Two major harms of computer virus to system

Any computer or computer network is infected with a virus. As soon as the time is ripe, the virus will be activated. An activated wrist virus can harm a computer or network system.

The harm of computer viruses can be divided into two aspects, which are harmful to computers and harm to computer networks.

I. The harm of computer disease to microcomputer

The harm of computer viruses to micro-computer is specific virus, common virus to micro-computer hazards are:

(1) Destroy the disk's file allocation table or directory area, so that the user's information on the disk is lost, such as "marijuana" virus to the normal hard disk master boot program to the physical 7th sector, and the 7th area is the hard drive fati. For this kind of damage, sometimes a file is found with the dir command, but the file name is lost in connection with the file's ontology.

(2) Delete the soft, hard drive executable or overwrite file. If the deleted file is a system file, then use this floppy disk to boot the system, the system will not start.

(3) Change the disk allocation, resulting in data writer error. In particular, writing data to a human dos memory parameter area may cause the system to crash.

(4) Modify or destroy the data in the file.

(5) affect the normal execution of the memory resident program.

(6) The marking of false bad clusters on the disk, thereby damaging the relevant program or data.

(7) The virus program itself in the computer system of multiple reproduction. Causes the system's storage space to reduce, causes the normal data or the document cannot be stored.

(8) Change or re-write the volume label of the human disk.

(9) The system is hung up, causing the display or keyboard to be blocked state.

(10) format a specific disk or fan x for an entire disk or disk.

(11) Chuan steals important data about the users.

(12) Generate new files in the system, these files may be visible. It may also be implied.

(13) Delete or overwrite specific sectors of the disk.

(14) Encrypt or decrypt specific files stored in the system by the user.

(15) Change the normal process of the system.

(16) affect the normal display of the screen.

(17) Change file attributes and date of creation.

Two. Computer virus damage to the network system

Computer viruses are far more harmful to the network system than to a single microcomputer, and the common hazards are:

(1) The virus program through the "self-duplication" of the system running other programs, and with the normal running of the system to fight the resources, so that the system paralysis.

(2) The virus program not only violates the computer system being used, but also infringes other computers connected with it through the network system.

(3) Virus programs can lead to computer-controlled air traffic command system failure, so that the satellite, missile out of control, so that automatic production lines to prevent the disorder and the banking system paralysis.

(4) Virus programs can be activated, washed away the system memory of a large number of data, resulting in networking with the computer and users of the program and data suffered losses.

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