When a file or data cannot be accessed normally because it has got corrupted, failed, damaged or has become inaccessible, the process of trying to recover it is known as Hard Disk Recovery. Media files which can store data like internal or external hard disk drives, CD’s, VCD’s, USB, and SSD, storage tapes may face physical or logical damage to the file system preventing it from being used on the operating system. When this happens, it becomes necessary to recover the data or it may be lost forever.
Types of data recovery –
The first type of data recovery is done when an operating system fails, where the main aim is to copy all the files that have to be saved or recovered to another disk. A live CD comes handy in this case, which can be mounted on the system drive and a backup of the required files can be taken with the help of a file manager. To avoid such hassles, important data should be saved on a different location from the normal OS system files, beforehand. In the second type, a certain file may have been deleted from the file in which it was stored. However, when deleted, the contents are not immediately removed; the space is made available for new items to be overwritten. It may be found in broken parts which can be recovered as the original contents remain. In the third type, a disk level-failure may occur which includes hard-disk failure or partition. Here, the data cannot be read. Various solutions are sought after in this case varying from repair of file system, divided tables or master records. Software-based recovery in minor corruption of data or replacement of the hard disk when physically damaged may be sought after. If the hard disk fails permanently, professionals try to recover whatever data they can.
Physical and Logical Damage –
When the damage is physical, there are a number of ways to recover data from the damaged hardware. Parts replacement is one of them. Disk-imaging procedure to read whatever data can be read is also another way where the image is taken and saved on a different medium where it can be safely analyzed and one can assess as to how much data can be actually recovered. When the problem includes solutions relying on the software-levels and not on the hardware, it is known as logical damage. In these cases, generally all the files cannot be recovered and only part recovery can be done depending on how severe the damage is. When the damage is minor, the individual can recover the data himself but when the damage is major, expert help may be sought after.
Remote Data Recovery
Physical access to the drives which have been damaged isn’t necessary when experts try to recover data as it can be done by software techniques with the person trying to recover the data sitting at a far off location, with the help of internet or network connection with the faulty site.
Ali Asjad is a Sweden based hard-disk data recovery expert. He is also a contributor to tech blogs and writes frequently about data recovery.