Computer handling is sometimes called computer maintenance, is the process of caring the computer and its accessories so that it can perform its work properly. POWER MANAGEMENT.
The process of dealing with power disturbances.
Power disturbances include
- Surge
- Sags/ brownout
- Sparks
- Liquid
- Dust
- Heat
- Magnetism
- Spikes
- SURGE : This is the voltage increase above 110% of the normal voltage
- SAGS/BROWNOUT: This is the power brownout which last just less than a second. It’s caused by power overload.
- SPIKES: This is the power overload which last for fractions of a second. It’s caused starting and stopping of heavy welding and lightening equipments.
- LIQUIDS : liquid tends to cause short- circuiting
- DUST: Dust tends to block flow of electrical signals in a computer system.
- HEAT: Chips in a computer system cannot pass high voltage at very low temperature nor high temperature
- MAGNETISM: Magnet can delete all information in a magnetic disks.
DISK DE FRAGMENTATION: The process of re-arranging files in a disk.
DATA BACKUP: The process of making a copy of your files on other disks.
IMPORTANCE OF DATA BACKUP
- Transferring purpose
- Sharing purpose
- Replacement in case of data loss
DEVICES USED IN DATA BACKUP
DVD
CD
- FLASH DISK
- HARD DISK
- FLOPPY DISK
- MEMORY CHIP
- EXTERNAL HARD DISK
DISK FORMATTING: The process of preparing a disk for future use.
COMPUTER SECURITY
– The process of preventing computer data loss
Security measure for protecting computer data
- Use of password
- Installing Anti — Virus
- Updating software
- Avoiding downloading free games
- Avoid sharing password Shopping on safe website
MALICIOUS PROGRAMS
A VIRUS: Is a program that infect an executable file
EFFECT OF VIRUS
- File function is different way than before
- Maybe only displaying a began massage on the monitor
- Maybe deleting some or all file on the user’s hard drive
- Maybe altering data files.There are two key features of a computer virus.
- The ability to propagate by attaching itself to executable files.
- The virus causes harm only after it has infected an executable file and the executable file is urn.
A WORM: Is a malicious program that copies itself
DIFFERENT BETWEEN WORM AND VIRUS
| VIRUS | WORM | |
| 1) Never copies itself requires human action to propagate | Copies itself automatically | |
| 2) Infects an executable file | Stand- alone program | |
TROJAN HORSE: Is a deceptively labeled program that contains at and that harms the user.
DIFFERENT BETWEEN TROJAN HORSE AND VIRUS
A Trojan horse does not replicate, which distinguishes it from viruses and worms.
EFFECT OF TROJAN HORSE
- Trojan horses allow a hacker to remotely control the victim’s computer.
- Perhaps to collect passwords and credit card number and send them to the hacker.
- Perhaps to launch dervial of service attacks on websites
A LOGIC BOMB:
Is a program that “detonates” when some event occurs. The detonated program might stop working (e.g: go into an infinite loop) crash the computer, release a virus, and delete data files or any of many other harmful possibilities.
A TIME BOMB:
Is a type of logic bomb in which the program detonates when the computer clock reaches some target date.
Some function about the destruction between a virus and a worm is caused by two distinctly different criteria.
- A virus infects an executable file while a worms is a stand — alone program
- Virus requires human action to propagate, while worm propagate automatically.
SPYWARE: This is malicious software that hides on computer without user knowledge.
AD-WARE: This is malicious software that installed onto your computer by internet advertising that allow them to inundate you with pop up messages.
