3. Storage devices
Today we will be discussing 10 different types of
storage devices.
How many can you name?
4. Storage
What is storage?
Also called secondary
storage
Computer Hardware that holds data, instructions, and
information for future use
Storage medium is physical material used for storage
p. 210 Fig. 6-1 Next
5. Storage
What is capacity?
Number of bytes (characters) a storage medium can hold
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
Exabyte (EB) 1 quintillion – 1,000,000,000,000,000,000
Zettabyte (ZB) 1 sextillion – 1,000,000,000,000,000,000,000
p. 212 Next
7. Floppy Disks
What is a floppy disk?
Portable, inexpensive storage medium (also called
diskette)
p. 212 Next
8. Floppy Disks
What is a floppy disk drive?
Floppy disk drive built into
a desktop computer
Device that reads from and
writes to floppy disk
One floppy drive, named drive A
If two floppy drives, second
designated as drive B
External floppy disk drive attaches to
a computer with a cable
p. 212 Fig. 6-3 Next
9. Floppy Disks
What are tracks and sectors?
Track
is narrow
recording band
that forms full
circle on disk
Sector
stores up to
512 bytes
of data
Formatting prepares disk for use and marks bad sectors as unusable
p. 213 Fig. 6-4 Next
10. Hard Disks
What is a hard disk?
hard disk installed
in system unit
High-capacity storage
Consists of several inflexible,
circular platters that store
items electronically
Components enclosed in
airtight, sealed case for
protection
p. 214 Fig. 6-6 Next
11. Hard Disks
What is a head crash?
Occurs when read/write head touches platter surface
Spinning creates cushion of air that floats read/write head above
platter
Clearance between head and platter is approximately two-millionths of an inch
A smoke particle, dust particle, or human hair could render drive unusable
clearance
read/write head
platter
hair
dust
smoke
p. 217 Fig. 6-10 Next
12. Hard Disks
What are external hard disks and removable hard disks?
External hard disk—freestanding
hard disk that connects to system unit
Removable hard disk—hard disk
that you insert and remove
from hard disk drive
p. 217 Fig. 6-11 Next
13. Push the button to
slide out the tray.
Insert the disc,
label side up.
Push the same button
to close the tray.
CDs and DVDs
What are CDs and DVDs?
Flat, round, portable
metal discs made of
metal, plastic, and
lacquer
Can be read only or
read/write
Most PCs include CD
or DVD drive, most
play audio CDs
p. 219 Fig. 6-13 Next
14. CDs and DVDs
Disk Format Read Writ
e
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,
X X
DVD+R
DVD-RW
DVD+RW
DVD+RAM
X X X
15. Miniature Mobile Storage Media
What is miniature mobile storage media?
Storage for small mobile devices
CompactFlash Smart Media
Secure Digital
xD Picture Card
Memory Stick Microdrive
Click to view Web Link,
click Chapter 6, Click Web Link
from left navigation,
then click Flash Memory Cards
below Chapter 6
p. 225 Fig. 6-22 Next
16. Miniature Mobile Storage Media
What is a USB flash drive?
Sometimes called a keychain
drive
Plugs into a USB port on a
computer or portable device
p. 226 Fig. 6-24 Next
17. Miniature Mobile Storage Media
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
18. Microfilm and Microfiche
What are microfilm and microfiche?
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ddooccuummeennttss oonn rroollll oorr sshheeeett ooff ffiillmm
IImmaaggeess rreeccoorrddeedd uussiinngg
ccoommppuutteerr oouuttppuutt mmiiccrrooffiillmm rreeccoorrddeerr
p. 228 Fig. 6-26 Next
19. Microfilm and Microfiche
How do life expectancies of various media compare?
Microfilm and microfiche have longest life of any storage media
Media Life Expectancies
Media Type Guaranteed Life Potential Life
Expectancy Expectancy
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
p. 228 Fig. 6-27 Next
20. 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?
21. Should recording or movie companies be able to use
formatting techniques to keep people from copying
CDs or DVDs?
22. 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?
23. 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?
24. Read article
Is it ethical for technology companies to locate in small
towns?
