Home > What are Sectors?

The disk is divided into tracks and sectors. A sector that cannot be used due to a physical flaw on the disk is called a bad sector. Boot sector viruses can be used to infect code for master boot record of a PC. The master boot record is a small program that runs every time the computer starts up.

The master boot record generally resides on the first sector of the hard disk. Boot sector viruses are typically very difficult to remove, as most antivirus programs cannot clean the MBR while Windows is running. Some common boot sector viruses include Monkey and Form. A boot sector virus can cause a variety of boot or data retrieval problems. Boot sector viruses are usually spread by infected floppy disks.

In the past, these were usually bootable disks, but this is no longer the case. A floppy disk does not need to be bootable to transmit a boot virus. Any disk can cause infection if it is in the drive when the computer boots up or shuts down. The virus can also be spread across networks from file downloads and from email file attachments.

In most cases, write enabled floppies can infect PC and pick up the boot sector virus. The best protection against boot sector viruses is same as against viruses in general: a good antivirus program with up-to-date virus definitions. A computer virus behaves in a way similar to a biological virus, which spreads by inserting itself into living cells. Viruses are one of the several types of malware or malicious software. In common parlance, the term virus is often extended to refer to computer worms and other sorts of malware.

While viruses can be intentionally destructive (for example, by destroying data), many other viruses are fairly benign or merely annoying. Some viruses have a delayed payload, which is sometimes called a bomb. For example, a virus might display a message on a specific day or wait until it has infected a certain number of hosts. A time bomb occurs during a particular date or time, and a logic bomb occurs when the user of a computer takes an action that triggers the bomb.

However, the predominant negative effect of viruses is their uncontrolled self-reproduction, which wastes or overwhelms computer resources. This can confuse computer users, since viruses in the narrow sense of the word are less common than they used to be, compared to other forms of malware such as worms. This confusion can have serious consequences, because it may lead to a focus on preventing one genre of malware over another, potentially leaving computers vulnerable to future damage.

The viruses can be destructive many other viruses are merely annoying. Some viruses have a delayed payload, which is sometimes called a bomb. For example, a virus might display a message on a specific day or wait until it has infected a certain number of hosts. The sectors can be used to store data and when these sectors are affected by the viruses causes the data to be corrupted. Thus, the backup is the only answer to the question in order to avoid the damage of the harmful viruses.

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