[Fault category]
(1) Fault type: the hard disk firmware area is damaged
(2) Typical characteristics:
1. The hard disk seeks normally but cannot identify itself correctly Model or capacity
2. The hard disk can recognize its model and capacity normally but cannot be read.
(3) Damage degree star rating: ★★★
[Solution] < br>(1) Recovery process
1. Detection process:
(1) Supply power to the hard disk, connect the hard disk to the device for further testing after the seek is normal;
(2) Check whether the device can be correctly identified The model or capacity of the hard disk;
(3) Rely on the device to identify whether the hard disk sector data can be read.
2. Implementation process:
(1) Evaluate the extent of damage to the hard disk firmware area. If the general module of the firmware area is damaged, it will be rewritten with a good module according to the module matching requirements. If the special module of the firmware area is damaged, it shall be regenerated and corrected according to its own verification algorithm;
(2) If the firmware fails to be rewritten or corrected and an error is reported, the firmware area is likely to have been scratched or the magnetic head has been damaged. At this time, you must perform further recovery according to the corresponding failure solution;
(3) If the hard disk is encountered during the mirroring process When it comes to bad sectors (which often occur in actual cases), corresponding bad sector solutions must be adopted to control the equipment to read hard disk data safely and quickly;
(4) Perform logical analysis and verification on the complete hard disk image backed up by the equipment, If there is an inconsistency in the file system in the image, it will be repaired according to the solution of the corresponding file system damage until the data required by the user is migrated.
3. Acceptance process:
(1) Count and summarize all the attributes of the migrated data, and ensure that all the data required by the user has been successfully migrated in terms of the number of files and capacity;
(2) Perform a unified algorithm integrity verification on all migrated data to ensure that the files are correct in terms of directory structure and underlying logic;
(3) Perform targeted verification on key data files specified by users to ensure that users are critical The data is restored perfectly.
(2) Reliability analysis and time estimation of recovery:
1. If the hard disk is a single failure type with the firmware area damaged and there are no bad sectors in the firmware area, the recovery success rate is higher, and the time is 2 hours -6 hours;
2. In addition to the damage to the firmware area, there are physical bad sectors in the hard disk (the disc is not scratched), then further recovery must be done in accordance with the physical bad sectors solution, the success rate is higher , The time ranges from 1 day to 2 days;
3. If the hard disk is damaged in addition to the firmware area, but is also accompanied by damage to the head or motor (the disk is not scratched), then you must follow the corresponding fault type solution For further recovery, the success rate is still high, and the time is about 2 days;
4. If the hard disk (firmware area module data is stored on the disk) is scratched, data recovery will become extremely difficult or even impossible to complete .
[Tips] (1) The importance of the firmware area: The firmware area is a hard disk as a module that records the hard disk’s own information (including hard disk boot information, parameter information, bad track list, etc.) The normal working software unit provides various parameters for the head to read data. If this module is damaged, the hard disk will lose the basic information source for controlling the head to read and write, and it will not be able to complete the function of data exchange. (2) Possible reasons for the failure: 1. Bad sectors on the hard disk cause a module error in the firmware area 2. Abnormal power supply causes the module in the firmware area to be written incorrectly. (3) Hidden troubles and damage levels. The degree of damage to the hard disk may cause bad sectors. Star rating: ★★★ Hidden danger 2: The hard disk’s bad sectors may cause damage to the hard disk head. Star rating: ★★★★★ (4) Hard disk protection tips: 1. Do not continue to power on the faulty hard disk for a long time. Continuous application of electrodes after damage may cause bad sectors on the hard disk or more serious head damage, which is harmful to data. The impact is very large, and data recovery will be very tricky; 2. If the hard disk has been knocking (a regular abnormal noise is heard after power-on), do not continue to try to power on the hard disk. It may cause the hard disk platter to be scratched by the damaged head, which is fatal to the data damage, and the data recovery work at this time will become extremely difficult or even impossible to complete.