Problems with other hardware: One important component of your laptop is the RAM. It is a temporary storage device that stores information that is frequently used by the processor. It has been said that if something is capable of corrupting the data in RAM, it is capable of corrupting the hard drive contents. Some of the things that corrupt the RAM are a bad processor fan, over-clocked PCI bus, very long data cables that are in a bad condition, overheated hard drive and a non consistent motherboard, hard drive controller and processor. Failure of this hardware can lead to corruption of the data that is written to the disk.
Not exiting correctly from your operating system: All operating systems have a certain way in which one should exit when shutting down the computer. If this ways are not followed operating system file may be corrupted in the hard disk. This can occur through various situations such as the laptop user switching off or resetting the laptop, if shutdown process fails, if there is a power cut and the computer resets itself, or if the computer freezes and/or locks up so that shutdown is impossible. The data corruption that will be experienced here mainly affects the operating system files. Once this occurs, when you boot your system again, you will most likely get an error message dealing with the operating system. The damage caused could be incorrect free space count, lost clusters and possibly incorrect file lengths.
Laptop Hard Drive Failure: The laptop hard drive fails in many ways. Some of them include head crash i.e. the read/ write heads touch the surface of the disks causing damage, air within the sealed hard disk drive unit becomes polluted, unexpected failure such as the operating system failing to recognize the drive, wearing out of the surface, may be due to pollution again. The reason could be that the air filters are malfunctioning.
Another reason is due to presence of corrupted sectors caused by viral infections.
More information about laptop hard drives follow the link.
Laptop Data Recovery: Why you need an expert
How to Restore a corrupt hard drive
All you need to know about RAID systems
Steps of RAID Recovery
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