Virus/Anti-Virus

*  A virus harm your computer

* An Anti-Virus protects you against newely created viruses.

Compressing a file:
* When you compress a file it takes less space and it can also be transferred to other computer more quickly.

Defragmentation:
* It organises the Hard Disk

Scan Disk:
* It checks your disk from any errors or faults
* It emarginate the faulty sectors so that they are not used anymore.

Formatting a Diskette:
* When you format a disk you divide the disk into areas called tracks and sectors.
* You loose everthing you had  on the thing you had formatted.

Topic 1

Topic 1: The computer System

 

 

Data & Information:

•     Data is numbers that don't mean anything but information is when the data would be put in a structure that we would understand (in abc).

• Data + Structure = Information

Computer:

•       it is a mchine that when programmed it would accept data and then processed into information.
• Input > Process > Output

• In the process we store data

Types of computers:

• Supercomputers -The most powerful computers
• Mainframe computers - Less powerful then supercomputers but they are fast
• Microcomputers - There are Desktop computers and Laptop computers
• PDA (Personal Digital Assistants) - Also known as palmtop computers
• Embedded computers - Contain some form of build in computer

Hardware/ Software:

• Harware - Something we touch and see
• Software - Installed into the computer

 System software/ Application software:

• Application software - Used by people to perform general tasks
• System Software - Programs used by the computer itself for it its internal activity and to  run  application software.

CPU (Central processing unit):

• The brain of the computer
• In the motherboard

Main Memory:

•  RAM (Random Acess Memory) read/write memory
• ROM (Read Only Memory) read memory

Backing storage:

• Storing data outside the main memory

Bus:

• A set of parallel wires connecting two or more components (units) of a computer
• There are 3 :

                 - The address Bus
                -  The data Bus
                - The control Bus
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Thanks that was topic 1. I hope you found this useful and you liked it!!!