Some myths of HDD
1. There is a vacuum inside of the Winchester HDA. Certainly it's one of the most frequent mistakes. It's incomprehensible that people think so, but this can't be real as a matter of principle, because the magnetic heads soar about the disk surface at the expense of air stream, which is produced by rotating “pancakes”. So, if there is no air, the Winchester won't work due to the laws of physics. Actually there is simple air inside the HDA which is purified at the expense of air filters with the same pressure such as outside the HDA.
2. If the Winchester's magnetic heads has failed and the disk thrums, you'll need to replace the magnetic platters into another serviceable Winchester for removing data. It's the second common mistake. It's not clear, why people think, that it's necessary to replace the platters, though only magnetic heads has broken down? In practice the replacing of the platters into another HDA is a very hard work an sometimes it even can't be done. Even professionals use this method only in case if bearing box is jamming. It is so difficult because after replacing the “pancakes” they need to be centered relative to the axle shaft, preserving the disks’ displacement angle relative to each other. In most cases it's much simpler to replace magnetic heads from the serviceable HDD into unserviced, because magnetic heads of most HDD models are fastened on their axis and they don't need to be centered.
3. There are special stands, where you can right from the magnetic platters read the information from the damaged disk. Right, such stands really exist, but you may find them only somewhere abroad, the cost of hard disk recovery at such like stands will be somewhere about tens of thousands of dollars, it's possible only for several HDD models, data recovery will be only partial. That's why it'll be more correctly to think, that there is no such a universal in general comprehension stand. It is connected with several moments. First, all modern storage have different systems of technological orders and also there is such a thing as compiler, so if you'll read all disk sectors logically, it'll be necessary to get somehow the logical data structure from the physical sectors. Second, the concentration of data recording of modern HDD is so, that reading information from the HDD surface is possible only by staff heads, but this will have no sense if the platter will have a scratch, in this case the heads fail immediately.
4. The data, which is rewritten must be recovered by the remanent magnetization method. The method of recording data in modern HDD means full magnetic reversal of part of the surface while the information is recordered. That's why the remanent magnetization simply doesn't exist.
5. Government secret services as FBI have on hand super equipment, which simply commercial companies don't have. In reality there are also no magicians in FBI, and certainly they don't have some marvel devices for HDD data recovery in any cases. Moreover, people from secret services very often appeal to hard disk data recovery commercial companies for help.
6.There are cases, that people, when at service center, tell that they don't need the hard drive repairment , but they need just to rewrite the data from it. That's a pity, but it's impossible to copy the data from the damaged hard disk. Nobody still can't do this very work. So, first of all you need to fix your hard drive and only then you may copy all the necessary data from it.
So, when you have so problems with your HDD, don't do anything with your own hands. If after reading this article you have some questions - better consult a specialist to avoid more huge problems.
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