A study of head-disk interface shock resistance

Kouhei, T.; Yamada, Takahiro; Kuroba, Y.; Aruga, K.

doi:10.1109/20.490252

Cited by 20 publications

(5 citation statements)

References 1 publication

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“…Many of these studies (Harrison and Mundt 2000;Edwards 1999;Kumar et al 1994;Kouhei et al 1995) have been limited to the nonoperating state of the drives, and/or to the component (Jayson et al 2003;Jiang et al 1995) have considered shock simulations in the operating state using simplified models for one or more components of the drive, i.e. either the disk, suspension or the air bearing.…”

Section: Prior Workmentioning

confidence: 99%

Effect of shock pulse width on the shock response of small form factor disk drives

Bhargava

Bogy

2007

Microsyst Technol

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This paper discusses the effect of varying the shock pulse width on the shock response of small form factor hard disk drives. We develop a new shock simulator for hard disk drives which simulates the structural as well as the air bearing dynamics of the disk drive simultaneously. We observe that the response of the disk to the shock pulse is of critical importance and depends strongly on the pulse width of the shock pulse. We also find that if a suspension bending frequency is close to the first umbrella frequency of the disk, there can be failure of the headdisk interface due to resonance.

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Section: Prior Workmentioning

confidence: 99%

Effect of shock pulse width on the shock response of small form factor disk drives

Bhargava

Bogy

2007

Microsyst Technol

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“…Jayson et al (2003a) studied the ''head slap'' behavior during non-operational conditions for linear and rotary shock inputs. Kouhei et al (1995), Ishimaru (1996), and Kumar et al (1994) have investigated the ''head slap'' phenomenon experimentally for non-operational shock. Lee et al (2001) developed a theoretical model to investigate head slap quantitatively and design a shock resistant suspension by using Hamilton's principle to formulate the equations of motion.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation of shock response in 3.5 and 2.5 in. form factor hard disk drives

et al. 2006

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The shock performance of the head/disk interface (HDI) of 3.5 and 2.5 in. hard disk drives (HDDs) is investigated. The displacement of the actuator arm, the suspension, and the disk due to linear shock loads is studied experimentally for both non-operating and operating states of the disk drive. A finite element model of the disk drive was developed to simulate the shock response. Numerical simulation results and experimental results are compared and presented.

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“…Ishimaru (1996) demonstrated that damage was independent of the resonance frequency of the disk and that a shock acceleration with a duration of about 1.5 times as long as half the natural period of the head-arm assembly brought the largest collision velocity of the head-actuator assembly. Kouhei et al (1995) used a still camera with a stroboscope to observe the behaviors of the slider and the suspension under an external shock, and used the Hertz contact stress formula with energy conservation to explain the relationship between the disk failure and slider dynamics.…”

Section: Introductionmentioning

confidence: 99%

Shock effects on the performance of the interface between the moving suspension lift-tab and the ramp in a load/unload drive

Shao

et al. 2009

Microsyst Technol

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The bouncing behavior of the suspension lifttab at the tab-ramp interface during the unloading process of a hard disk drive subject to external shocks was studied by using a lumped-parameter dynamic model with one degree of freedom in a moving reference frame. A finite element model of the hard disk drive was used to generate the data as input to the lumped-parameter model. This simulation scheme allows easy examination of the effects of individual contributing factors. The effects of the peak acceleration of the external shock pulse, the pivot hub motion, the air bearing suction force and the disk motion on the bouncing characteristics of the lift-tab were studied by evaluating the bouncing distance and bouncing height of the lift-tab as well as the indentation depth at the tab-ramp interface. The simulation results indicate a different behavior of the suspension close to the base plate (B) compared to that close to the cover (C). The bouncing distance and bouncing height were larger for Suspension C compared to Suspension B. For the latter, the motion of the pivot hub is an important contributing factor to the bouncing distance and bouncing height. Moreover, the indentation depth increases significantly with increasing peak acceleration. For suspension C, both the bouncing distance and the bouncing height increase almost linearly with increasing peak acceleration. The vibration of the disk changes the dimple separation height and the air bearing force during an unloading process, thus affecting the bouncing behavior of the lift-tab. The effect of the suction force on the bouncing of the lift-tab is coupled with the disk position. When the lift-tab exceeds the dimple separation height for a disk raised relative to its original position, the suction force can decrease the bouncing height of the lift-tab significantly, compared to the condition without a suction force.

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A study of head-disk interface shock resistance

Cited by 20 publications

References 1 publication

Effect of shock pulse width on the shock response of small form factor disk drives

Effect of shock pulse width on the shock response of small form factor disk drives

Experimental and numerical investigation of shock response in 3.5 and 2.5 in. form factor hard disk drives

Shock effects on the performance of the interface between the moving suspension lift-tab and the ramp in a load/unload drive

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