I happened to visit a class where I learned why data recovery on crashed disk is a process that can be handled with ease.
The data recovery experts have powerful soft wares that communicate to the hard disk by passing the Bios and the operating system. They are usually unable to read drives with bad sectors or even take a long time,
The software can read bad sectors instead of skipping them as it happens with the operating systems. By the use of special commands the software can regenerate the lost data.
The recovery software can handle drive errors like re powering and resetting the device when it stops reading the sectors.
The software is also capable of re-configuring drives by disabling certain functions such as SMART minimizing image timing and any other possibility of any further drive degradation
In situation where the disk is inaccessible due to damaged circuits, it is still possible to change the printed circuit board from an identical storage device and fixing it on the damaged device. This is usually done when the device is powered on so it is absolutely not recommended for any untrained person to try recovering data alone.
In a case where the cause of the crash is established and identified as a corrupt file. Available software can be used to rectify the corrupted file and installing a new operating system to clear the registry of the crashed operating system.
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