Corruption of the SA Modules
The clicking sound does not always mean that the magnetic read/write heads assembly has a major mechanical problem and needs to be replaced. Damaged firmware modules of a hard drive can cause such easily audible sounds. To explain it in simple words, magnetic heads when they float over the platter surface by the command of PCB are looking for special data on that surface to match up with. If the critical firmware modules are damaged, the heads will go on searching for the data on the location called Service Area and cause clicking sounds. Of course, this fact does not necessarily indicate that the problem is less severe and easily fixable. Certain parts of the modules have to be repaired to start the data recovery phase.