HDD Anatomy
To explain why removing the cover from the hard disk is not a good idea is useful to understand a little bit difficult ?, because some stores, and access to your data.
The hard disk is a circular disk on which data is magnetically stored and accessed through the head read / write on the pot (very close ? just a matter of microns) and interpret the magnetic data. This disk rotates at very high speeds (typically 5400 or 7200). Disk round (usually pot) is usually aluminum and glass, but it has a very thin layer on the specific data that is stored on the plate.
Special coatings are very sensitive, and the speed at which the crack passes into the hard disk can be easily damaged by small particles such as dust and other contaminants in the air. If you think this is overkill, then you is that at 7200 rpm a little dust collide with a very thin layer that contains important data will move with incredible speed and remember not bode well for the aircraft.
Why a Class 100 clean room is very important
As mentioned above, you get the small particles of dust on your hard disk, that will cause problems when the drive spins again. At home or office usually there are 500,000 to 1,000,000 particles 0.5 microns in diameter or larger per cubic meter of air ? once you have the drive to remove the cover in this environment that you are in big trouble!
A Class 100 cleanroom is an environment where there are less than 100 airborne particles (<0.5 microns in diameter) per cubic meter of air. It is in an environment where they have a hard drive built in the first place ? fully assembled and sealed to prevent dust particles can enter the unit as soon as they are shipped to retailers.
If the need for hard drive data recovery (eg swap read / write head and the change of spindle motor) to open, it should be done in a Class 100 clean room by a professional data recovery expert or run the risk of permanent damage to your data. Of course there are many examples of people on the internet that claim that they have successfully opened / repair the equipment at home, but you can bet that for every success, there may be 100 people that lost their data forever.
The point is to never open a hard drive at home, unless you can afford to have a professional who specializes in data recovery or data is not considered important enough to risk losing the lease.
Source: http://www.fcssq9.com/never-remove-the-cover-of-a-computer-hard-drive.html
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