What is the harm of the mainstream computer virus

Computer virus is a very small software program, used to spread from one computer to another computer, and interfere with computer operation, together to see what harm the mainstream computer viruses.

The computer virus stimulates, may carry on the destruction activity, the light interference screen display, reduces the computer to run the speed, the heavy person makes the computer soft hard disk file, the data is wantonly tampered or all loses, even causes the entire computer system to be paralyzed.

Common forms of destruction are:

(1) Delete specific executable files or data files on the disk.

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

(3) Create useless new files in the system.

(4) Encrypt or decrypt the files stored by the users in the system.

(5) Destroy the file allocation table.

(6) Changing the storage state of the target information on the disk.

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

(8) Create "bad" sectors on the disk, reduce disk space, and achieve the purpose of destroying the relevant program or data file.

(9) Changing the disk allocation so that data is written to the wrong disk area.

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

(11) The system hangs, causes the display screen or the keyboard blockade state.

(12) affect the normal operation of the memory resident program.

(13) Change the system's normal operation process.

(14) to steal important data about the user.

In short, a virus is a program that can do all the things a program can do.

However, the nature of the computer virus is a program, it can only do what the program can do, not omnipotent, it is impossible to invade the boot of the RAM, it is not possible to infect a "write-protected" floppy disk (unless the floppy disk drive physical failure), can not damage the motherboard, burning power, The virus is not a "scapegoat" for hardware failures and software problems.