Current Innovations for Solving Hard Disk Drive Vibration Problems - IT Assignment Help

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Evaluation of Current Innovations for Solving Hard Disk Drive Vibration Problems

Introduction Vibration is a very big disadvantage in hard disk drives (HDD) due to the rotational movement of the platters (spinning disk). HDD are even subjected to more rigorous, harsh and more intense conditions in present days, users demand for even faster and high performance HDD have also lead developers into pushing the boundaries of tackling the vibration issues with the HDD. Kirpekar and Bogy (2008) explained that the need for faster data transfer rates has led to an increase in rotational speed of the spinning disk in HDD, however it isn?t the dynamic stability of the HDD that is the only concern, vital and delicate parts of most modern day HDD such as the Read-Write head are positioned only inches away from the rotating disks by means of airbearing sliders which are detrimental to the accurate positioning of the read–write head on data tracks. Shen (2000) proposed developing alternative substrate materials for the disks such as ceramic with extremely high stiffness to reduce the vibration amplitude and also increase resonance to higher frequency. Kameya et. al. (2012) also proposed the use of laminated disks consisting of a viscoelastic polymer core sandwiched between two aluminum disks, during rotation the viscoelastic polymer undergoes a distributed form of deformation because the stiffness of the polymer is much less than that of the aluminum disks. Further research has also being done towards vibration problems such as Jintanawan (2009) explaining hard disk vibration energy being converted to acoustic noise and the thorough understanding of such noise generating mechanism can improve in the design for better HDD. Sibielak (2012) also claimed using piezoelectric elements which results in high resolution rotation causing no friction. In this paper I will critically analyze various academic journals focusing on hard disk vibrational problems, methods that have been proposed towards mitigating the vibration issues and also experiments used to back up their claims and how their experiments are being evaluated in order to achieve the most effective solution.

.Evaluating Researches On Vibration Problem The rotation of the spinning disk in a HDD is the root cause of the internal vibration problems of HDD. Horowitz et. al. (2007) proposed two innovations to be implemented in the near future in order to increase the storage density of HDD, the first is the use of high bandwidth dual-stage actuator servo system so as to improve the precision and track-following capability of the read/write head of the HDD and secondly The second is the instrumentation of the HDD suspensions with vibration strain gage sensors, so as to improve airflow induced suspension vibration suppression in the HDD. Majority of the researches on HDD vibration problems are focused on internal vibrational problems and little 2 research is being made towards external vibration problems which are even more unpredictable because of the evolution of technology. Appliances are now being made portable and taken into extremely rugged environments, external forces can also be a big problem to most of the best HDD vibration problems out there. Yap et.al. (2006) explained the importance of an external vibration isolation system of an HDD as not being stressed enough because HDD are being used under even more rugged circumstance in this new age, their procedures for testing vibration and their means of evaluation where documented and presented. Hoque et.al. ( 2010) claimed that passive techniques such as passive damping and isolation are mostly used in many applications but are extremely limited because the isolation elements need to be soft enough to absorb vibration and stiff enough to prevent on-board generated direct disturbances. Choi and Yoon (2011) also claimed that applying herringbone groove pattern to the dampers of an HDD can reduce the axial vibration of the disk rotating at high speed.

(2006) also claimed that the best standard of vibration isolation should be between 10Hz to 20Hz and their prototype fulfills all the necessary criteria to be confirmed successful. This research paper is focusing on external HDD vibration isolation which also included the military standard 810E method. They initially experimented on a HDD without vibration isolation in order to get an acceptable limit, the purpose of this experiment to ensure the acceleration response of the vibration isolation prototype is lower than the acceptable limits. Two experiments were conducted in this research which will be analyzed below to see what kind of experiments was conducted and how they were evaluated to back up their claims. Experiment1 where Yap et.al. (2006) developed an external vibration isolation prototype and conducted an experiment known as the vibration testing and evaluation criteria, in this case the HDD was tested using random-on-random vibration signals according to military standard 810E. Vibration signals are generated to the controller, by this way the controller is connected to an electrodynamics shaker to physically produce the random-on-random vibration to the prototype analysis was made while this experiments was undertaken and data was taken as results and then graphed and was also evaluated in two different ways so as to confirm consistency. Firstly Yap et.al. (2006) evaluated the first experiments by streaming movie data (audio and video) from the hard disk drive during the vibration test, the evaluation is said to be successful if there are no pauses in the movie while being played continuously during the vibration test. Secondly Yap et.al. (2006) also evaluated the first experiment by recording real time data to the HDD during vibration test with constant transfer rate, this evaluation is said to be successful if the desired data recording rate can be maintained without los

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