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McGraw-Hill Technology Education © 2006 by the McGraw-Hill Companies, Inc. All rights reserved.
8888CH
AP
TE
R
SECONDARY STORAGE
CE06_PP08-2
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
CE06_PP08-3
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
CE06_PP08-4
Storage
Primary storageVolatile
Temporary
Secondary storageNonvolatile
Permanent
Secondary storage characteristics
Media
Capacity
Storage devices
Access speed
Page 212
CE06_PP08-5
Secondary Storage Devices
Most desktop microcomputer systems have floppy disks, hard disks, and optical disk drives
Page 212
CE06_PP08-6
Traditional Floppy DiskAlso known as:
Diskettes
Floppies
Portable storage media
Floppy disk drives (FDD)
Page 212
Insert Art Work top of page 213
CE06_PP08-7
High Capacity Floppy Disks
Known as a floppy-disk cartridge
Require special disk drives
Three well known typesZip disks
HiFD disks
SuperDisks
Page 214
CE06_PP08-8
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
CE06_PP08-10
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
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
CE06_PP08-12
Hard-Disk Packs
Removable hard disk
Massive storage capacity
Common in mainframes
Resembles stack of vinyl records
Page 216
CE06_PP08-13
Hard Disk Performance Enhancements
Disk caching
Redundant arrays of inexpensive disks (RAID)
File compression and decompression
Page 217
RAID storage device
CE06_PP08-14
Optical Disks
Compact
Permanent storage
Laser beams reflect off pits
Two common typesCD
DVD
Page 219
CE06_PP08-15
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
CE06_PP08-16
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
CE06_PP08-17
Other Types of Secondary Storage
Solid-state storage
Internet hard drives
Magnetic tape
Page 221
CE06_PP08-21
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
CE06_PP08-22
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
CE06_PP08-23
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