• Data recovery technology analysis and practice

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    • Research
    • The restoration involves software computer data recovery, hardware recovery, database recovery and other aspects of the technology. Domestic soft recovery deeper, but compared to the foreign professional company, there is still a gap. Hardware data recovery, database and profiled system, deeper theory of the United States and Russia, this is because the main technologies are controlled in Western countries. Data recovery techniques covered American Studies is a more in-depth, the U.S. military can recover data covering 6 to 9 times, Russia can recover data covering 3 to 4 times, the IBM company spent $ 600 million research 2 to 3 times the data can be restored coverage.     Early in the eighties of the last century, foreign research data recovery, twenty years earlier than ours, they have a significant advantage, both from the theoretical and technical. Abroad, the latest advances in the field of data recovery, its not only the data security issues into account, it is the data encryption technology, data security technologies, data recovery technology three combined to form a data security system, which is data security an important development in the field of trend.     China in the field of data recovery from scratch, although developing rapidly, but after a late start, many theories, though not quite perfect, but in data recovery technology standards development, China has also developed a number of standard and specific data targeted loss problem solution, covering data recovery technology practices and applicable standards. Therefore, we can say our country despite lagging behind Western countries in the data recovery field, but China both in the research and development investments or in the outcome output in recent years have made gratifying achievements, also confirmed the data from another security, data restore important value and commercial potential.
    • Analysis of the data recovery technology
    • 2.1 Data recovery concepts     
    • The so-called data recovery technology, is through a variety of means to restore the loss and destruction of data for normal data that is restored to its true colors. Data recovery recovery process will be saved in the data on the storage media re-stitching finishing, even if the data is accidental deletion or disk drive failure, as long as in the case of the storage area of ​​the storage media is not severely damaged, or data recovery technology data recovery intact. Data recovery disk data recover not only files have been lost, you can also restore the physical damage, different operating systems, the data can be restored.
    • 2.2 The cause of the loss of the data
    • Resulting in more data loss reasons, major malicious programs, malicious damage, misuse, operating system, application software error, hardware failure, encryption and permissions, power-down, memory overflow and upgrade nine errors.
    • 2.3 Data recovery way
    • Data recovery through technical means, electronic storage media, and other equipment damaged or lost data will be saved to the rescue and recovery technology. Abroad earlier, it has formed a relatively complete data recovery system. Recovery data recovery are divided into hard recovery (hardware problem), soft recovery (file system), large-scale database systems, shaped system data recovery, data coverage after data recovery five categories. Specific shown in Figure 1.1.
    •  A, hard recovery. It is due to hardware failure caused by loss of data, such as a disk, the circuit board is damaged disc bad bad track, the disk is damaged, the disk internal system area severe damage, etc., in this case, almost always a system does not recognize disk or recognize disk difficulties and other symptoms. Difficult to recover, if the internal disk data area is heavily scratched, it will result in permanent data loss, and can not be restored. User a little common sense, in this situation (such as a mobile disk drop), it will not power to try repeatedly, it will not cause a large area of ​​artificial scratch Therefore, this case was able to recover most of data.   
    •  B, soft recovery. Refers to the loss of data storage, manipulation, file system level, this loss is in many aspects, such as system hardware and software failures, crashes, virus damage, hacker attacks, trojans destruction, misuse, array data loss; For file system in general, this research work started earlier, deeper than that of the domestic and foreign research. The main difficulty is: file fragmentation recovery, document restoration and password recovery.     Software recovery can be divided into system-level recovery and file-level recovery. System-level recovery is the operating system can not be started, using a variety of repair software to repair the system to make it work properly, thus restoring the data. File-level recovery, just an application file corruption refers to the storage media, such as OFFICE file corruption repair software to its repair and restore the file's data.     
    • C, a large database system recovery. The large-scale database systems are often stored with some very important data. The composition is complex, generally will have better protection measures, it is generally not a problem, but as long as the problems are basically difficult to deal with the problem, the difficulty of recovery is relatively large.     D Shaped operating system data recovery. Is used relatively rare in the operating system, data recovery, such as MAC, OS2, embedded systems, handheld systems, real-time systems, etc..     E, the data is overwritten recovery. Data is overwritten, recovery very difficult, with the other four types of data recovery, there is a qualitative difference, only disk manufacturers and the special department of the few countries able to do, its application is generally related to national security.     Data recovery technology level     Classified according to the degree of difficulty and the development level of the technology research and development, the data recovery technology can be divided into four levels.    
    •  3.1 software recovery alternatives with simple hardware DiskGetor data recovery tool software can be more than lost data recovery. Can recover accidentally deleted error formatting, partition table corruption, at the same time such data loss
    • PS : If the above does not work , do not do irreversible operation should find a professional data recovery personnel or data recovery company to help otherwise cause data unrecoverable loss .