Experimental investigation of heat flux at the head-disk interface in hard disk drives

Yuan Ma, David B. Bogy

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

1 Citation (Scopus)

Abstract

In hard disk drives (HDDs), Thermal Fly-Height Control (TFC) is used to control the head disk spacing for reading or writing data. In order to monitor the spacing and detect possible contacts between the head and disk, a resistive temperature sensor, called Touch-Down Sensor (TDS), is embedded in the slider near potential contact points of the slider against the disk. Understanding the mechanisms of heat transfer across the headdisk interface (HDI) is of major importance, because it is closely related to the design of HDDs, including lubricant flow and contact issues, especially for Heat Assisted Magnetic Recording (HAMR) drives. In this paper, we conducted a series of experiments both on rotating and on non-rotating disks with TDS to find the cause of head temperature change and to validate the heat transfer theory based on phonon conduction. From the experiment, it is shown that air bearing cooling is not responsible for the cooling that occurs in the last nanometer before contact. Based on phonon conduction predictions, we should expect a decrease in slope of the non-contact curve as the spacing becomes less than 1 or 2 nm because of the strong increase in the heat flux due to phono conduction in this range.

Original languageEnglish
Title of host publicationASME 2016 Conference on Information Storage and Processing Systems, ISPS 2016
PublisherAmerican Society of Mechanical Engineers
ISBN (Electronic)9780791849880
DOIs
Publication statusPublished - 2016
Externally publishedYes
EventASME 2016 Conference on Information Storage and Processing Systems, ISPS 2016 - Santa Clara, United States
Duration: 20 Jun 201621 Jun 2016

Publication series

NameASME 2016 Conference on Information Storage and Processing Systems, ISPS 2016

Conference

ConferenceASME 2016 Conference on Information Storage and Processing Systems, ISPS 2016
Country/TerritoryUnited States
CitySanta Clara
Period20/06/1621/06/16

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Hardware and Architecture
  • Information Systems

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