once Cannot erasedisc’s contents CD-RW (compact disc-rewritable) —ceerasable disc you can write onmultiple times Must haveCD-RW softwareandCD-RW drive p. 232 - 233

  25. Optical Discs CLICK TO START Next Video: Got Your Video Right Here

  26. Optical Discs Next What is aDVD-ROM(digital versatile disc-ROM or digital video disc-ROM)? • Must haveDVD-ROM driveor DVD player to read DVD-ROM • Stores databases, music, complex software, and movies • Blu-ray discs have storage capacity of up to 100 GB • HD-DVD discs have storage capacity of up to 60 GB • HD-VMDs have storage capacity of up to 40 GB or more • UMD can store up to 1.8 GB p. 233 Fig. 6-19

  27. Optical Discs Click to view Web Link,click Chapter 6, Click Web Linkfrom left navigation, then click Blu-ray and HD DVDbelow Chapter 6 Next How does a DVD-ROM store data? • Two layers of pits are used, lower layer is semitransparent so laser can read through • Some are double-sided • Many types of recordable and rewritable DVDs are available • DVD-R and DVD+R • DVD-RW, DVD+RW, and DVD-RAM p. 233 - 234 Fig. 6-20

  28. Tape Next What istape? • Magnetically coated plastic ribboncapable of storing large amountsof data at low cost • Primarily used for backup p. 234 Fig. 6-21

  29. Tape Next How is data stored on a tape? • Sequential access • Reads and writes data consecutively, like music tape • Unlike direct access — used on hard disks, CDs, and DVDs — which can locate particular item immediately p. 235

  30. PC Cards and ExpressCard Modules Next What arePC Cards and ExpressCard Modules? • Adds capabilities to computer • Credit-card-sized device commonly used in notebook computers p. 235 Figs. 6-22

  31. Miniature Mobile Storage Media Click to view Web Link,click Chapter 6, Click Web Linkfrom left navigation, then click microSD Cardsbelow Chapter 6 Next What isminiature mobile storage media? • Storage for small mobile devices p. 236 Fig. 6-23

  32. Miniature Mobile Storage Media Next What is aUSB Flash Drive? • Plugs in a USB port on a computer or mobile device • Storage capacities up to 64 GB • Making the floppy disk nearly obsolete p. 237 Fig. 6-24

  33. Miniature Mobile Storage Media Next What is asmart card? • Stores data on microprocessor embedded in small card • Input, process, output, and storage capabilities p. 237 Fig. 6-25

  34. Microfilm and Microfiche Microfilm – 100 – to 215 – foot roll of film Microfiche – small sheet of film, usually 4”  6” Next What aremicrofilmandmicrofiche? Store microscopic images of documents on roll or sheet of film Images recorded using computer output microfilm recorder p. 238 Fig. 6-26

  35. Microfilm and Microfiche Next How do life expectancies of various media compare? • Microfilm and microfiche have longest life of any storage media p. 238 Fig. 6-27

  36. Putting It All Together Next What are recommended storage devices for home users? • 320 GB hard disk • Online storage • CD or DVD drive • Card reader/writer • USB flash drive p. 239 Fig. 6-28

  37. Putting It All Together Next What are recommended storage devices for small office/home office (SOHO) users? • 1 TB hard disk • Online storage • CD or DVD drive • External hard drive for backup • USB flash drive p. 239 Fig. 6-28

  38. Putting It All Together Next What are recommended storage devices for mobile users? • 250 GB hard disk • Online storage • CD or DVD drive • Card reader/writer • Portable hard disk for backup • USB flash drive p. 239 Fig. 6-28

  39. Putting It All Together Next What are recommended storage devices for power users? • 2.5 TB hard disk • Online storage • CD or DVD drive • Portable hard disk for backup • USB flash drive p. 239 Fig. 6-28

  40. Putting It All Together Next What are recommended storage devices for large business users? • Desktop computer • 1 TB hard disk • CD or DVD drive • Smart card reader • Tape drive • USB flash drive • Server or Mainframe • Network storage server • 40 TB hard disk system • CD-ROM or DVD-ROM server • Microfilm or microfiche p. 239 Fig. 6-28

  41. Summary of Storage Recordable and rewritable DVDs Internal hard disks Tape External and Removable hard disks PC Cards and ExpressCard Modules Floppy disks Flash memory cards CD-ROMs USB Flash Drives Recordable and Rewritable CDs DVD-ROMs Smart Cards Blu-ray Discs and HD DVD discs Microfilm and microfiche Chapter 6 Complete

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