Thermal asperity trends

Stupp, S.E.; Baldwinson, M.A.; McEwen, P.A.; Crawford, Tryston; Rogers, Charles T.

doi:10.1109/20.750640

Cited by 31 publications

(18 citation statements)

References 6 publications

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“…We compute the BER of the system based on a minimum number of 500 4096-bit data sectors and 500 error bits, and call that number as "BER given TA." This paper compares the performance of the proposed TA suppression method with that of the methods proposed in [2] and [6]. The method presented in [2] is denoted as "Method 1" and that presented in [6] is referred to as "Method 2."…”

Section: Numerical Resultsmentioning

confidence: 99%

“…This paper compares the performance of the proposed TA suppression method with that of the methods proposed in [2] and [6]. The method presented in [2] is denoted as "Method 1" and that presented in [6] is referred to as "Method 2." Because the perpendicular recording channel contains a d.c. component, we propose a bandpass filter G(D) of the form ( ) ( ) ( )…”

Section: Numerical Resultsmentioning

confidence: 99%

“…3, the proposed method using G(D) with parameter i ≥ j (specifically, G 1 (D) and G 3 (D)) performs better than other methods. In addition, the proposed method using G 3 (D) = (1+D) 2 (1-D) provides a lower BER than that using other G(D)'s. This is because a bandpass filter G 3 (D) can capture most energy of the readback signal as illustrated in Fig.…”

Section: A Uncoded Systemsmentioning

confidence: 94%

“…The proposed method is developed from the TA suppression methods presented in [2] and [6]. Specifically, the proposed method employs two VDs running in parallel as illustrated in Fig.…”

Section: Proposed Algorithmmentioning

confidence: 99%

“…Practically, the TA signal described by Stupp et al [2] has a short rise time (50 -160 ns) with a long decay time (1 -5 μs), and its peak TA amplitude could be 2 -3 times the peak of the readback signal [2,3]. If precautions are not taken, the TA effect can cause a burst of errors in data detection, which could easily exceed the correction capability of the errorcorrection code (ECC), and thus results in a sector read failure.…”

Section: Introductionmentioning

confidence: 99%

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The effect of bandpass filters for thermal asperity suppression in perpendicular recording systems

Koonkarnkhai

Kovintavewat

Keeratiwintakorn

2009

2009 6th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technolog

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Abstract-Thermal asperity (TA) causes a crucial problem in magnetic recording systems because it can distort the readback signal to the extent of causing possible sector read failure. This problem becomes more severe in perpendicular recording channels because these channels contain a d.c. component. This paper presents a novel TA suppression method by use of a bandpass filter. We also investigate the effect of different bandpass filters for TA suppression. Results indicate that the proposed TA suppression method using a bandpass filter polynomial G(D) = (1+D) 2 (1-D) yields lower bit-error rate than the existing ones, and is robust to large peak TA amplitudes.

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Section: Numerical Resultsmentioning

confidence: 99%

Section: Numerical Resultsmentioning

confidence: 99%

Section: A Uncoded Systemsmentioning

confidence: 94%

“…The proposed method is developed from the TA suppression methods presented in [2] and [6]. Specifically, the proposed method employs two VDs running in parallel as illustrated in Fig.…”

Section: Proposed Algorithmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The effect of bandpass filters for thermal asperity suppression in perpendicular recording systems

Koonkarnkhai

Kovintavewat

Keeratiwintakorn

2009

2009 6th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technolog

View full text Add to dashboard Cite

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Measurements of particle size distribution and average particle charge in operating a hard disk drive

Lee

Park

et al. 2005

Microsyst Technol

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As the flying height of a slider in a hard disk drive decreases, the slider and disk are more likely to come into contact and generate contamination particles. Since particle contamination can cause serious problems including thermal asperity, it must be prevented to increase storage capacity. In this work, first we measured the size distribution of the particles according to the disk rotational speed by using an APS (aerodynamic particle sizer) and DMA (differential mobility analyzer)-CPC (condensation particle counter). The results showed that mainly submicron particles were generated and particle generation rate increased as the disk rotational speed increased. Then, the electrical current due to particle charge was measured by a Faraday cup. Calculated from experimental data, the average number of elementary charges per particle was from 1.9 to 5.2, and it decreased as the disk rotational speed increased. Finally, SEM (scanning electron microscopy) images of particles were obtained by using a particle sampler designed in our laboratory. With these images, we were able to verify the relation between particle generation rate and disk rotational speed.

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