How Data Recovery Works?

By: David Lee

There is no need to worry about data recovery anymore because you can easily recover data by hiring professionals. Data recovery, in its simple case, usually takes 2 to 3 business days and more if a more complex situation arises such as due to disk failure.

Based on the level of data recovery there are two types of data recovery: Soft and Hard (also known as simple and complex recovery respectively). Soft recovery includes recovering file system damaged due to partition, virus, power failures, conflict with software etc. Recovering simple and common files namely database files, office files, multimedia files, and recovering passwords of operating systems and of other files types are also included in this type of recovery.

Hard recovery includes data lost due to hard disk failures, hardware failure etc.

Data loss is divided into two categories: Physical and logical. Based on these types data is recovered accordingly using different techniques.

Physical damage includes hard disk head crash, too many bad sectors, failed motors, magnetic tapes broken etc. Physical damage also in turn causes logical data i.e. loss of data or damage to file structure. Physical damage usually cannot be repaired by user and thus data recovery by the user is not possible. The reason behind this is that it is most likely that when user opens the hard disk metallic casing, dust will be easily placed (not detected by naked eye) on hard disk platter causes further damage.

The technique that is involved in recovery of data is replacing hard disk damaged parts and then disk imaging is used to recover data. Hardware repairs include replacing original damaged parts of disk with an identical part from another disk of same type. This can include replacing read/write heads, replacing hard disk platters etc.

After replacing damaged part disk imaging technique is use to recover data. After logical damage is repaired the raw image is extracted and then reconstructed to recover data.

Most common type of data loss is due to logical damage. It is usually caused by power failures, virus attack which corrupts file structure. Indirectly, logical damage also occurs due to physical damage. Software is used to recover data. First the disk is scanned to check if the structure is consistent with the specification. Another way to recover file is to repair by using little knowledge of the state of the file. The file system is rebuilt from scratch by taking information from undamaged areas. Although this technique doesn't repair structure but is used to extract data.

There are some techniques available as well that recover over-written data.

Data recovery is not an easy task to perform. It is always recommended to hire professionals to do the job instead of attempting it on your own.

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