(Test Review: Thursday @ 7:30PM)
● Buy hardware and IT employees staff and do it themselves
● .Employ an off-site mass storage company
● .Port their storage into the Cloud
.What are the advantages and/or disadvantages of any solution?
Computer Storage:
The variety of ways a computer system stores (saves) data and information which includes:
● Spreadsheets
● Documents
● Graphics
Which city has the most mass storage in the country? :Phoenix (Phoenix has no natural
disasters.)
Filing Cabinet Storage:
A steel box, organized with drawers, folders in the drawers, legal contracts in the folders,
organized in alphabetical order (secondary storage).
To work on a legal contract, find it in the filing cabinet (secondary storage) and put it on your
desk (primary storage). Make the desired changes on the contract and put in back in the
appropriate place (saving) in the filing cabinet.
In a computer system, a filing cabinet is a hard drive, cloud drive, SSD or an optical disc, with
advantages and disadvantages
.•What if the filing cabinet burns down?
•What if I want a copy of a file in the filing cabinet?
•What if I want to send a file to someone else?
Why is a computer binary? Because it is electric
Secondary Storage
•Filing Cabinet
•Non-volatile•
Retains information even with the computer turned off.
•Not directly accessible by the CPU
Business Network Options:
A Financial Services Business (FSB) with 1,500 employees has massive data storage needs.
Which option is best?
•Must make use of input/output channels.
•Slower than primary storage.
•Typically higher capacity than primary storage.
How can you guarantee that information is removed from a hard drive?
Primary Storage, Random Access Memory (RAM)
•Volatile (does not retain information when off)
•No physical movement
•Accessed in any order (speed)
Ones and Zeros
•Computers are binary, made up of two parts
•Two Parts: Positive or Negative charges on a hard drive
•Charges are represented by ones and zeros.
•Any file on a computer is converted to ones and zeros.
● Input devices (like keyboards, webcams and microphones) translate what a human
understands to ones and zeros for the computer system to use
● .Output devices (like computer monitors and printers) translate ones and zeros to what a
human understands.
A “One” is a bit. A “Zero” is a bit
- When 8 bits are combined they become a “byte”. Bytes can be used to represent
characters: 01000001 =“A”
Physical Storage Characteristics
•Requires a read/write head
•Typically spinning media
•Records (write) data and information
•Accesses (read) data and information
•Electromagnetic, holds positive and negative charges
•Like a record player
•Concentric circular band around the disk is a track
•Divided into pie shapes called sectors
•More than one sector comprises a cluster
•Table of contents is “FAT” or “NTFS”If the Internet is fast, why not connect to a hard drive
somewhere else besides your local hard drive? (Cloud Drive)
Characteristics of Storage MediaMediaCapacity
*Floppy Disk1.44 Mg
Hard Drive / SSD40 GB – 60 Terabytes
Flash Memory256 – 2 Terabytes
Digital Versatile Disk15 GB – 30 GB
Blu Ray25 GB – 30 GB
Magnetic Tape Unlimited
RAIDUnlimitediDrive (pre Cloud)UnlimitedMass StorageUnlimitedCloud
StorageUnlimited*Capacities are for reference only
Which industry decided to use blu ray instead of dvd: Porn
Advantages/Disadvantages of buying storage:
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