1, The logical bad sectors: commonly known as “soft bad sectors.” Which is caused by software installation or error usage，generally it does not harm the hard disk much.
2, Physical bad sectors: the gap between head and disk is only 0.015 ~ 0.025 μm, if hard drives get a strong jolt in such small space when transited, it will make physical sectors damaged. In addition, human error also make a hard scrap. Some careless person does not tight the screws of hard disk when install the computer, it also buried potential problems for the future. vibration can also cause physical bad sectors when hard disk working.
3, Zero-track failure: As everyone knows, the hard disk drive access is from 0 track. If the 0 track is damaged, hard drive will can not read the disk, the boot can not find the hard disk and so on.
The above commonly regarded as three kinds of hard drives symptoms. Usually logical bad sectors are very easy to solve, using Windows ScanDisk can resolve it. If you can not “sweep the disease”, FORMAT the hard disk, reinstll the system can solve the problem, but for the physical bad sectors and zero-track failures, we have to spend some time and effort.
