Anyone using a PC for some time for sure faced with at least one case of data loss . The data can be lost so easily that you're practically forced to make backups of all your precious files, for obvious security reasons. Data loss can occur due to various reasons, including:
Physical Damage
When the storage unit of your data is physically damaged, recovery of data is often difficult. Physical damage may be a scratched CD or DVD, the fall on the floor of a hard disk and so on. Physical damage can be avoided, but you can never protect yourself from them 100%. A disk drive, for example, may fail due to simple aging, an excessive workload and so on. CD and DVD are never totally protected even if they are kept in optimum condition and free from dirt and scratches.
Logic damage
Logic damage of the data is at a structure level and is pretty different from physical damage. Logic damage is more common, because it can be caused by several additional factors, such as power failures, system crashes, driver issues, problems with RAID controllers and stuff like that.
Human error
Human error includes all other cases, including accidental deletion of files, errors overwriting files, as well as document formatting most of all. Basically, the three types of causes of data loss described, human error is the easiest to avoid despite being the most common due to poor computer skills, impatience or distractions.
Often, the success of a data recovery depends on the circumstances for which they were lost or discarded. Of all the causes of data loss the most difficult to repair is physical damage to our drivers.
If your hard drive damages were serious there's absolutely nothing to do to recover the data and no program or specialized data recovery data recovery professional will be able to help. But not all the hardware (physical) fall into this category at risk. For example, a hard drive failure with the engine still has a chance to recover data, whereas if the section that contains the logical data is burned or magnetized, probably have no chance of recovering the files.
The simplest type of data loss to be recovered, fortunately, is the one that falls into the category of human error (fortunately it is also the most common). When you delete a file from your operating system, does not mean it's gone forever. What happens is that the operating system keeps the file in a specific area of the hard drive and stores it. The only way you can really delete these files is to rewrite this sector of the disk with new data, over and over again. This means that time is an important factor when it comes to data recovery . If you have deleted a file yesterday, for example, it is likely that your system has kept the file on your hard disk. However, if you deleted the file last year and then erased, overwritten and moved to various files on your hard drive then it is likely that recovery of data becomes impossible.