The type of data loss of mobile hard disk and its solving method

specific mobile hard disk data recovery failure type:

A. Logical failure:

Error partition, wrong format, mistakenly delete, false clone, partition table information loss, boot sector information loss, MBR damage, DBR damage, virus damage, hacker attack, etc.

　Second, physical failure:

BIOS does not recognize the disk, hard disk, the motor does not turn, the circuit board burned out, the disk broken, etc. hard drive bad road (physics, logic); password cracking: can crack a variety of operating system password, BIOS password, cracked file password, such as a number of password cracking services. Interface support: Can repair IDE, SATA, SCSI, FC, RAID server data recovery, and so on.

Third, the external circuit failure:

Most of the external circuit problem is the power chip or spindle drive chip burnout caused by the hard disk circuit board quality problems, design defects, mains fluctuations, sudden power outages, chip aging or poor heat dissipation, static and other causes of chip burning, breakdown, serious will also affect the head chip damage. This situation can basically be solved by the repair of the external circuit.

　Four, disk bad way:

The hard disk head is read too long or unreadable in one sector of the disc, and the sector may be a bad sector, which is often referred to as a bad path.

The bad road generally behaves as follows: Unable to start, frequently freezes, reads and writes difficultly and so on. Mainly due to long time use, abnormal shutdown, sudden power outages and the use of strong vibration caused by the process. But also in the vicinity of bad sector regular reading and writing will cause the number of bad sectors to increase and spread, in the long run will make the head for long-term high-power reading and writing and accelerated aging, eventually scrapped.

After the hard drive has broken down, you can recover the file through a dedicated disk tool that reads or mirrors the data in the non-bad region.

Missing or damaged firmware information:

The firmware is used to control the operation of the hard disk's own instruction set, is the hard disk read and write parameters, it is the same as the file on the hard disk is stored on the disc, the difference is that it exists in the location of 0 outside the region, usually called negative track.

Same as files, due to sudden power outages and negative track and so on, and so on, can also cause the firmware information lost or damaged, and caused the hard drive unrecognized or mistaken, so that the data can not be read correctly.

In this case, PC300UDMA, HRT and other disk-level tools are used to rewrite or modify the firmware area to read the data normally. However, the firmware area of the problem of the hard drive in all hardware failures accounted for a large proportion, and not every piece of firmware damaged disk can be recovered in this way, depending on the hard disk's specific brand, model, batch and other related information to determine the way to use the recovery.

　　Six, head damage, offset, disk abnormal sound:

After the hard drive power, there is a "click, click" Of the sound, in the motherboard CMOS can not detect.

This situation is mostly due to the sound of the head being damaged, which is not able to be initialized to swing back and forth, and is rarely caused by the failure of the firmware to locate the correct information at the specified position.

If the hard drive has an abnormal sound, turn off the power immediately. Do not blindly repeated power attempts to avoid the deformation of the magnetic head on the surface of the disk scratch, causing irreparable damage. This situation must be in the super net between the disc cavity open, to replace a set of good working head, can be the original disc on the full recovery of data. The work environment and engineer manual requirements are very high.

　　Seven, hard disk decryption:

Because some data is more important and sensitive, users need to encrypt it. Most laptops now have the ability to encrypt hard drives directly, and there are third-party software that makes it impossible to use a hard drive without entering the correct password to ensure overall data security. Once the password is lost or the system crashes, even the user cannot read the required data themselves! At this time need to use some professional tools and special means to unlock the password to read out the normal data, but now the means of encryption are various, the way of encryption is endless, not every kind of encryption can be untied, It also requires constant analysis and experimentation. It is recommended that users develop good backup habits and make regular backups of important data.

　　Eight, the spindle motor damage:

Since most of the current hard drive to improve the speed of reading and writing disk spindle motor speed increased, manufacturers are also commonly used liquid bearings to increase the service life of spindle motors, but in the use of the process is still part of the disk does not turn, speed down or unstable, excessive noise, reading instability and other symptoms. In this case, the spindle motor of the hard drive must be repaired to successfully export the original disk data.

　　Nine, hard disk broken:

With the popularity of mobile hard disk, the phenomenon of falling off on the ground during the use and movement is very common, this kind of high strength impact and vibration may cause the magnetic head offset, deformation, spindle motor bearing eccentricity, deformation, disc deformation and so on. In this case, users are advised not to blindly repeat the attempt to avoid the deformation of the head on the disc to form a serious scratch, resulting in irreparable damage.

Encountered this situation must be in the super net between the disc cavity open, to replace a good set of normal working head or motor, in order to restore the original disc data intact. Very high requirements for working environment and engineer Manual.

　　Ten, Disc Scratch:

Disk in the course of the operation by the violent vibration, or magnetic head deformation but still blindly to try and other operations are likely to cause the disc scratch, which makes the success rate of data recovery greatly reduced.

Depending on the area and severity of the injury, there is a significant gap between the likelihood of successful recovery. If the scratch area is in the firmware area, the likelihood of recovery is very small. If you are in the data area, then the cost of recovery is quite high and only some of the data can be recovered.