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Hard drive recovery is an increasingly needed service as we are more reliant on hard drive and other data storage services. The problems that happen with hard disks can be classified into two types:
Logical problems: These problems occur when the file system has issues. The hard drive is fine however the files cannot be accessed, have disappeared or are corrupt. The cause for logical problems can be files deleted accidentally or intentionally, virus attack or the hard drive could be reformatted in error or poor software.
Physical problems: The hard drive can be defective if it isn't spinning, there are problems reading the drive, demagnetisation, has bad blocks or making noises. This can be caused by a manufacturing defect, mechanical impact or voltage oscillations. Data recovery is possible but as the drive has physical problems it will normally be binned after data recovery.
Hard Drive recovery can be classified in five types:
Type 0: There is a type 0 for cases where it is data recovery however a technician could solve the problem. For example Windows doesn't boot. Here the technician would simply put the hard drive in another machine, copy the data and then reinstall the system. This means there is a back up of important data should the hard drive need to be reformatted.
Type 1: A type 1 problem would be classified as a simple data recovery issue were no physical damage is present. Examples include hacker or virus attack, lost partition or deleted files. This type is for lost data but data that hasn't yet been overwritten therefore the data is still on the hard drive and there is a high possibility of recovering the data.
Type 2: Problems would be things like having partial overwritten data at the important points of the disk because programs have been reinstalled or poor recovery tools have been used and have probably caused more damage than good. Other operating systems that are used make data recovery harder so they would be in this group too, examples are Novell and Linux.
Type 3: These are the most serious cases which would likely have physical problems like suffering from a serious crash. There may be a reason sometimes like a mechanical chock or voltage oscillations but the cause could also be a defective manufacture.
Type 4: The last hard drive recovery type is reserved when there is no solution to the hard drive issue. Most cases here would be suffering from physical problems were the drives have been damaged beyond recovery like a severely crashed surface. No one will be able to recover the information. This type is also were information has been lost but has been completely overwritten.
If you have important information to recover seek professional advice, internet tools can cause more damage and won't be tailored to the situation.
Disclaimer: All information on this site is provided for informational purposes only! By no means is any
information presented herein intended to substitute for the advice provided to you by any health care or other professional
or organization.
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