In order to properly protect against viruses, it's helpful to know what they do and how they look. It is known that they want to spread, infect files, ... They provide load.
Viruses: the different types
* Species in a row with short explanation
* Macro Virus
* Virus Software
* Boot Sector Virus
* Trojan horse
* Viruses in general
Species in a row with short explanation
Very dangerous:
* Trojans pose as a good program, but can be damaging.
* Stealth viruses hide the damage, until they are removed, the issue is.
* Boot sector viruses are on a boot disk, when booting with the floppy, the virus is active.
* Software, software viruses infect course, if the program is opened, the virus does that.
* Hybrid viruses use several techniques to attack your computer.
Dangerous:
* Macro viruses infect eg Word and Excel files by scrambling the letters.
* Tunneling viruses use a technique to have to attack the anti-virus program notes.
* Eg sparse infectors are active only Friday the thirteenth, so the attention of the virus to escape.
* Encrypt viruses can encode and decode hiding to infect.
* Retroviruses infect the anti-virus software so it can not boot or the virus itself can not recognize.
* Polymorphic viruses constantly change their shapes to resemble an ordinary file.
Just load:
* Virus hoaxes are false reports and is usually found in chain letters.
* Worms can spread very fast, it constantly tries to copy.
Macro Virus
This virus infects Microsoft Office documents and can easily spread to other documents. Some viruses spread through Outlook Express, the popular e-mail program from Microsoft, without the user being aware of it. In another e-mail programs like Eudora, Netscape Messenger, Mozilla Tunderbird ... viruses can not spread. A macro virus is written in Visual Basic, the scripting language for macros of Microsoft Office. Normal macros are not viruses, but it is possible to make it harmful.
Virus Software
This virus will front a nesting program. If we then start the program, the virus is active first. It then has time to infect other programs. They are very dangerous because the virus is not directly over the program and scan the damage already inflicted before he is discovered. You should be very careful with freeware, some programmers deliberately infect their software.
Boot Sector Virus
Boot sector viruses install themselves on boot disks. If the computer is booted with the floppy, which normally takes the computer and "give the orders" to correctly start. If the boot floppy is infected, the virus-free game. It copies itself to the boot sector of the hard disk. The boot sector of hard disk allow the computer startup and contains information on what should be loaded, the file structure ...
If the virus still has free play, changing the BIOS. Thus, in that only the hard disk may be initiated: you can not boot disk. The virus will only be launched by the operating system and so could not help it. Fortunately there are now virtually no floppies, let alone boot disks, using the virus making it rare. Why opstartcd-ROM is no risk? These should only danger as writable CD-ROM and you would use it in a CD-RW drive. Because the CD-ROM must nevertheless somehow become infected.
Trojan horse
Trojan Horses or Trojans are very dangerous programs: they look like innocent programs, screen savers or updates but if you install them, do what they want. They can modify or delete the file structure and ports * opened. Most Trojan horses do first: they damage files and software, but they did not copy (this is exceptional). There are also backdoor Trojans. They do no damage but are able to open doors *. Then someone manage your computer completely
* What are ports? A computer is connected to other devices through ports. Eg. the Internet, the device is a server. If you surf you are a customer who goes shopping: a client and a server. Usually servers may be viewed by clients.
Data recovery is the reconstruction of data that is on a crashed hard drive. There are software programs on the market that you can try to retrieve data from a disk, called software recovery programs. For this it is necessary that the mechanical hard disk still functioneerd. Has a real hard drive crash and it runs no more than you are at the mercy of hard disk recovery companies.
How does one actually drive?
The hard disk of a computer consists of a round or more hard disks, this disk is a very thin layer can be applied which magnetized, these discs are in a sealed enclosure. Each disk is divided into smaller parts being the sectors. On either side of the disk is a read / write head which is very fast about the rapidly spinning hard drive can move data and sector can make or read the disk. The disk rotates more than 10,000 revolutions per minute, the read / write head is located only a few microns of the disk, the head drive will not touch the high speed does an air layer, the head of the disk, as at a hoovercraft. At the closing of a hard disk drive will stop spinning, now it will air layer between the head and drive away to avoid the head on the disk folds this into so-called landing ring put, this is an unused ring hard drive.
How can a mechanical hard drive will crash?
It is not hard to imagine, if you know the disks with more than 10,000 rpm spin above and below the disk read / write head to a few microns away, then you can imagine what happens when during a working with the computer plug in once from it, or leave your laptop on the floor, then the thunder heads on the disk and wipe off all the magnetic data or even damage the drive. This is a mechanical crash, this is basically worse than a software crash, those with special software can still be overcome. In a crash, mechanical repair much more expensive and difficult.
Create a software hard drive crash, and now?
In principle, all entered data on a hard disk, if they do not actually overwritten. There is software available which can find those dates. In this way, lost photos or data files never lost even when an image file is not completely dispose of the hard disk. By then the right data recovery software you can use these files always terughalen.Voorbeeld such a program is Filescavenger.
Mechanical hard disk crash, and now?
Can you hear the hard drive was humming with activated computer, you get a report of unreadable disk? then you are worse off. Then you hard disk over to Hard disk recovery service companies called Biggest disadvantage is the price, think of an average price of around 900, - a hard drive. This data recovery companies have in fact very expensive techniques to data from a hard drive to get, first they must have a special dust-free area where they cover the hard drive to open, then they'll sector after sector of the damaged disc manually try to clone, so as to another hard disk to reproduce the data. With today's hard drives of large terra bites you can imagine that this is a very intensive job is hence the price.
Can you avoid a crash?
No, actually not all that long time hard around turns and in one way or another mechanical nich works will once fail, you can still prevent your data recovery need, make regular backups of your important files, this can often with software on your computer, some antivirus programs offer this option already, or create a clone of your hard disk to an external hard drive and set it aside. Treat your PC and drive carefully and check the proper functioning of the operating system offered by the utilities.
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