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Unit 2 - Topic 1:Understand information (1.2 Types of storage media (Hard…
Unit 2 - Topic 1:Understand information
1.1 Holders of information
Charities:
Red Cross-An example of information held by them would be Gift aid for UK taxpayers.
Individual citizens:
You-An example of information held by you would be your passwords
Businesses:
Tesco-An example of information held by them would be clubcard points.
Healthcare:
NHS- An example of information held by them would be your Blood type.
Government:
An example of information held by the government is your national insurance number.
1.2 Types of storage media
Hard disk/External hard disk:
Advantage:Large capacity and easily replaced.
Disadvantage:Heavy power consumption.
SD card:
Advantage:They are not affected by magnetic fields.
Disadvantage:There is a finite amount of information that can be erased and written to an SD card.
CD-ROM:
Advantage:Very cheap to produce.
Disadvantage:Data can only be written once.
Magnetic tape:
Advantage:Cheapest form of storage per megabyte.
Disadvantage:Serial access so can be quite slow to access data.
CD-RW:
Advantage:Small and portable.
Disadvantage:Easy to scratch or snap
DVD:
Advantage:They are relatively cheap.
Disadvantage:They can be easily damaged.
USB flash memory:
Advantage:Offers very fast access to data and programs.
Disadvantage:It has a limited number of read/write cycles which limits its useful life.
Paper:
Advantages:Easy to access and understand.
Disadvantages:It has become outdated.
S
torage capacity
C
ost
R
obustness
A
ccess to data
M
utability
M
agnetic media
O
ptical media
P
aper
S
olid state media
1.3 Types of info access and storage devices
Portable:
Advantages:Good for brief usage. Portable.
Disadvantage:Lower specs than a desktop device but cost more.
Fixed:
Advantage:Often have more powerful features.
Disadvantage:Needs to constantly plugged in to work.
Handheld:
Advantage:More portable than fixed devices.
Disadvantages:Smaller screens and keyboards.
Shared:
Advantage:Makes file sharing easier.
Disadvantage:Has a bigger security risk.
1.4 Internet access
Copper coaxial cable
Widely used in televisions or connected to a transmitter to an antenna.
Twister pair
Twisted-pair cable used for carrying signals, typically Ethernet.
Fibre optic cable
Widely used in Lighting, cable television, telephones.
1.5 WWW Technologies
Extranet
A website that provides restricted access to resources for an authorised set if users from outside the organisation.
Private. Shared access.
Intranet
A network that is not connected to the internet and is only available to those within an organisation.
Private. Closed access.
Internet
Worldwide network of interconnected networks.
Public. Open access.