thank you for your email.
Regarding your enquiry relating to the brief sound that emanates from our
drives.
I suspect that the occasional 'sound' you are hearing is the Idle Time
Function that has been introduced on our latest drive designs as a
reliability enhancement. You need not be alarmed by this,
This "sound" is due to a brief but deliberate head arm movement every so
often. This has been added to maximise the reliability of our disk drive
products.
This function is invoked if an extended period of inactivity is detected,
so has no impact on active performance. [It is bad to leave the heads
hovering over the same data track unnecessarily].
Even after a period of time of activity the Idle Time Function can be
implemented as the Idle Time Function is a cumulative function.
The level of sound emitted may vary from one drive to another and as such
this should not give rise to concern or be considered an impending failure.
Please be assured that this drive design is one of the quietest drives, at
this data density, in the industry.