materi6 storage

Chapter 6Storage

Review

6 parts of the IT model

Storage devices

Today we will be discussing 10 different types of storage devices.

How many can you name?

Storage

What is storage?

p. 210 Fig. 6-1 Next

Computer Hardware that holds data, instructions, and information for future use

Storage medium is physical material used for storage

Also called secondary storage

Storage

What is capacity?

p. 212 Next

Kilobyte (KB) 1 thousand – 1,000

Megabyte (MB) 1 million – 1,000,000

Gigabyte (GB) 1 billion – 1,000,000,000

Terabyte (TB) 1 trillion – 1,000,000,000,000

Petabyte (PB) 1 quadrillion – 1,000,000,000,000,000

Number of bytes (characters) a storage medium can hold

Exabyte (EB) 1 quintillion – 1,000,000,000,000,000,000

Zettabyte (ZB) 1 sextillion – 1,000,000,000,000,000,000,000

WritingWritingProcess of transferring Process of transferring

items from memory items from memory to storage mediato storage media

WritingWritingProcess of transferring Process of transferring

items from memory items from memory to storage mediato storage media

How does storage work?

p. 212 Next

ReadingReadingProcess of transferring Process of transferring

items from storage items from storage media to memorymedia to memory

ReadingReadingProcess of transferring Process of transferring

items from storage items from storage media to memorymedia to memory

Hardware that Hardware that records and records and

retrieves items retrieves items to and from to and from

storage mediastorage media

Storage DeviceStorage DeviceMemoryMemory

Floppy Disks

What is a floppy disk?

p. 212 Next

Portable, inexpensive storage medium (also called diskette)

Floppy Disks

What is a floppy disk drive?


Floppy disk drive built intoa desktop computer

External floppy disk drive attaches toa computer with a cable

One floppy drive, named drive A If two floppy drives, second

designated as drive B

Device that reads from andwrites to floppy disk

Floppy Disks


What are tracks and sectors?

Trackis narrow

recording bandthat forms fullcircle on disk

Sector stores up to512 bytes

of data

Formatting prepares disk for use and marks bad sectors as unusable

Hard Disks

What is a hard disk?


hard disk installedin system unit

High-capacity storage

Consists of several inflexible, circular platters that store items electronically

Components enclosed in airtight, sealed case for protection

Hard Disks

What is a head crash?

p. 217 Fig. 6-10 Next

clearance

read/write head

platter

hair

dustsmoke

Spinning creates cushion of air that floats read/write head above platter

Occurs when read/write head touches platter surface

A smoke particle, dust particle, or human hair could render drive unusable

Clearance between head and platter is approximately two-millionths of an inch

Hard Disks

What are external hard disks and removable hard disks?

p. 217 Fig. 6-11 Next

External hard disk—freestandinghard disk that connects to system unit

Removable hard disk—hard diskthat you insert and removefrom hard disk drive

Push the same buttonto close the tray.

CDs and DVDs

What are CDs and DVDs?

p. 219 Fig. 6-13 Next

Most PCs include CD or DVD drive, most play audio CDs

Flat, round, portable metal discs made of metal, plastic, and lacquer

Can be read only or read/write

Insert the disc,label side up.

Push the button toslide out the tray.

CDs and DVDs

Disk Format Read Write

Erase Size

CD-ROM X Up to 1GB

CD-R X X

CD-RW X X X

DVD-ROM X 4 – 17 GB

DVD-R,

DVD+R

X X

DVD-RW

DVD+RW

DVD+RAM

X X X

Miniature Mobile Storage Media

What is miniature mobile storage media?

p. 225 Fig. 6-22 Next

Storage for small mobile devices

Smart Media

xD Picture Card

CompactFlash Secure Digital

Memory Stick Microdrive

Click to view Web Link,click Chapter 6, Click Web Linkfrom left navigation, then click Flash Memory Cards below Chapter 6


What is a USB flash drive?

p. 226 Fig. 6-24 Next

Sometimes called a keychain drive

Plugs into a USB port on a computer or portable device


What is a smart card? Stores data on microprocessor

embedded in small card

Medical information Vaccination data Health-care ID info Customer purchases Employee attendance Prepaid money

Microfilm and Microfiche

What are microfilm and microfiche?

p. 228 Fig. 6-26 Next

Images recorded using Images recorded using computer output microfilm recordercomputer output microfilm recorder

Store microscopic images of Store microscopic images of documents on roll or sheet of filmdocuments on roll or sheet of film

Microfilm and Microfiche

How do life expectancies of various media compare?

p. 228 Fig. 6-27 Next

Media Life Expectancies

Magnetic disks 3 to 5 years 20 to 30 years

CDs and DVDs discs 5 to 10 years 50 to 100 years

Microfilm 100 years 500 years

Media Type Guaranteed Life Potential LifeExpectancy Expectancy

Microfilm and microfiche have longest life of any storage media

Is it ethical to use pirated CDs or DVDs?

Evens vs Odds

Is it ethical to download and copy for free portions of a music CD, or an entire music CD?

If you purchase a CD or DVD is it ethical to make copies for distribution?

Is it ethical to make a recording of a song, movie, or video for distribution?

Should recording or movie companies be able to use formatting techniques to keep people from copying CDs or DVDs?

Sports cards with storage

Today’s sports cards are different from those you once traded. Topps has introduced a series of plastic baseball cards, each of which has four seconds of game footage from Kodak. Eventually, Kodak hopes to add sound chips to the $10 cards. When the rectangular (yes, rectangular) $20 cards are inserted into a CD-ROM drive, they display a host of statistics, present personal information, and even show video highlights analyzing individual playing styles.

• Will the new sports cards eventually replace traditional trading cards?

• Why or why not?

• In light of what you have learned regarding computer storage, how else might sports cards be different in the future?

Smart cards

For more than 10 years, intelligent smart cards have been in use throughout Europe. The United States has adopted the use of this technology only recently, and the trend is continuing. Smart card technology offers the potential for improving security on the Internet by verifying user identification. It can hold and update sensitive and critical data, such as medical history, and could replace identification cards and other records. The market indicates that this technology will play an important role in contemporary life. Many experts argue that the smart card is not secure and safe enough to store vital information.

• Why are smart cards more popular in Europe than in the United States?

• Do you think the average American is willing to store his or her medical or personal information on an intelligent smart card? Would you?

• What misconceptions affect the way American society perceives the use of this technology?

• Is security the main issue in acceptance of the smart card?

Read article

Is it ethical for technology companies to locate in small towns?

materi6 storage

Education