NDLI: Drive level acoustic defectoscopy for head disc interface (HDI) integration and manufacturing

Content Provider	Springer Nature Link
Author	Daugela, Antanas Tadepalli, Srinivas
Copyright Year	2012
Abstract	A short product development cycle for modern hard disc drive (HDD) depends entirely on early defect characterization. However, deviations from desired HDI mechanical performance are not always manifested in electromagnetic read back or servo control signals. The best non-destructive tool to monitor HDI dynamics at the HDD level is a passive acoustic technique that tracks equilibrium of the head gimbal assembly and air bearing (AB) modes. This technique is capable of active head protrusion detection as well as detection of embedded particles. The drawback of the passive acoustic monitoring technique at drive level is that a noisy HDD environment makes the detectability of a useful signal challenging. The proposed HDD level in situ passive HDI acoustic monitoring technique consists of external AE sensors driven by adequate electronics. These are enhanced by advanced signal processing routines that include adaptive discrete wavelet transforms. The system is tuned to monitor acoustic HDI signatures during drive spin-up/spin-down cycles as well as during passive and active height across the data zones. In addition, integrated acoustic energy metrics can be used in AB design evaluation stages. In this work examples of HDD level passive acoustic monitoring applications for HDI development, and manufacturing defect tracking, are presented and supported by failure analysis results.
Starting Page	1425
Ending Page	1430
Page Count	6
File Format	PDF
ISSN	09467076
Journal	Microsystem Technologies
Volume Number	18
Issue Number	9-10
e-ISSN	14321858
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-06-15
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Mechanical Engineering Electronics and Microelectronics, Instrumentation Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering Hardware and Architecture

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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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Ultra sensitive in-situ acoustic characterization system for HDD head disc interface defectoscopy

Passive acoustic monitoring of head disc interface interactions

Parameter sensitivity analysis of disk drive head load control system

Frictional heating effect on thermal protrusion in head disk interface

Hard-particle-induced physical damage and demagnetization in the head-disk interface

Numerical investigation of thermal effects on a HAMR head-disk interface

Approaches to reduce effect of short-range interactions in head disk interface

Dynamics of head-disk interface in hard disk drives during operational shock

Fluorine-ion-implanted air-bearing surface for low-friction head–disk interface

Drive level acoustic defectoscopy for head disc interface (HDI) integration and manufacturing

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