Face hard head damage problem, how to save the data?

[Fault type]
(a) the type of fault: a hard disk head crash
(ii) typical characteristics:
1. a hard disk can not correctly identify its own power or capacity model
2. hard and can not read the data correctly with a large number of bad sectors regularity
3. hard knocking phenomenon (after power to hear a regular abnormal sound) appears after power-up
(c) the extent of damage star rating: ★★★★
[solutions]
(a) recovery process
1. detection process:
(1) power to the hard disk, and a hard disk access device further testing;
(2) whether to view or model can correctly identify the capacity of the hard disk;
(3) relies on the device operation state of each head good drives identified.
Process Embodiment 2:
(1) the degree of damage to the hard disk heads evaluated. If the head can still read the correct models and their capacity, and the head portion has a good operating state, the control state data rely on good magnetic head device in the shortest possible time can be read normally read out in advance;
(2) The head models match choose the right spare disk, and a magnetic head in a clean room for the failed disk replacement operation, after replacing the hard disk to read the data access device;
(3) if disk mirroring encountered bad sectors (real cases often) shall take the appropriate solution for bad sectors control apparatus hard to read data safely and quickly;
(4) a complete image of the device backup hard disk out of the logical analysis and verification, if inconsistencies in the file system image is present, the repair solution in accordance with the appropriate file system damage until the migration of the user required data.
3. Acceptance Process:
(1) do statistical properties of all the data has been migrated out, in terms of the number of files and capacity to ensure that users have all the required data migrated successfully;
(2) do all of the data has been migrated out of the integrity verification to ensure that the correct files in the directory structure and the underlying logic and so on;
(3) critical data files to user-specified targeted check, ensuring that users successfully recover critical data .
(B) reliability analysis and estimated recovery time:
1. If a single hard disk head damage fault type (not scratched disk), the recovery relatively high success rate, time is about 2 days;
2. If the hard disk in addition to an outer head damage, there is a problem area physical bad sectors or firmware (not scratched disk), this time to be restored in accordance with the corresponding fault further type of solution, the success rate is relatively high, time is about 2 days;
3. If in addition to the hard disk head crash, accompanied by damage to the motor (not scratched disk), this time shall be further damage to the motor in accordance with the recovery solution, the success rate is still relatively high, time is about 2 days;
4. If the hard disk piece is scratched, the data recovery will be extremely difficult if not impossible to complete.
[Tips]
(a) The importance of the head: a magnetic head to read and write data disk platter (including hard disk firmware area information, user data, etc.) of the module, a bridge data exchange, if this module is damaged, the external hard disk the internal data exchange channels will be cut off, its importance can be imagined.
Possible Cause (ii) failure of:
1. hard bump lead to head damage
2. Power lead to abnormal head burned
3. hard disk bad sectors continued to increase after the damaged area electrical lead or firmware head damage
(c) the extent of damage and failure risks Star class Rating
hidden 1: continuous power on after head injury may lead to head scratching disc
extent of damage star rating: ★★★★★
(four) hard disk protection tips:
1. avoid the hard disk will no longer bump, bump multiple pole It has the potential to damage the hard disk, which is fatal destruction of data, while data recovery efforts will be extremely difficult if not impossible to complete;
2. DO NOT continue to try hard to power up, this time plus electrode may lead to head scratching hard disk is damaged, it is fatal destruction of data, but this time the data recovery work will become very difficult or even can not be completed;
3. avoid non-professionals damaged hard drive removal, replacement of the head, hard drive heads type matching, replacing the head of the environment (clean room) and data read safety equipment requirements are very strict, if non-formal replacement of the hard drive head operation, the data on your hard disk will cause a very serious impact, even permanently destroy data on the disc.