Everything about Data Recovery
We can hardly find any individual who has not confronted with hard drive crash and losing the data, that was not backed-up either. In the broadest sense, failure signifies the user an emergency with respect to external malfunction or internal circuit issues. However, for the sake of simplicity, we have discussed six attributes in the following section. We have further elaborated the reasons for the failure, symptoms to be aware of and steps or procedure to salvage the data. Moreover, the different types of drives face the challenge differently; hence, we have collated the recovery steps for desktop hard drives and potable hard drives.
- Electric failure
- Mechanical failure
- Logical Failure
- Complex Failure mode
- Firmware Failure
Electric Failure
Definition
Electronic failure caused by the unexpected surge in the power damages the PCB.
Why it occurs
The main reason for occurrence includes the over voltage. Power supply issues can result in electric failure. Nevertheless, the improper connection between the drive and the system yields failure. Finally the components blowing effect also brings the electric failure.
Symptoms
Symptoms normally include hard disk emanating click sound during the initialization process. Secondly, inability of the disk to function despite the power supplied. Thirdly, the disk knocking occurs, as it cannot spin.
What it affects
When the failure occurs, the hard drive head used for reading and writing purpose gets affected. Depending on the severity, controller board damages and results in the situation that is detectable by the BIOS. This results in deactivation of the hard disk spin.
Recovery
In most of the cases, the hard disk affected is recoverable. You have to be appropriate in replacing the affected controller board replaced by a specialist.
Mechanical failure
Definition
Most commonly, the physical type of failure like the mechanical failure occurs owing to the crashing of critical moving parts.
Why it occurs
Mechanical failure occurs because of the wear and tear of the machine. The common dreaded parameter is the head –crash. Besides this, the PCB damage, hard disk platter damage is common.
Symptoms
Symptoms of mechanical failure include the sounds produced during initialization (such as the clicking sound). The motor freeze situation occurs and results in inactive state of the drive. One can even hear the music sound when switching the disk.
What it affects
Although for many users, the motor failure is one of the common by-products when the disk dropped or accidently knocked while operating, the head crash is somewhat severe. By definition, read and write head crashes on the rotating platter. This results in the damage of the magnetic coating on the surface. Under normal circumstances, the disk retracts to safer area. The head is small electromagnet poised by a frame, which accurately placed over the disk platter acts as a boundary between the physical storage and the electronic parts. It stores information by transferring the electric signals to magnetic pulses. The platter usually rotates at a speed of above 5,400/ m and the head distanced from the platter by a measurement of one millionth of an inch, so when the head crashes on the platter the disk stops rotating.
Recovery
Usually when the symptoms are observed it is wise to consult the specialist and component replacement should be performed in clean room, wherein the room is devoid of dust particles which otherwise deteriorates the disk.
Logical Failure
Definition
We have seen the logical failure as the easiest to detect and diagnose, but if the complexity is higher further issues precipitates. Logical failure represents to all sorts of damage besides the physical one. Common errors include the file system, corrupted data and FAT table entries. Nevertheless, data is still available in most of the logical failure cases but in the unreadable form.
Why it occurs
Logical failures occur because of the disk incompetent attempt to format, or re-partition process. Inappropriate usage of the imaging programme also hampers the disk functioning. In some cases users runs disk check or some repair software when the system switches off, thereby leading to the condition wherein the software attempts to search for a non-existing file management. Likewise, accidental deletion or formatting and presences of malwares and bugs falls under this category.
Symptoms
Most common symptom includes the computer unable to recognize the hard drive. Despite the disk spinning operation, the data’s are in unreadable form.
What it affects
Usually, the data is unreadable and the BIOS are the condition not able to detect the external hard drive. The errors such as no disk found and OS not found are commonly noted. It can also yield to missing of folders, files, and prompts for re-formatting. The severe cases yield the sluggish effect on the drive.
Recovery
In most of the cases, the files recovered by appropriate data recover software. However, most importantly it is vital to differentiate as whether it is logical failure or some other, because wrong diagnosis causes irrevocable data loss. File systems repaired and partition table and corrupted data’s are removed respectively.
Complex Failure mode
Definition
The complex failure mode occurs because of combination of reasons. Quite often, the external hard disk failures are the net result of more than one single source. Combination of minor failures propagates the failure chain. The physical damage of the read and write head initiates the logical damage of the file system.
Why it occurs
It occurs due to the servo operation, manufacturer’s bad platters, formatting errors, careless handling and many more. Even the starches on the media surface results in a complex situation.
Symptoms
A combination of the symptoms is the clicking or the spinning sound in combination with the data loss and computer unable to recognize the hard drive.
What it affects
A classic example of complex failure mode is bad platter. Normally, the bad sectors are inevitable during the manufacture and in most of the cases; the users rarely encounter the bad sector as it is contained in the area not accessed by the user. However, owing to the wear and tear of the drive, many sectors develop and deteriorate the magnetic surface of the disk. The condition is critical, when many bad sectors develop and simultaneously slows the read and write process.
Recovery
The failure mode is recovered is recovered by recovering the data through an expert assistance.
Firmware Failure
Definition
The function of the hard disk firmware is to command the drive to establish the connection and as how to interact with the computer. In simple terms, it is the hard drive’s intelligence. The firmware instructs the disk spin speed, handles data location and many more. However, the drive firmware is drive centric with importance given to the model and parts number and hence indicates it in the specialized category and the firmwares are not homogenous. However, the firmware becomes corrupted and resulting in firmware failure.
Why it occurs
This is occurs due to the improper hard drive handling, or even switching off the system amidst the operation. Even the firmware fails because of prolonged usage.
Symptoms
The firmware codes positioned on the disk platter and on the PCB, board once corrupted fail the disk running despite the proper functioning of the other components. Other symptoms such as the display of incoherent characters and freezing the booting process occurs based on the severity.
What it affects
Firmware failure results in breakage of the drive, ranging from head crash to the ultimate state of non-responsiveness.
Recovery
Even though the firmware issues sorted by professional’s yields in data recovery, many a times owing to the firmware specific nature, the user must replace the drive.
Maintenance
Although there are latest techniques available at every corner to salvage lost data’s from your crashed drive, it is always advisable to keep the drive in prim condition. We have given a few tips to safe guard the drive,
- To prevent the hard disk from unexpected power surges it is advisable to incorporate surge protectors in the drive. It protects the computer and peripherals from excess voltage issues.
- Dust accumulation on the hard drive eventually insulates the heat and this rapid build-up of the heat damages the sensitive electronic components. Wipe the case and blow the dust on regular basis.
- Even the hard drive installation needs to be proper. In case of abnormal sounds heard, proper installation is required.
- Generally, taking frequent back-ups is a good practice. In case of very sensitive files, it is advisable to retain a burned copy.
- Physically handling the data like not to vibrate or shake it forcefully prevents the damage of intricate components in the drive.
- It is good to ensure that the drive is stored away from liquids and sunlight. Even magnetic devices like mobile phones and TV’s should stay away from the hard drive.
- Finally, scratching the drives causes serious damage to the data and the internal components.
