1. Logical loss of data: in that case the loss is due to data corruption, but not the hard drive.
Casual formatting or division of the hard drive – is one of the classic examples of careless work with a computer, and it is not surprising as this happens very often. A space on the disk, which was occupied by the data, is free now thanks to a careless act, but the data still remain on the disk, although not at the same place. Although the address FAT (file allocation table) of files has changed, but they can still be restored.
Virus attack: the virus is a program that extends automatically to your computer, without stopping copying, while removing and damaging system files. It is strongly recommended that the computers subjected to a virus attack will be examined by professionals, and special law-enforcement services have been notified about the incident. You can save your own data from viruses, but if it is not found the one who arranged this attack, it is possible that tomorrow you will suffer more.
Malicious deletion of data: not all data can be restored, but a reliable and professional company is able to recover most deleted files.
Fragmentation (division into parts): a dangerous threat to safety of your files, but separated files can also be recovered, if the process has not gone too far.
2. Physical loss of data: as it becomes clear that this section will describe the incidence of loss of data due to physical damage of storage media. Data can also be restored with such a character of damage.
Beat: Current systems are very resistant and can withstand a blow to 300g. It is recommended to take a damaged object to the professional examination. If you have damaged a part, trying to fix it yourself, then you risk losing your warranty on it.
Fire: even if the details look fried, it is not worth to open or view the hard drive yourself. If the temperature has not reached the melting point of iron, it is possible that the drive is not corrupted and the data still on it. Water in this regard is more damaging to the hard drive, since it can leak through the special coating and penetrate the hard disk.
Water: water can cause serious damage to your computer, so you should monitor the humidity, because water can get into the computer with damp foreign objects, which dries cause corrosion of the metal.
Data that even professionals cannot restore.
Logical data loss: data dispersal and recycling – in these cases data cannot be restored. In the first case, the data were removed again and again until its part have become so fragmented that they can no longer be put together. Regarding the second case, everything is simple: the information was recorded by another one, for example, digital video cameras can make such things, recording new information to old.
Physical loss of data: data can be lost forever:
– In the case of penetration into the hard disk of water;
– In the case of fusion of the disc from the heat;
– In the case of a severe stroke.
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