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College of Computer and Information Science Chapter 8 Secondary Storage.

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Presentation on theme: "College of Computer and Information Science Chapter 8 Secondary Storage."— Presentation transcript:

1 College of Computer and Information Science Chapter 8 Secondary Storage

2 College of Computer and Information Science 8-2 Key Words & Terms access speed: Blu-Ray (BR): capacity: CD (compact disc): CD-R (CD-recordable): CD CD-ROM (compact disc-read only memory): CD CD-ROM jukebox: CD-ROM CD-RW (compact disc rewritable): CD cylinder: density: direct access: disk caching: DVD (digital versatile disc or digital video disc): DVD player: DVD DVD-R or DVD+R (DVD recordable): DVD-RAM (DVD-random-access memory): DVD

3 College of Computer and Information Science 8-3 Key Words & Terms DVD-ROM (digital versatile disc-read only memory): DVD DVD-RW or DVD+RW (DVD rewritable): DVD enterprise storage system: Erasable optical disk: file compression: file decompression: file server: flash memory card: floppy disk: floppy disk cartridge: floppy disk drive (FDD): hard disk: hard-disk cartridge: hard-disk pack: HD DVD (high-definition DVD): DVD head crash: hi def (high definition):

4 College of Computer and Information Science 8-4 Key Words & Terms magnetic tape: magnetic tape reel: magnetic tape streamer: mass storage: mass storage devices: media: optical disk: optical disk drive: organizational Internet storage: PC Card hard disk: PC pit: primary storage: RAID system:

5 College of Computer and Information Science 8-5 Key Words & Terms redundant arrays of inexpensive disks (RAID): secondary storage: secondary storage device: sector: sequential access: shutter: software engineer: solid-state storage: storage devices: tape cartridge: tape library track: USB drive: USB write-protection notch:

6 College of Computer and Information Science 8-6 Competencies (Page 1 of 2) Distinguish between primary and secondary storage Describe the traditional floppy disk and compare it to high capacity floppy disks Compare internal hard disks, hard-disk cartridges, and hard-disk packs Page 218

7 College of Computer and Information Science 8-7 Competencies (Page 2 of 2) Describe ways to improve hard-disk operations, including disk caching, redundant arrays of inexpensive disks, and data compression and decompression Discuss the different types of optical disks Describe solid-state storage, Internet drives, and magnetic tape Discuss mass storage and mass storage devices Page 218

8 College of Computer and Information Science 8-8 Introduction Data storage has expanded from text and numeric files to include digital music files, photographic files, video files, and much more. These new types of files require secondary storage devices with much greater capacity than floppy disks. In this chapter, you will learn about the many types of secondary storage devices including their capabilities and limitations. Page 219

9 College of Computer and Information Science 8-9 Storage Primary storage –Volatile storage –Temporary storage Secondary storage –Nonvolatile storage –Permanent storage Secondary storage characteristics –Media –Capacity –Storage devices –Access speed Page 220

10 College of Computer and Information Science 8-10 Secondary Storage Devices Most desktop microcomputer systems have floppy disks, hard disks, and optical disk drives Are used to save, back up, and transport data files and programs Page 220

11 College of Computer and Information Science 8-11 Floppy Disks Portable or removable storage media Typically used to store and transfer small word processing, spreadsheet, and other types of files Floppy disk drives (FDD) –Store data and programs –Retrieves data by reading electromagnetic charges –Also called flexible disks and floppies Page 220

12 College of Computer and Information Science 8-12 Traditional Floppy Disk Most common type is 2HD two-sided, high- density Attributes –Shutter –Labels –Write-protection notch –Tracks –Sectors Page 221

13 College of Computer and Information Science 8-13 High Capacity Floppy Disks Known as a floppy-disk cartridge Require special disk drives Most widely used is the Zip disk –100 MB, 250 MB or 750 MB capacity –Used to store multimedia, database, large text, and spreadsheet files Page 221

14 College of Computer and Information Science 8-14 Hard Disks Use thicker, metallic platters for storage Faster than a floppy diskette Large capacity Sensitive instruments There are three types of hard disks: –Internal Hard DiskInternal Hard Disk –Hard-disk cartridgeHard-disk cartridge –Hard-disk packHard-disk pack Performance Enhancements Page 221

15 College of Computer and Information Science 8-15 Materials that Cause a Head Crash Head crash is a disaster for a hard disk Page 222 Return

16 College of Computer and Information Science 8-16 Internal Hard Disk Located inside system unit Designated as the C drive Advantages over floppies –Capacity –Access speed Page 222 Return

17 College of Computer and Information Science 8-17 Hard-Disk Cartridges Removable hard disks Used to complement internal hard disk Capacities of 20 to 100 GB Iomega is one of the most widely used PC Card Hard Disks Page 223 Hard-disk cartridge Return

18 College of Computer and Information Science 8-18 Hard-Disk Packs Removable hard disk Massive storage capacity Common in mainframes Are utilized by banks and credit card companies Page 224 Return

19 College of Computer and Information Science 8-19 Performance Enhancements Disk caching Redundant arrays of inexpensive disks (RAID) File compression and decompression Page 225

20 College of Computer and Information Science 8-20 Optical Disks Hold over 50 gigabytes of data Attributes –Lands –Pits Three types –Compact Disc (CD)Compact Disc (CD) –Digital Versatile Disc (DVD)Digital Versatile Disc (DVD) –Hi-Def DiscHi-Def Disc Page 226

21 College of Computer and Information Science 8-21 Compact Disc Optical format From 650 MB to 1 GB capacity Rotation speeds vary Three basic types –Read only: CD-ROM –Write once: CD-R –Rewriteable: CD-RW Page 226 Return

22 College of Computer and Information Science 8-22 Digital Versatile Disc Digital Versatile Disc or Digital Video Disc (DVD) Similar to CDs, but can store more data Three basic types –Read only: DVD-ROM –Write once: DVD+R; DVD-R –Rewritable: DVD+RW; DVD-RW; DVD-RAM Page 226 Return

23 College of Computer and Information Science 8-23 High-Definition Disc Next generation of optical disc Far greater capacity than DVDs Three basic types –Read only –Write once –Rewriteable Two competing hi def formats –HD DVD –Blu-Ray Page 227

24 College of Computer and Information Science 8-24 Other Types of Secondary Storage Solid-state storage Internet hard drives Magnetic tape Page 229

25 College of Computer and Information Science 8-25 Ipods and Music From The Internet The Internet can be used as a medium to locate and play music A user can create compact discs, or transfer music to a portable player Requirements –Software –Hardware –Internet Page 230

26 College of Computer and Information Science 8-26 Solid-State Storage Flash memory cards –Widely used in notebook computers –Used to record MP3 music files USB drives –Key ring flash memory devices or flash drives –Connects to a USB port Page 232 Return Key ring flash memory Flash memory card

27 College of Computer and Information Science 8-27 Internet Hard Drives Known as i-drive or online storage Low cost and can access information from any location using the Internet Oriented to either businesses or individuals Page 232 Return

28 College of Computer and Information Science 8-28 Magnetic Tape External storage Provides sequential access –Information stored in sequence –Slower than disks which provide direct access Magnetic tape streamers or tape cartridges used by both mainframes and microcomputers Page 232

29 College of Computer and Information Science 8-29 Mass Storage Devices Mass storage refers to the tremendous amount of secondary storage required by large organizations Mass storage devices are specialized high- capacity secondary storage devices Enterprise storage system promotes efficient and safe use of data across networks within organizations Page 233

30 College of Computer and Information Science 8-30 Discussion Questions (Page 1 of 2) Discuss the traditional and high-capacity floppy disks. What are the three types of hard disks? Describe three ways to improve hard disk performance. What are the two most common optical disk formats? What is hi def? Describe the basic types for each format. Page 242

31 College of Computer and Information Science 8-31 Discussion Questions (Page 2 of 2) Discuss solid-state storage, Internet hard drives, and magnetic tape. What are the advantages and disadvantages of each? Discuss mass storage, enterprise storage systems, and mass storage devices. Page 242

32 College of Computer and Information Science 8-32 Crossword Puzzle Answers: Across Num.ClueAnswer 5 Improves hard-disk performance by anticipating data needs. Disk caching 6 Web-based storage. Internet drive 7 Invisible wedge-shaped division of a track. Sector 8 Portable and removable storage device. Floppy 10 Runs through each track of a stack of platters. Cylinder 11 How tightly the bits can be packed next to each other. Density Down Num.ClueAnswer 1 Ring of concentric circles without visible grooves. Track 2 Grouped disk drives treated as one hard disk by the computer system. RAID 3 Measures the amount of time required to retrieve data. Access time 4 Represent 1s and 0s. Pits and lands 9 Disk with 500 times the storage as a standard floppy. Zip

33 College of Computer and Information Science 8-33 Answers for Multiple Choice and Matching NumMultiple Choice AnswersMatching Answers 1AG 2AA 3CJ 4AI 5CD 6AB 7CH 8DC 9DF 10CE

34 College of Computer and Information Science 8-34 End of Chapter 8


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