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McGraw-Hill Technology Education © 2006 by the McGraw-Hill Companies, Inc. All rights reserved. 8 8 C H A P T E R SECONDARY STORAGE

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Page 1: McGraw-Hill Technology Education © 2006 by the McGraw-Hill Companies, Inc. All rights reserved. 88 CHAPTER SECONDARY STORAGE

McGraw-Hill Technology Education © 2006 by the McGraw-Hill Companies, Inc. All rights reserved.

8888CH

AP

TE

R

SECONDARY STORAGE

Page 2: McGraw-Hill Technology Education © 2006 by the McGraw-Hill Companies, Inc. All rights reserved. 88 CHAPTER SECONDARY STORAGE

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Competencies (Page 1 of 2)

Distinguish between primary & secondary storageDescribe the traditional floppy disk and compare it to high capacity floppy disksCompare internal hard disks, hard-disk cartridges, and hard-disk packs

Page 210

Page 3: McGraw-Hill Technology Education © 2006 by the McGraw-Hill Companies, Inc. All rights reserved. 88 CHAPTER SECONDARY STORAGE

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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; mass storage

Describe solid-state storage, Internet drives, and magnetic tape

Page 210

Page 4: McGraw-Hill Technology Education © 2006 by the McGraw-Hill Companies, Inc. All rights reserved. 88 CHAPTER SECONDARY STORAGE

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Storage

Primary storageVolatile

Temporary

Secondary storageNonvolatile

Permanent

Secondary storage characteristics

Media

Capacity

Storage devices

Access speed

Page 212

Page 5: McGraw-Hill Technology Education © 2006 by the McGraw-Hill Companies, Inc. All rights reserved. 88 CHAPTER SECONDARY STORAGE

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Secondary Storage Devices

Most desktop microcomputer systems have floppy disks, hard disks, and optical disk drives

Page 212

Page 6: McGraw-Hill Technology Education © 2006 by the McGraw-Hill Companies, Inc. All rights reserved. 88 CHAPTER SECONDARY STORAGE

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Traditional Floppy DiskAlso known as:

Diskettes

Floppies

Portable storage media

Floppy disk drives (FDD)

Page 212

Insert Art Work top of page 213

Page 7: McGraw-Hill Technology Education © 2006 by the McGraw-Hill Companies, Inc. All rights reserved. 88 CHAPTER SECONDARY STORAGE

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High Capacity Floppy Disks

Known as a floppy-disk cartridge

Require special disk drives

Three well known typesZip disks

HiFD disks

SuperDisks

Page 214

Page 8: McGraw-Hill Technology Education © 2006 by the McGraw-Hill Companies, Inc. All rights reserved. 88 CHAPTER SECONDARY STORAGE

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Hard DisksUse thicker, metallic platters for storage

Faster than a floppy diskette

Large capacity

Sensitive instruments

There are three types of hard disks:Internal

Hard-disk cartridge

Hard-disk pack

Page 215

Page 9: McGraw-Hill Technology Education © 2006 by the McGraw-Hill Companies, Inc. All rights reserved. 88 CHAPTER SECONDARY STORAGE

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Internal Hard Disk

Located inside system unit

Known as a fixed disk

Designated as the C drive

Advantages over floppies

Access speed

Capacity

Page 215

Page 10: McGraw-Hill Technology Education © 2006 by the McGraw-Hill Companies, Inc. All rights reserved. 88 CHAPTER SECONDARY STORAGE

CE06_PP08-11

Hard-Disk Cartridges

Removable hard disks

Used to complement

internal hard disk

Capacities of 10 to 20

GB

PC Card Hard Disks

Page 216

Hard-disk cartridge

Page 11: McGraw-Hill Technology Education © 2006 by the McGraw-Hill Companies, Inc. All rights reserved. 88 CHAPTER SECONDARY STORAGE

CE06_PP08-12

Hard-Disk Packs

Removable hard disk

Massive storage capacity

Common in mainframes

Resembles stack of vinyl records

Page 216

Page 12: McGraw-Hill Technology Education © 2006 by the McGraw-Hill Companies, Inc. All rights reserved. 88 CHAPTER SECONDARY STORAGE

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Hard Disk Performance Enhancements

Disk caching

Redundant arrays of inexpensive disks (RAID)

File compression and decompression

Page 217

RAID storage device

Page 13: McGraw-Hill Technology Education © 2006 by the McGraw-Hill Companies, Inc. All rights reserved. 88 CHAPTER SECONDARY STORAGE

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Optical Disks

Compact

Permanent storage

Laser beams reflect off pits

Two common typesCD

DVD

Page 219

Page 14: McGraw-Hill Technology Education © 2006 by the McGraw-Hill Companies, Inc. All rights reserved. 88 CHAPTER SECONDARY STORAGE

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Compact Disc

Optical format

From 650 MB to 1 GB capacity

Rotation speeds vary

Types Read only: CD-ROM

Write once: CD-R

Rewriteable: CD-RW

Picture CDs and Photo CDs

Page 219

Page 15: McGraw-Hill Technology Education © 2006 by the McGraw-Hill Companies, Inc. All rights reserved. 88 CHAPTER SECONDARY STORAGE

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Digital Versatile Disc

Digital Versatile Disk or Digital Video Disk (DVD)

Similar to CDs, but can store more data

TypesRead only: DVD-ROM

Write once: DVD+R; DVD-R

Rewritable: DVD+RW; DVD-RW; DVD-RAM

Page 220

Page 16: McGraw-Hill Technology Education © 2006 by the McGraw-Hill Companies, Inc. All rights reserved. 88 CHAPTER SECONDARY STORAGE

CE06_PP08-17

Other Types of Secondary Storage

Solid-state storage

Internet hard drives

Magnetic tape

Page 221

Page 17: McGraw-Hill Technology Education © 2006 by the McGraw-Hill Companies, Inc. All rights reserved. 88 CHAPTER SECONDARY STORAGE

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A Look to the FutureBlu-Ray and Plastic Memory Technology

New standard in storage is called Blu-Ray

New disks use blue laser light instead of the red laser light used in traditional CD players

Disks may ultimately hold Over 50GB on two-sided disks

Equals several movies/TV shows

Help to reduce incompatibility

problems

Page 227

Page 18: McGraw-Hill Technology Education © 2006 by the McGraw-Hill Companies, Inc. All rights reserved. 88 CHAPTER SECONDARY STORAGE

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Discussion Questions (Page 1 of 2)

Discuss the three most likely successors to the 1.44 MB 3 ½ inch floppy.

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? Describe the basic types for each format.

Page 234

Page 19: McGraw-Hill Technology Education © 2006 by the McGraw-Hill Companies, Inc. All rights reserved. 88 CHAPTER SECONDARY STORAGE

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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 234


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