Hard drive data recovery consists of recovering the information contained on damaged, corrupted, inaccessible or faulty hard drives, which cannot be accessed normally, as well as recovering deleted files. The recovery of data from the hard drive is one of the most demanded services by companies, individuals and governments, since the loss of data due to hardware or software failures, accidental deletions or viruses is something that sooner or later happens to every user.
Tools for data recovery
There are numerous circumstances that can lead to data loss and make it necessary to recover data from the hard drive, such as hardware or software failures, incorrect computer shutdowns, viruses or unintentional, erroneous or accidental deletions.
To try to recover information there are utilities for data recovery from hard drive, programs that allow both to recover data from damaged hard drives and to recover accidentally deleted files. These hard drive data recovery techniques are also used in computer forensics and espionage.
These hard drive data recovery tools are based on the fact that when deleting files with the usual methods or when a hard drive fails, what disappears is the file allocation table but the contents of the file still remain on the disk until it is overwritten. It is therefore recommended that the software be applied quickly and installed on a different disk drive than the affected one (or run from a Live-CD), to avoid overwriting the data.
In case you can not recover the data with these tools for data recovery from the hard drive, you can resort to companies specialized in data recovery from the hard drive, which have more sophisticated means, being able to even repair the hard drive.
Although generally the goal is the recovery of data from the hard drive, the same methodology applies to any other physical or logical storage device, such as a partition, CDs, DVDs, RAID, magnetic tapes, floppy disks or flash memories.
Preventive measures
The most effective measure to avoid losing important information in case of hard drive failure and having to resort to hard drive data recovery tools is to make backups, for which we have several options:
Backup to another partition on the same hard drive. Backup to a different hard drive. Backup to removable media (CDs, DVDs). Redundant RAID.Secure file deletion
Parallel to the development of utilities for data recovery from the hard drive, tools have been developed that do exactly the opposite, called utilities for the secure deletion of files (shredding or wiping), whose function is to delete the files irretrievably, so that they can not be recovered even with data recovery tools.
Basically, the method used to achieve this consists of overwriting the file repeatedly with random data.
Source: Hard Drive Data Recovery
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