by Dmitry Postrigan
Hard drives are built in a way so that they never return unreliable data. This means that if a hard drive cannot guarantee 100 percent accuracy of the data requested, it will simply return an error and will never give away any data at all. This article explains how bad sector recovery actually works and why it needs to be done with great caution. General causes of bad sector formation are physical or magnetic corruption. Physical corruption is easy to understand—it occurs when there is physical damage done to the media surface. Magnetic corruption occurs when a hard drive miswrites data to a wrong location. While the latter may seem to be less damaging, it is actually as dangerous as physical damage, as miswritten data may damage not only adjacent sectors but also servo sectors…
