Zhongcheng Tianhe Data Recovery Center decrypts the impact of low-level formatting operations on hard drives
What do common low-profile software do to hard drives?
â‘ Sector clear, rewrite check value
After the hard disk is low, all bytes of each sector are set to zero, and the check value of the sector is restored to the original value, so as to correct some errors. For example, when the hard disk has an ECC error, it can be repaired.
(Beijing Zhongcheng Tianhe Data Recovery Center)
â‘¡ Rewrite sector identification information
Early low-profile tools will rewrite the identification information of each sector when low-format hard drives, while retaining some of the information of the track, of course, this only applies to the old hard drive, for the new model hard drive that has now undergone a major change in structure And, if you use those old low-level tools, it will only damage the hard disk. So many people are saying "low-format hard drives are dangerous", but they have not chosen the right software.
â‘¢Check the sector read and write, replace the defective sector
The low-level tool will check the reading and writing of each sector, and if there is a problem, replace the sector and repair it.
â‘£Renumber all physical sectors
The low-level software reassigns the identification information for each sector according to the records in the P-list and the allocation parameters of the sectors to hide the bad sectors.
⑤ Renumber the tracks and write relevant information
The software will rewrite the servo information of each track of the hard disk and renumber the tracks. The ultimate purpose is also to prevent users from accessing the hidden bad tracks.
â‘¥ Modify specific parameters, such as status parameters
Some hard disks have a parameter to record whether the low-format process ends normally. If the low-profile format ends abnormally, the hard disk will refuse to read and write operations.
Some low-level tools
1.DM: The operation of â‘ and â‘¡ is fast, and the hard disk is generally not damaged, and the repair effect is also not strong.
2.Lformat: Perform the operations of â‘ , â‘¡ and â‘¢, the operation speed is slow, and some errors can be repaired.
3. Low-level tool of SCSI card: The operation of â‘ , â‘¡, â‘¢, â‘£, â‘¥ has obvious effect on repair of some SCSI hard disks.
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