1. Storage
Chapter 7

2. Instructional Objectives
Explain what a storage device is
Define the two storage operations
Define what a hard disk is and list the types
Define a solid state drive.
Define what CD’s and DVD’s are.
List ways to properly care for CD’s and DVD’s.
Give examples of miniature storage devices.
Explain what a card reader is
Explain what micro-fiche and film are.

3. Storage Devices
Storage holds data, instructions, and information for future use
Consists of two parts
Storage Device
Storage Media

4. Storage is nonvolatile where as RAM memory is volatile
Two operations associated with storage
Reading - Process of transferring items from storage media to memory
Writing - Process of transferring items from memory to storage media

5. Storage Capactiy
Capacity refers to the number of bytes (characters) a storage media can hold.

6. Storage Capactiy Kilobyte (KB) 1 thousand Megabyte (MB) 1 million
Gigabyte (GB)
1 billion
Terabyte (TB)
1 trillion
Petabyte (PB)
1 quadrillion
Exabyte (EB)
1 quintillion
Zettabyte (ZB)
1 sextillion
Yottabyte (YB)
1 septillion

7. Access Time
Time it takes storage device to locate item on storage medium
Time required to deliver item from memory to processor

8. Access speed as it relates to storage media
Primary Storage
Secondary Storage
Slow
Fast
Items waiting to be interpreted and executed by the processor
Memory (most RAM)
Operating system, application software, user data and information
Hard Disk
Software, backups, movies, music
CDs and DVDs
Digital pictures or small files to be transported
Miniature Storage Media
Backups
Tape
Small files to be transported
Floppy Disk

9. Hard Disks
High-capacity storage consisting of several inflexible, circular platters that store items electronically
Components enclosed in airtight, sealed case for protection

10. Hard Disks – Three Types
Internal
External
Removable

11. Organization of Magnetic Media on Hard Drives
Track A narrow recording band that forms a full circle on disk
Sector
An individual piece of the wedge shaped division of all of the track. Each sector stores 512 bytes of information

12. Solid State Drives
Solid state drives use the same type of memory used in USB drives.
Much faster in accessing information over the standard hard drive
More stable then hard drives
About 4 times more expensive per gig the a standard hard drive.

13. Solid State Drives

14. CD’s DVD’s and Blue Ray
Flat, round, portable metal discs made of metal, plastic, and lacquer

15. Parts of a DVD player
disc label

16. Parts of a DVD player
disc label
laser diode

17. Parts of a DVD player
disc label
prism
laser diode

18. Parts of a DVD player
disc label
lens
prism
laser diode

19. Parts of a DVD player disc label lens prism light- sensing diode
laser diode

20. Parts of a DVD player disc label pit lens prism light- sensing diode
laser diode

21. Parts of a DVD player disc label pit land lens prism
light- sensing diode
laser diode

22. How a DVD Reads Information
Step 1. Laser diode shines a light beam toward disc
disc label
pit
land
lens
prism
light- sensing diode
laser diode

23. How a DVD Reads Information
Step 2. The light passes through the prism and is focused by lens on to the metal layer of the disc.
disc label
pit
land
lens
prism
light- sensing diode
laser diode

24. How a DVD Reads Information
Step 3. If light strikes a land, it is reflected off the prism into the light sensing diode.
disc label
pit
land
lens 1
This represents a 1 in binary
prism
light- sensing diode
laser diode

25. How a DVD Reads Information
Step 4. If light strikes a pit, it is scattered and no light reaches the light sensing diode
disc label
pit
land
lens 1
This represents a 0 in binary
prism
light- sensing diode
laser diode

26. Data Storage on a CD/DVD
single track spirals to edge of disc
disc sectors

27. Proper Care of CD’s and DVD’s
Do not expose the disc to excessive heat or sunlight
Do not eat, smoke, or drink near a disc
Do not touch the underside of the disc
Do not stack discs
Store disc in a jewel box when not in use
Hold disc by its edges

28. Miniature Mobile Storage Media
Compact Flash
Smart Media
Secure Digital
Memory Stick
Microdrive
xD Picture Card

29. Card Readers
And externals device that reads information stored on miniature mobile storage media

30. PC Cards Credit-card-sized device commonly used in notebook computers
Adds capabilities to computer
Category Thickness Use
Type I 3.3 mm RAM, SRAM, flash memory
Type II 5.0 mm Modem, LAN, SCSI, sound, TV turner, hard disk, or other storage
Type III 10.5 mm Rotating storage such as a hard disk

31. Smart Cards Stores data on microprocessor embedded in small card
Input, process, output, and storage capabilities

32. Microfilm and Microfiche
Store microscopic images of documents on a roll or a sheet of film
Images recorded using a computer output microfilm (COM) recorder

33. Life Expectancies of Various Storage Media
Media Type Guaranteed Potential
Life Life
Expectancy Expectancy
Magnetic Disks 3 to 5 Years 20 to 30 years
CD’s and DVD’s 5 to 10 Years 50 to 100 years
Microfilm years years