Why Does a Hard Drive Click?
To understand why a hard drive makes a clicking noise, you have to understand a disk read/write head. The read/write head hovers over a hard drive’s platters, and quickly scans across a platter either adding data to the platter or reading from it. In the event that damage is done to the platters, such as a head crash (the read/write head comes into contact with the platters, damaging them), the read/write head is unable to perform its tasks. This causes it to move back to its original position and try to locate the right position on the platters again – all in a very fast process. Occasionally, the read/write head will reach the end of the platter and hit a stop, resulting in the audible click sound that we recognize.