HDD mechanical failure


Head Disk Assembly – HDA is the most sensitive part of every, hard drive since it is critical for operational capability. In our Laboratory terminology, all malfunctions of this assembly are called MECHANICAL failures.

Those are:


Reading/writing of data is done by magnetic heads which levitate over the surface of the platter. Disk heads are really miniature magnetic dipols, which are run by actuator. This is the most common failure. It is manifested by a screatching sound, or continous banging noise. This sound is produced when the reading/writting assembly hits the bumper. And it is called heads malfunction.


Data in hard drive is stored on the surface of a magnetic film which is coated onto the platter in a special procedure. To protect this layer, a special protective tincture is applied over this film, serving to protect the integrity of the media itself during the regular usage (the most common stress is the change of temperature, next working hours, vibrations, accidental hitting and many other factors). In normal working conditions, there is rarely physical damage of the media, but, when it appears, it is almost always extreme damage. In other words, data recovery from the disk where the media itself is badly damaged is impossible in large number of cases. Disk can have one or more platters, and sometimes the damage is present only on one of them. In those cases, Data Solutions Laboratory maximizes the chances for succesfull data recovery by accessing only undamaged platters. After the completition of the cloning process of those zones, we proceed with cloning of the damaged platters. In that way, the integrity of the media is protected untill the very end.


Spindle is a part of disk that starts and runs (turns) the platters. It is his responsibility to keep the rotational speed constant (most commonly 7200RPMs, but it goes from 4200-15000RPM). Needless to say, the spindle is one of the technologically most advanced component – decades of research and development – starting from step motors at first to FDB (Fluid Dynamic Bearing) today. As the density of the data which can be stored on the platters grew, spindle had to be more and more reliable while working – which is the reason why ball bearings in the spindle were replaced by a special lubrication. Even though they are almost perfect in their performances, they also have flaws, most commonly that lubrication, which was shown to be dangerous in some models – classic expample Seagate 7200 series – the spindle blocks while working! The malfunction itself is manifested as a PCB failure, but even after changing the disk does not SPIN-UP.

As a first regional Laboratory, we have the capability to recover your data, regardeless of all those malfunctions. The nature of the mechanical malfunctions, as well as hard drive sensitivity, are what determines the price of data recovery. Thanks to the procedures our company uses, the client is always made aware of the entire process. Data Solutions Laboratory always asks the client’s permission to open the chamber of the disk, and all operations are performed in a class 100 Clean Place. By using the Sagi filter, we remove 99.9997% of dust in the air, and give our clients top security regarding the integrity of the media itself.

Disk will never get out from our Laboratory worse, comparing to the condition on reception.


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