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Professor Michael J. LosaccoCIS 1150 – Introduction to Computer Information Systems
Secondary StorageChapter 7
Chapter
7
2/19
Overview
Discuss Secondary Storage Characteristics
Describe Hard Drive Parts
Compare Internal And External Hard Drives
Discuss Performance Enhancements
Define Optical Storage
Define Solid-state Storage
Define Cloud Storage And Cloud Services
Discuss Mass Storage
Chapter
7
3/19
Storage
Primary Storage
Volatile
Temporary
e.g., RAM
Secondary Storage
Nonvolatile
Permanent
Chapter
7
4/19
Storage
Secondary Storage Characteristics
Media
Physical Material that Holds Data and Programs
Devices
Read or Write to or from Media
Access Speed
Time Required to Read Data and Programs
Chapter
7
5/19
Storage
Secondary Storage Characteristics
Capacity
Chapter
7
6/19
Storage
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
Chapter
7
7/19
Hard Disks
Main Storage for System Unit
Stores Data Using Magnetic Charges
Positive / Negative Charges Represent Bits
Sealed in Airtight Case
Media
Rigid Metallic Platter
Chapter
7
8/19
Hard Disks
Platter
Tracks
Rings of Concentric Circles
Sector
Wedge-shaped Sections
Cylinder
Vertically Passes Through Stack of Platters
Chapter
7
9/19
Hard Disks
Head Crash
Spinning Creates Air Cushion
Floats Read / Write Head Above Platter
Crash
Head Contacts Surface
Clearance = 0.000001”
Chapter
7
10/19
Hard Disks
Internal
OS
Major Applications
External
Connect Via USB
Protect or Secure Sensitive Information
Back Up Internal Hard Disk Contents
Providing Additional Hard Disk Capacity
Chapter
7
11/19
Hard Disks
Performance Enhancements
Disk Caching
Performed During Idle Processing Time
Frequently Used Data Read into RAM Cache
RAID (Redundant Arrays of Independent Disks)
Several Hard Disks Treated as a Large-capacity Drive
Fast Access Speed
High Reliability
File Compression
Reduce Space Required to Store Data and Programs
Chapter
7
12/19
Optical Discs
Laser and Reflected Light Represent Data
Mechanics
Chapter
7
13/19
Optical Discs
CD (Compact Disc)
DVD (Digital Video Disc)
BD (Blu-ray Disc)
Formats
-ROM
-R
-RW, -RE
Chapter
7
14/19
Optical Discs
Storage
CD
700MB
DVD / BD
Two Sides Can be Used
Two Layers of Pits Can be Used
Lower Layer is Semitransparent
Chapter
7
15/19
Solid-State Storage
Solid–state drives (SSDs)
No Moving Parts, Fast, Durable
Flash Memory Cards
USB Drives (or Flash Drives)
Connect to USB Port
Chapter
7
16/19
Cloud Computing
Internet Service
Provides Storage to Computer Users
BenefitsAccess Files From Any Computer
Allow Others to Access Their Files
Store Offsite Backups
Google Apps
Dropbox
Office 365
Chapter
7
17/19
Mass Storage Devices
Enterprise Storage System
File Servers
Networked Attached Storage (NAS)
RAID Systems
Tape Libraries
Organizational Cloud Storage
Chapter
7
18/19
Mass Storage Devices
Storage Area Network (SAN)
Architecture to Link to Remote Storage
User’s Computer Provides File System
SAN Provides Disk Space
Requires
High-speed Network
Special File System
Chapter
7
19/19
Careers in IT
Disaster Recovery Specialist
Recovering Systems and Data After a Disaster
Create Plans to Prevent / Prepare For Disasters
Bachelor's Degree in Computer Science
Skills in Networking, Security, and Database Administration
Good Communication Skills
Able to Handle High-stress Situations
Annual Salary of $70,000 - $103,000