The pulse width effect on the shock response of the hard disk drive

Luo, Jun; Shu, Dongwei; Shi, Baohui; Gu, Bin

doi:10.1016/j.ijimpeng.2006.07.005

Cited by 14 publications

(6 citation statements)

References 8 publications

(8 reference statements)

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“…They derived the governing equation for the voice coil motor-head actuator assembly system using a Lagrangian formulation and obtained the shock response of the hard disk drive by including the constraint equations between the slider and the disk surface. Luo et al (2007) found that the lift off height of the slider reaches a peak value as a function of pulse width. Shi et al (2006) considered a head actuator arm model to analyze the deflection of the tip of the arm relative to the pivot for various input pulse shapes and correlated their experimental results with predictions from numerical simulations.…”

Section: Introductionmentioning

confidence: 98%

Effect of suspension design on the non-operational shock response in a load/unload hard disk drive

Zheng

Murthy

Fanslau³

et al. 2009

Microsyst Technol

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Hard disk drives must be designed to be resistant to operational and non-operational shock (Jayson et al. in IEEE Trans Magn 38(5):2150-2152, 2002. Numerical and experimental results show that ''lift-tab separation'' and ''dimple separation'' are two possible failure modes of presently used head suspension assemblies (Murthy in Ph.D. thesis, Center for Magnetic Recording Research, University of California, San Diego, 2007). In addition, ''dimple and tongue wear'' at the interface of gimbal and dimple are areas of concern in the design and operation of high performance suspensions during shock. In this investigation, an improved numerical model for non-operational shock response of a load/unload hard disk drive is implemented by including design parameters of suspension such as dimple preload, suspension material, dimple height and the surface diameter of the dimple in the model. Results for dimple and lift-tab separation, as well as the maximum impact stress at the dimple region, as a function of preload and suspension design parameters, will be presented.

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Section: Introductionmentioning

confidence: 98%

Effect of suspension design on the non-operational shock response in a load/unload hard disk drive

Zheng

Murthy

Fanslau³

et al. 2009

Microsyst Technol

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“…Some scholars believe that the mechanism of improvement is due to the existing ball bearing effect between the spherical nanodiamond and the Sn plate, where rolling and gliding friction coexist. The nanodiamonds can significantly increase lapping endurance and reduce the friction effect [ 26 , 27 ]. Other researchers believe that the improved performance is due to the existing boundary lubrication among the nanodiamonds, the magnetic heads, and the oil, all of which greatly reduce friction [ 28 ].…”

Section: Introductionmentioning

confidence: 99%

Mechanistic Features of Nanodiamonds in the Lapping of Magnetic Heads

Jiang

Chen

Wolfram

et al. 2014

The Scientific World Journal

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Nanodiamonds, which are the main components of slurry in the precision lapping process of magnetic heads, play an important role in surface quality. This paper studies the mechanistic features of nanodiamond embedment into a Sn plate in the lapping process. This is the first study to develop mathematical models for nanodiamond embedment. Such models can predict the optimum parameters for particle embedment. From the modeling calculations, the embedded pressure satisfies p 0 = (3/2)·(W/πa 2) and the indentation depth satisfies δ=k1P/HV. Calculation results reveal that the largest embedded pressure is 731.48 GPa and the critical indentation depth δ is 7 nm. Atomic force microscopy (AFM), scanning electron microscopy (SEM), and Auger electron spectroscopy (AES) were used to carry out surface quality detection and analysis of the disk head. Both the formation of black spots on the surface and the removal rate have an important correlation with the size of nanodiamonds. The results demonstrate that an improved removal rate (21 nm·min−1) can be obtained with 100 nm diamonds embedded in the plate.

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“…The mechanical components of microdrives become very delicate, and a better understanding of their dynamic property is essential [1][2][3]. Figure 1 shows a photograph of a I-inch microdrive with major components / assemblies annotated and its top cover removed.…”

Section: Introductionmentioning

confidence: 99%

Design considerations for reducing shock responses of a micro-drive

Shi

Shu²,

Gu³

2009

2009 Asia-Pacific Magnetic Recording Conference

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Based on the operational shock simulation of the head disk assembly (HDA) of a micro-drive, we proposed three possible approaches for reducing the shock responses. These approaches are, 1) to change the Young's modulus, 2) to change the thickness of the hinge, and 3) to change the boundary condition of the disk. Numerical results show that the third approach with a clamped boundary condition for the disk produces the most significant effect on reducing the shock responses.

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The pulse width effect on the shock response of the hard disk drive

Cited by 14 publications

References 8 publications

Effect of suspension design on the non-operational shock response in a load/unload hard disk drive

Effect of suspension design on the non-operational shock response in a load/unload hard disk drive

Mechanistic Features of Nanodiamonds in the Lapping of Magnetic Heads

Design considerations for reducing shock responses of a micro-drive

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