Your Interactive Guide to the Digital World Discovering Computers 2012. - презентация

1 Your Interactive Guide to the Digital World Discovering Computers 2012

2 Objectives Overview Differentiate between storage devices and storage media Describe the characteristics of an internal hard disk including capacity, platters, read/write heads, cylinders, sectors and tracks, revolutions per minute, transfer rate, and access time Discuss the purpose of network attached storage devices, external and removable hard disks, and hard disk controllers Describe the various types of flash memory storage Discovering Computers 2012: Chapter 7 2 See Page 351 for Detailed Objectives

3 Objectives Overview Describe cloud storage and explain its advantages Describe the characteristics of optical discs Differentiate among various types of optical discs: CDs, archive discs and Picture CDs, DVDs, and Blu-ray Discs Identify the uses of tape, magnetic stripe cards, smart cards, microfilm and microfiche, and enterprise storage Discovering Computers 2012: Chapter 7 3 See Page 351 for Detailed Objectives

4 Storage Storage holds data, instructions, and information for future use A storage medium is the physical material on which a computer keeps data, instructions, and information Discovering Computers 2012: Chapter 7 4 Pages

5 Storage Discovering Computers 2012: Chapter 7 5 Pages 352 – 353 Figure 7-1

6 Storage Capacity is the number of bytes a storage medium can hold Discovering Computers 2012: Chapter 7 6 Page 354 Figure 7-2

7 Storage A storage device is the computer hardware that records and/or retrieves items to and from storage media Discovering Computers 2012: Chapter 7 7 Page 354 Reading is the process of transferring items from a storage medium into memory Writing is the process of transferring items from memory to a storage medium

8 Storage Access time measures: – The amount of time it takes a storage device to locate an item on a storage medium – The time required to deliver an item from memory to the processor Discovering Computers 2012: Chapter 7 8 Page 355 Figure 7-4

9 Hard Disks A hard disk contains one or more inflexible, circular platters that use magnetic particles to store data, instructions, and information Discovering Computers 2012: Chapter 7 9 Page 355 Figure 7-5

10 Hard Disks Hard disks can store data using longitudinal recording or perpendicular recording Discovering Computers 2012: Chapter 7 10 Page 356 Figure 7-6

11 Hard Disks Characteristics of a hard disk include: Discovering Computers 2012: Chapter 7 11 Page 357 Figure 7-8 CapacityPlatters Read/Write Heads Cylinders Sectors and Tracks Revolutions per Minute Transfer Rate Access Time

12 Hard Disks Formatting is the process of dividing the disk into tracks and sectors so that the operating system can store and locate data and information on the disk Discovering Computers 2012: Chapter 7 12 Page 357 Figure 7-7

13 Hard Disks Discovering Computers 2012: Chapter 7 13 Page 358 Figure 7-9

14 Hard Disks The hard disk arms move the read/write head, which reads items and writes items in the drive – Location often is referred to by its cylinder Discovering Computers 2012: Chapter 7 14 Page 358 Figure 7-10

15 Hard Disks A head crash occurs when a read/write head touches the surface of a platter Always keep a backup of your hard disk Discovering Computers 2012: Chapter 7 15 Pages 358 – 359 Figure 7-11

16 Hard Disks Discovering Computers 2012: Chapter 7 16 Page 359 Figure 7-12

17 Hard Disks RAID (redundant array of independent disks) is a group of two or more integrated hard disks A network attached storage (NAS) device is a server connected to a network with the sole purpose of providing storage Discovering Computers 2012: Chapter 7 17 Page 360 Figure 7-13

18 Hard Disks An external hard disk is a separate free- standing hard disk that connects to your computer with a cable or wirelessly A removable hard disk is a hard disk that you insert and remove from a drive Internal and external hard disks are available in miniature sizes (miniature hard disks) Discovering Computers 2012: Chapter 7 18 Pages 360 – 361 Figures 7-14 – 7-15

19 Hard Disks A disk controller consists of a special-purpose chip and electronic circuits that control the transfer of data, instructions, and information from a disk to and from the system bus and other components of the computer Discovering Computers 2012: Chapter 7 19 Pages SATAEIDE SCSISAS

20 Flash Memory Storage Flash memory chips are a type of solid state media Solid state drives (SSDs) have several advantages over magnetic hard disks: Discovering Computers 2012: Chapter 7 20 Pages Faster access timeFaster transfer rates Generate less heat and consume less power Last longer

21 Flash Memory Storage Discovering Computers 2012: Chapter 7 21 Page 363 Figure 7-17

22 Flash Memory Storage A memory card is a removable flash memory device that you insert and remove from a slot in a computer, mobile device, or card reader/writer Discovering Computers 2012: Chapter 7 22 Page 364 CompactFlash (CF) Secure Digital (SD) Secure Digital High Capacity (SDHC) microSD microSDHC xD Picture Card Memory Stick Memory Stick Micro (M2)

23 Flash Memory Storage Discovering Computers 2012: Chapter 7 23 Pages 364 – 365 Figures 7-18 – 7-19

24 Flash Memory Storage Discovering Computers 2012: Chapter 7 24 Page 366 Figure 7-20

25 Flash Memory Storage USB flash drives plug into a USB port on a computer or mobile device Discovering Computers 2012: Chapter 7 25 Page 367 Figure 7-21

26 Cloud Storage Cloud storage is an Internet service that provides storage to computer users Discovering Computers 2012: Chapter 7 26 Page 368 Figure 7-23

27 Cloud Storage Discovering Computers 2012: Chapter 7 27 Page 368 Figure 7-24

28 Cloud Storage Users subscribe to cloud storage for a variety of reasons: Discovering Computers 2012: Chapter 7 28 Page 369 Access files from any computerStore large files instantaneouslyAllow others to access their filesView time-critical data and images immediatelyStore offsite backupsProvide data center functions

29 Optical Discs An optical disc consists of a flat, round, portable disc made of metal, plastic, and lacquer that is written and read by a laser Typically store software, data, digital photos, movies, and music Read only vs. rewritable Discovering Computers 2012: Chapter 7 29 Page 370 Figure 7-25

30 Optical Discs Discovering Computers 2012: Chapter 7 30 Page 370 Figure 7-26

31 Optical Discs Optical discs commonly store items in a single track that spirals from the center of the disc to the edge Track is divided into evenly sized sectors Discovering Computers 2012: Chapter 7 31 Page 371 Figure 7-27

32 Optical Discs Care of optical discs Discovering Computers 2012: Chapter 7 32 Page 371 Figure 7-28

33 Optical Discs A CD-ROM can be read from but not written to Read from a CD-ROM drive or CD-ROM player A CD-R is a multisession optical disc on which users can write, but not erase A CD-RW is an erasable multisession disc Must have a CD-RW drive Discovering Computers 2012: Chapter 7 33 Pages 372 – 373 Figure 7-29

34 Optical Discs A DVD-ROM is a high-capacity optical disc on which users can read but not write or erase Requires a DVD-ROM drive A Blu-ray Disc-ROM (BD-ROM) has a storage capacity of 100 GB DVD-RW, DVD+RW, and DVD+RAM are high- capacity rewritable DVD formats Discovering Computers 2012: Chapter 7 34 Pages 375 – 376 Figure 7-29

35 Other Types of Storage Discovering Computers 2012: Chapter 7 35 Page 376

36 Other Types of Storage Tape is a magnetically coated ribbon of plastic capable of storing large amounts of data and information A tape drive reads and writes data and information on a tape Discovering Computers 2012: Chapter 7 36 Page 376 Figure 7-35

37 Other Types of Storage A magnetic stripe card contains a magnetic stripe that stores information A smart card stores data on a thin microprocessor embedded in the card Discovering Computers 2012: Chapter 7 37 Page 377 Figure 7-36

38 Other Types of Storage Microfilm and microfiche store microscopic images of documents on a roll or sheet film Discovering Computers 2012: Chapter 7 38 Page 378 Figure 7-37

39 Other Types of Storage Discovering Computers 2012: Chapter 7 39 Page 378 Figure 7-38

40 Other Types of Storage Enterprise storage stores huge volumes of data and information for large businesses – Uses special hardware for heavy use, maximum availability, and maximum efficiency Discovering Computers 2012: Chapter 7 40 Page 379 Figure 7-39

41 Putting It All Together Home user 500 GB hard disk Cloud storage Optical disc drive Card reader/writer USB flash drive Small Office/Home Office user 1 TB hard disk Cloud storage Optical disc drive External hard disk for backup USB flash drive Mobile 250 GB hard disk Cloud storage Optical disc drive Card reader/writer Portable hard disk for backup USB flash drive Discovering Computers 2012: Chapter 7 41 Page 380 Figure 7-40

42 Putting It All Together Discovering Computers 2012: Chapter 7 42 Page 380 Figure 7-40 Power User 2.5 TB hard disk Cloud storage Optical disc drive Portable hard disk for backup USB flash drive Enterprise User (desktop computer) 1 TB hard disk Optical disc drive Smart card reader Tape drive USB flash drive Enterprise User (server or mainframe) Network storage server 40 TB hard disk system Optical disc server Microfilm or microfiche

43 Summary Various storage media and storage devices Internal hard disks, external and removable hard disks, solid state drives, memory cards, USB flash drives, ExpressCard modules, cloud storage, CDs, DVDs, and Blu-ray Discs, tape, smart cards, and microfilm and microfiche Discovering Computers 2012: Chapter 7 43 Page 381

44 Your Interactive Guide to the Digital World Discovering Computers 2012 Chapter 7 Complete