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| What is the difference between Logical and Physical data recovery? |
There are two forms of data storage failures: logical and physical. Therefore, it is necessary to distinguish between the two data recovery procedures:
Logical data recovery (reconstructing the file system and/or the files)
Physical data recovery (extracting data from corrupted media)
The logical data storage failures are usually a result of file system corruption.
In this case, data has been accidentally lost due to:
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File deletion |
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Overwritten files |
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Viruses attacks and worms |
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Power failure or power surge |
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Software failures |
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File corruption |
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Reinstallation of the operating system |
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Corruption of critical file system structures |
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Formatting or repartitioning |
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Missing partition |
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Boot-up problems |
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Formatted hard drive |
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Application crash |
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System shutdown |
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Logical data recovery is the process of reconstructing data from storage such as hard and floppy drives, CD/DVD media, flash memory cards that are not physically corrupted. The hard drive is still recognized by the system BIOS, but data appear to be inaccessible.
If a hard drive is not detected by BIOS or by other disk utilities, it can be considered as physically damaged and it requires Physical data recovery. Physical data storage failures can result from a variety of causes. There are two main categories for physical hard drive failures: mechanical and electronic.
Mechanical hard drive failures include damage of the spindle motor, head crashes (clicking, ticking or grinding noises coming from the hard drive), which can result from excessive heat, vibration, accidental drop, liquid or fire disaster. Electronic hard drive failure can be identified through the circuit board on the bottom of the hard drive. This kind of failure can occur unexpectedly, even with a brand new drive, and is caused by a faulty component. Sometimes, it can be due to an improper installation. Physical recovery procedure might be more challenging than logical in point of having the necessary parts to get the drive functioning again. These repairs generally require soldering skills and thorough knowledge of electronics to be successfully completed.
One of the most important things you need to know in situation of any kind of hard drive failures is to SHUT DOWN YOUR COMPUTER!!! Keeping your computer working can cause further damage to the drive, and decrease the chances of successful data recovery.
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