Vibration analysis of the platter and the spindle assembly of hard disk drive : a thesis submitted to the faculty of Massey University in partial fulfilment of the requirements for the degree of Master of Engineering in Mechatronics
As the demand for higher data transfer rate in a hard disk drive (HDD) has increased, faster
rotational disk speed has been imposed. Unfortunately, higher rotational disk speed leads to
higher vibration and that leads to high frequent track misregistration (TMR). In order to
solve this problem, a new damping system has been suggested that will help to reduce
vibration in high speed hard disk drives.
The thesis contains a detailed study of vibration and its types. Causes of vibrations have
been discussed too.
The thesis also contains a study of vibration and its effects on rotating disc such as HDD
Platter. Detailed vibration analysis was performed on the HDD platter and spindle-assembly
so that natural frequencies of all vibrational modes can be calculated.
Research includes, the thermal analysis of spindle disk assembly used in computer hard disk
with new design approach of spindle to minimize the repeatable run-out (RRO) of track
following position error signal (PES) in high track per inch (TPI) disk drives.
The thesis proposed a simple but analytical approach for the design of HDD enclosure with
different sector shapes and for the spindle motor with different slot/notch angles, based on
the analysis and simulation results.
Based on the simulation and experimental results, the proposed method can be introduced
as a very promising tool for the design of HDDs and various other high performance
computer disk drives such as floppy disk drives, CD ROM drives, and their variations having
spindle mechanisms similar to those of HDDs.