1. 3 - STORAGE: CHOICE OF STORAGE MEDIA/DEVICE

2. Thought for the day - Storage
How many GB would your brain be if it was computer storage???

3. Big Picture - Storage In this topic, you need to understand:
the need for secondary storage
common types of storage: optical, magnetic, solid state and their characteristics - capacity, speed, portability, durability, reliability, cost
the advantages and disadvantages of these storage methods
suitable storage devices and storage media for a given application based on their characteristics
data capacity and calculation of data capacity requirements

4. Learning Objectives By the end of today’s lesson, you will be able to:
Be able to recommend a storage device for a situation based on its characteristics and their advantages/disadvantages

5. Starter – think back to last week
Unscramble the anagrams and then say what sort of storage they are – Optical, Magnetic or Solid State
Kid Fly Pops
Advised Tile Sort
Var Red Hid
Bay Rule
Menace Tag Pit
Dear Cry Mom
Verb Used Pin
1 FLOPPY DISK
2 SOLID STATE DRIVE
3 HARD DRIVE
4 BLUE RAY
5 MAGENTIC TAPE
6 MEMORY CARD
7 USB PEN DRIVE

6. Key Characteristics
Can you remember the 6 characteristics of storage devices you need to consider:
D……………
R……………
P……………
C……………
S……………
We’re going to use these to decide which type to recommend......and why. The why is as important as the what.

7. Key Characteristics Durability Reliability Portability Capacity Speed
Can you remember the 6 charactersitcs of storage devices you need to consider:
Durability
Reliability
Portability
Capacity
Speed
Cost
We’re going to use these to decide which type to recommend......and why. The why is as important as the what.

8. Draw each category (using a rule
Draw each category (using a rule!) Place the storage media onto the correct place on each line to show their relative speeds, costs and capacities .
SDD Optical disc Magnetic Tape Memory Card HDD
SLOWEST
READ/WRITE SPEED
FASTEST
CHEAPEST
COST PER GB
PRICIEST
LOWEST
CAPACITY
HIGHEST

9. Choosing storage devices
How do you decide which storage device to buy?
Do you own one? Why did you choose that one?
What do you think?
I’m going to get a magnetic tape to back up my laptop and external hard drive
SSD are better than HDD
A CD ROM is better than a USB Memory Stick.

10. Scenario 1
A graphics designer needs to store their creations (images, sound and video). They work mainly from home, but like to take their work to events and meetings. What characteristics do they need from the storage device? What do you recommend? Why?
Durability
Reliability
Portability
Capacity
Speed
Cost
Large capacity
Portability
Durability
Reliability

11. Scenario 2
The Managing Director of a small accountancy firm stores data about the company’s clients and their accounts. The Managing Director only works at the office. What characteristics do they need from the storage device? What do you recommend? Why?
Durability
Reliability
Portability
Capacity
Speed
Cost
Small capacity
Reliability
Fast access

12. What to do now Log into Moodle Go to ICT & Computing
Durability
Reliability
Portability
Capacity
Speed
Cost
Log into Moodle
Go to ICT & Computing
GCSE Computer Science
Computer Systems
1.3 - Storage
iBytes 3.2 Characteristics and Choice of Storage
Download, save and then complete the work sheet
Storage_L2_Choice_of_Storage.docx
1.For each of the scenarios on the worksheet:
Identify the most appropriate type of storage
Justify (explain) your choice using the characteristics – do not use the internet, there is no need!
2.Investigate cloud storage

13. Answers A student needs to bring their homework into school
Scenario
Type of Storage
Justification
A student needs to bring their homework into school
 Solid state
e.g.
Portable – for carrying to and from school
Durable – can be knocked around in bags and not break
Fairly reliable – unlikely to get scratch like optical
A media student needs to store a video they have made to distribute to their friends
Optical/Solid state 
 e.g. (for optical)
Capacity - Only 1 video needs saving and this will be sufficient
Portability – can be transported, so given to other people
Durability – is poor, but it does not need to be moved a lot, only once to another person
Cost – this is low and as the device is to be given away this is more beneficial
A software developer has created a trial version of their software that will be given away in magazine
 Optical
Cost – to be given away, so low cost needed
Portability – small enough to be put in magazine, can be moved
Durability – will need protecting in magazine
Capacity – sufficient for software
A school needs to back-up its data every evening
 Magnetic
e.g. (for magnetic) Tape Drive or Large HDDs
Capacity – large so can hold all types of data
Speed – relatively fast, so backup will not take a long time
Portability – does not need to be moved
Reliability – fairly reliable type so backup is unlikely to be lost
Cost – low per GB

14. Answers
A large corporation needs to store data about its customers, stock and orders
Magnetic/SS 
 e.g. (for magnetic)
Capacity – large so can hold all the data
Speed – relatively fast, so data can be found and retrieved quickly
Portability – does not need to be moved
Reliability – fairly reliable to data will not be lost
Cost – low per GB and a large capacity will be needed
A web server needs to store a multimedia website for web-users to access
 Magnetic/SS
e.g. (for magnetic)
Capacity – large so can hold range of multimedia
Speed – relatively fast, so server requests will be within a reasonable time
Reliability – fairly reliable type so ca be accessed many times
Cost – low per GB

15. Plenary Questions What is secondary storage?
Why do we need secondary storage?
What are the 3 types of storage?
What type of storage is a USB memory stick?
What type of storage is a CDROM?
What type of storage is a HDD?
What type of storage is the fastest to read data from?
What type of storage is the most expensive per GB?
What type of storage is the most reliable?
What type of storage is the least durable?

16.
Today’s objectives:
Estimate storage requirements &most appropriate storage
Estimate data capacity requirements for different file types