![]() One is that hard disk manufacturers will perform low-level format to disk before it leaves the factory. The other is that when hard disk has bad sectors, performing low-level format to it can reduce spreading speed of bad sectors or shield bad sectors. In the first case, we don't need to describe in details, because HDD low-level format before it leaves factory only comes into contact with disk engineers. For average users, there is no need to consider this matter. In the second case, what type of bed sectors need low-level format? Let's take a look at types of hard disk bad sectors before describing this critical question. In general, bad sectors are divided into physical bad sectors and logical bad sectors. Logical bad sectors are easier to deal with than physical bad sectors. It refers to that hard disk is interfered when data are written in it. From the perspective of process, it refers to when data are written in hard disk, it will use ECC logic to re-combine data. Generally, 512 bytes need to be written in OS. But actually, additional dozens of bytes will be written in hard disk. And all these bytes will be verified and encoded by using ECC. ![]() If ECC correction code calculated by original bytes is different from that calculated by read-out bytes, this will cause ECC error. This is called the cause of logical bad sectors. The CHKDSK command is able to check the disk surface for bad sectors and mark them. ![]() But what if CHKDSK deletes your important data? You are advised to use MiniTool Power Data Recovery to recover data after CHKDSK.įor physical bad sectors, it has catastrophic damage to hard drive. It can be divided into internal and external physical bad sectors. Physical damage of hard disk surface belongs to external physical bad sectors. This can't be repaired.īut when outside influence causes data writing error, OS will judge this as physical bad sector. Physical bad sectors can be repaired with hard disk tools ( hard disk check and repair software provided by disk manufacturers). Low level format tool windows 10 software# ![]()
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