Unit 2 - Topic 1:Understand information (1.2 Types of storage media (Hard…
Unit 2 - Topic 1:Understand information
1.1 Holders of information
Red Cross-An example of information held by them would be Gift aid for UK taxpayers.
You-An example of information held by you would be your passwords
Tesco-An example of information held by them would be clubcard points.
NHS- An example of information held by them would be your Blood type.
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.
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.
Advantage:Very cheap to produce.
Disadvantage:Data can only be written once.
Advantage:Cheapest form of storage per megabyte.
Disadvantage:Serial access so can be quite slow to access data.
Advantage:Small and portable.
Disadvantage:Easy to scratch or snap
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.
Advantages:Easy to access and understand.
Disadvantages:It has become outdated.
ccess to data
olid state media
1.3 Types of info access and storage devices
Advantages:Good for brief usage. Portable.
Disadvantage:Lower specs than a desktop device but cost more.
Advantage:Often have more powerful features.
Disadvantage:Needs to constantly plugged in to work.
Advantage:More portable than fixed devices.
Disadvantages:Smaller screens and keyboards.
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.
Twisted-pair cable used for carrying signals, typically Ethernet.
Fibre optic cable
Widely used in Lighting, cable television, telephones.
1.5 WWW Technologies
A website that provides restricted access to resources for an authorised set if users from outside the organisation.
Private. Shared access.
A network that is not connected to the internet and is only available to those within an organisation.
Private. Closed access.
Worldwide network of interconnected networks.
Public. Open access.