What are bad sectors? What causes bad sectors?

Let me give you a suggestion, that is, you should not forcibly shut down when you shut down, because the hard disk is mechanical, and the high-speed rotating hard disk will damage the hard disk platter when it suddenly loses power, and it will also become a bad road early, and do not turn on the computer immediately when the light is shut down, so that the hard disk will be damaged early, and it is best to let the hard disk stop at the start-up after a few seconds.

Categories: Computer, Networking, >> Hardware.

Problem description: Why do bad sectors occur.

Resolution: There are two scenarios:

1. Logical bad sectors. It is mostly caused by bad computer habits, or software bugs that cause logical errors in the hard disk. Advanced formatting repair can be performed with formatting software (e.g., PQ, etc.). Not a very serious problem.

2. Physical bad sectors. Not only is it physically damaged, but to put it bluntly, the hard drive is really broken. It is due to the fact that the hard disk is subjected to strong vibrations or magnetic fields during busy work.

Low-level format repairs can be performed with formatting software, but there is a great, very large, huge loss on the hard disk. It is better to pray that this does not happen.

The sector that cannot be corrected means that the sector has been physically damaged at this time, which is a hard bad sector, which cannot be repaired by software, and can only be isolated by the following methods to not affect the use of other sectors of the hard disk

Software required: DiskGenius

Method: 1) Open the DiskGenius software, click on the hard disk menu, and select the desired hard disk for bad sector scanning and repair options, as shown below.

2) Click Start Detection, and when the detection is detected, click Save Report. The saved report is in txt format, open it with a notepad, you can see the "cylinder number" of the bad track, 3) adjust the cylinder number of the actual partition according to the cylinder number of the bad track in the report file! The method is to right-click on the partition, adjust the parameters of the first song area, and then save it.

4) As shown in the figure below, there should be a gap between partitions after adjustment, and this gray interval is actually the location where the bad sector is located, so don't partition this location again. The preceding steps can complete the isolation of bad sectors.

In addition to the quality of the hard disk itself and the aging of the hard disk, the bad sectors of the hard disk are largely caused by improper use. Hard disk bad sectors can be divided into two kinds according to their nature, logical bad sectors and physical bad sectors, simply put, logical bad sectors are caused by some software or improper use, this kind of bad sectors can be repaired by software, and physical bad sectors are problems with the magnetic medium of the hard disk platter itself, such as physical damage to the platter, this kind of fault is usually not repaired by software.

If your hard drive has any of the following phenomena, you should pay attention to whether the hard drive has developed bad sectors:

1) When reading a file or running a program, the hard disk repeatedly reads the disk and makes an error, prompting information such as file corruption, or it takes a long time to succeed; Sometimes there is even a blue screen, etc.;

2) The sound of the hard disk suddenly changed from the normal friction sound to a strange sound;

3) The system cannot start normally when virus infection is ruled out, and prompts such as "sector not found" or "general error in reading drive c" appear;

4) information on the hard disk, to a certain progress stopped, the last error is reported, can not be completed;

5) Every time the system is turned on, it will automatically run scandisk to scan for disk errors;

6) When executing fdisk on the hard disk, it will repeatedly advance and retreat to a certain progress;

7) The system cannot be booted through the hard disk during boot, and it can be turned to the hard disk letter after booting with a floppy disk, but it cannot be entered, and the system can not be successfully transmitted with sys commands. In this case, it is very likely that there is a problem with the boot sector of the hard drive.

Hard drive bad sectors can be said to be a fatal failure of a hard drive. After the occurrence of bad sectors of the hard disk, the hard disk often represents the end of the life of the hard disk, and the hard disk is not only unavailable for some bad sectors after the occurrence of bad sectors, but also directly affects other available disk sectors, so that the life of the hard disk will not be too long, and it can no longer be used after a long time, resulting in damage to the entire hard disk. The hard disk has a bad sector, which means that it is not safe to store data, and the hard disk can be bought again if it is broken, but where to buy the data in it if it is lost?

Therefore, we need to be aware of the bad sectors of hard drives.

There are two types of hard disk bad sectors: "logical bad sectors" and "physical bad sectors". "Logical bad sectors" can generally be repaired with software; "Physical bad sectors" indicate that the hard disk track has been physically damaged.

Don't want jargon? Let me think about it

Hard drives are stored in "clusters" (understand?). In other words, a large house is divided into many small compartments to access things, just like a small compartment to go to the supermarket to access things. This small lattice may be damaged by man, such as if you find an iron rod to smash it, or it may be damaged by using it for too long and you don't maintain it!

Do you understand this? ）

This damage to a small cell rather than the entire hard drive is simply called "bad sector".

From the above explanation, we can know that there are two kinds of damage: one is physical, just like you smash it with an iron rod, and it is impossible to repair it by general methods (software methods) (low-level formatting can be repaired)! The other is that the small grid cannot be used because it is not repaired or occupied by something else (you or the system does not know that it has been occupied), such as the small grid is too dirty, such as the small grid is deformed, etc., this damage can be repaired, you can use the "tool" (corresponding software) to repair your small grid and continue to use!

As for the "memory bad zone", I can only say that I am lonely and unheard!

It is normal for a hard disk to have bad sectors, but so many bad sectors must be an operation that has caused a lot of damage to the hard disk during your use. Reasons why hard drives have bad sectors:

Big shocks. Static dust.

Sudden power outage. If these conditions occur, the hard drive is prone to irreparable physical bad sectors.

The distance between the hard disk platter and the head is particularly close, and if the hard disk vibrates when the head moves, it may come into contact with the platter and scratch the disk.

1.The hard drive shuts down abruptly while working. When the hard drive starts to work, it is generally spinning at high speed, and if we suddenly turn off the power halfway, it may cause the head to rub violently against the platter and damage the hard drive.

2.Dust or water. It will affect the heat dissipation of electronic components, causing the temperature of circuit components to rise, resulting in leakage or burnout of components.

Dust can also absorb moisture and corrode the electronic circuits inside the hard drive, causing some inexplicable problems, so although the dust is small, the harm to the hard drive should not be underestimated.

3.Temperature. Temperature also has an impact on the life of a hard drive.

When the hard disk is working, it will generate a certain amount of heat, and there is a heat dissipation problem in use. The temperature should be 20 25, too high or too low will change the clock frequency of the crystal oscillator. Temperature can also cause hard disk circuit components to malfunction, and magnetic media can cause recording errors due to thermal expansion effects.

If the temperature is too low, the moisture in the air will condense on the integrated circuit components, causing a short circuit.

4.If the hard disk is close to a strong magnetic field, such as speakers, speakers, motors, radios, mobile phones, etc., the data recorded by the hard disk is damaged due to magnetization.

5.Frequent reading of the hard disk, the hard disk platter is agingExcessive load.

Not much to say, it means that the disk is broken somewhere, as long as it is not a physical bad sector, it can be repaired, and the physical can only be shielded.

Bad sectors and bad sectors mean the same thing.

Generally:

1. Sudden power failure during the reading and writing of the hard disk.

2. The host is touched or shocked after being powered on.

3. The rated power of the host power supply is too small and the power supply is insufficient.

4. Quality problems.