Secondary Storage

GCSE Computing

Objectives…

• Understand the need for input and output devices.

• Describe suitable input devices for a wide range of computer controlled situations.

• Describe suitable output devices for a wide range of computer controlled situations.

• Discuss input and output devices for users with specific needs

INPUT OUTPUT

KEYBOARD MONITOR

MOUSE PRINTER

SENSORS (LIGHT, TEMP etc.)

GRAPH PLOTTER

TOUCH SCREEN MICROPHONE

SPEAKERS GRAPHICS TABLET

Secondary Storage

• All desktop computers and most other computer devices need some secondary storage to store the following items:

• The operating system. • Any programs and applications that the user

installs onto the computer. • Any files and documents containing the user’s

data.

Secondary Storage

• These cannot be stored in the primary memory.

• If they were stored in the ROM, they will not be alterable which means the user will not be able to install any programs or modify any files.

• If they were stored in the RAM, they will be lost every time the computer is switched off.

Secondary Storage

• When something is to be used, it needs to first be transfered from the secondary storage to the primary memory.

• This is called ‘loading’ and it is the reason why we say that we are loading a program or loading a file.

Secondary Storage

• Magnetic devices• Optical devices• Solid State/Flash devices

• What are they?• How much do they hold?• What can they be used for?• Advantages/Disadvantages?

Secondary Storage

Secondary Storage

Secondary Storage