Chapter 6
Storage
Professor Michael J. Losacco
CIS 1110 – Using Computers
Overview
Chapter
6
List Capacities
Describe Hard Disk Characteristics
Explain Cloud Storage Advantages
Differentiate Between CDs & DVDs
Explain Miniature Storage Use
Identify the Uses for Tape
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Storage
Chapter
6
Holds Data, Instructions, & Information
For Future Use
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Capacity
Chapter
6
Number of Bytes Medium can Hold
Average Fortune 1000 Capacity is 1PB
computerworld.com 3/07
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Volatility
Chapter
6
Storage is Non-volatile
Contents Retained when Power is Off
Device
Reading
Transfer Item from Storage Media to Memory
Writing
Transfer Item from Memory to Storage Media
Media
Physical Material
Stores Data, Instructions, & Information
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Disk References
Chapter
6
A: — Always Primary Floppy Drive
B: — Secondary Floppy If It Exists
C: — Always Primary Hard Drive
D:, E:, F:, Etc. — Next Available Drive
Hard drive
CD-ROM
DVD
USB
Network
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Access Time
Chapter
6
Time to Locate & Read Data on Media
Time to Deliver Data from RAM to CPU
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Hard Disk
Chapter
6
Main Storage for System Unit
Internal
Consists of Several Inflexible Platters
Enclosed in Airtight, Sealed Case
Uses Magnetic Particles to Represent Data
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Hard Disk
Chapter
6
Mechanics
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Hard Disk
Chapter
6
Formatting
Prepares Disk for Reading & Writing
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Hard Disk
Chapter
6
Formatting
Track
Circular Band
Sector
Pie-shaped
Cluster
Group of Sectors
Cylinder
Single Track Through All Platters
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Hard Disk
Chapter
6
Head Crash
Spinning Creates Air Cushion
Floats Read / Write Head Above Platter
Crash
Head Touches Platter Surface
Clearance = Two-millionths of an Inch
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Hard Disk
Chapter
6
External
Freestanding
Removable
Insert & Remove
Miniature
Used to Back Up or Transfer Files
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Cloud
Chapter
6
Internet Service
Provides Storage to Computer Users
Benefits
Access Files From Any Computer
Allow Others to Access Their Files
View Time-critical Data Immediately
Store Offsite Backups
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Cloud
Chapter
6
Examples
Digital Photos
Flickr, Picasa
Digital Videos
YouTube
SocNet Content
Facebook, MySpace
Email
Gmail, Hotmail, Yahoo Mail
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Optical Disk
Chapter
6
Flat, Round, Portable Disc
Made of Metal, Plastic, Lacquer
Stores
Software
Data
Digital Photos
Movies
Music
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Optical Disk
Chapter
6
Mechanics
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Optical Disk
Chapter
6
CD (Compact Disc)
CD-ROM
Cannot Erase or Modify Contents
CD-R (Recordable)
Cannot Erase Contents Once Written
CD-RW (Rewritable)
Can be Erased
Stores About 700 MB
Writing Requires Burner & Software
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Optical Disk
Chapter
6
DVD (Digital Video Disc)
DVD Drive & Software Required
High Capacity CD
Used for Movies, Music, Software
12.5MB per Frame
24 Frames per Second
3+ GB per Movie Compressed
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Optical Disk
Chapter
6
DVD
DVD-ROM
Cannot Erase or Modify Contents
DVD-R & DVD+R
Recordable
DVD-RW, DVD+RW, & DVD-RAM
Rewritable
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Optical Disk
Chapter
6
DVD
Storage
Two Layers of Pits Can be Used
Lower Layer is Semitransparent
Laser Can Read Through it to Upper Layer
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Flash
Chapter
6
Solid State Media
Contain No Moving Parts
Solid State Drive (SSD) Benefits
Faster Access Time
Faster Transfer Rates
Generate Less Heat
Consume Less Power
Last Longer
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Flash
Chapter
6
Types
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Flash
Chapter
6
Uses
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Flash
Chapter
6
USB Drive
Plugs into USB Port
ExpressCard Module
Developed by PCMCIA
Used in Notebooks
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Tape
Chapter
6
Magnetically Coated Plastic Ribbon
Stores Large Amounts of Data
Low Cost
Used for Backup Purposes
Storage
Sequential Access
Reads / Writes Data Consecutively
Similar to Audio Tape
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Other Storage
Chapter
6
Magnetic Stripe Card
Contains Mag Stripe That Stores Data
Smart Card
Stores Data On Microprocessor
Embedded In Card
Prepaid Dollar Amounts
Updated When Card is Used
Healthcare Information
Tracking Information
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Other Storage
Chapter
6
Microfilm
100-215-foot Roll of Film
Microfiche
Small Sheet of Film
Usually 4” x 6”
Store Microscopic Images of Docs
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Media Life Expectancies
Chapter
6
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