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There are many causes to lose data:
Hardware malfunction related with age, bad environment or over-clocking
Errors in operating systems and application software (logical errors in
computer programs)
Very often a bad sector or cluster can cause the operating system to fail while
booting up. Very often we can also restore the hard drive to a working state
but we strongly recommend replacing the hard drive after the data is
recovered
from it. If a hard drive starts developing bad sectors / clusters it is very
possible that, after we reinstall your data on good sectors / clusters and mark
the currently unusable sectors / clusters as unusable, that currently good
sectors can become bad sectors and you will have newly corrupted data.
Human factor (accidental deleting of files, folders or partition, disk
reformatting, and so on)
If a partition is accidentally deleted we can restore the files for you
quickly. In most cases we will recover your data to a CD or DVD and, if you
desire, restore the partition with all your data intact. If a partition is
accidentally deleted, do not re-create the partition. This will make it
much more difficult (and expensive) to restore 100% of your data.
Computer viruses arriving with Emails, pirated software, hacked Web-sites,
hackers intrusion from Internet, and so on
Because almost all virus’s and Trojans do little more than annoy or cause minor
(from a data recovery viewpoint) logical damage to a hard drive we can usually
recover any files lost due to a virus quickly. The sooner we get the drive
after the malicious attack the better, as deleted files can be quickly
overwritten by the operating system without the user’s knowledge. Windows
itself (9x, NT, 2K, and XP) as well as a large number of applications
constantly create temporary files and it is possible that any of these
temporary files can impede the data recovery process. They could make it
impossible to locate the desired files, or they could overwrite some of their
data.
Weather related disasters (lightening, fire, water, smoke and so on)
Sudden mix of the previously named factors
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