Advanced unloading analysis considering lateral velocity and disk RPM drop in emergency parking

Yonghyun Lee, Ki Hoon Kim, Seokhwan Kim, No Cheol Park, Young Pil Park, Kyoung Su Park, Cheol Soon Kim, Jingyoo Yoo

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

A conventional unloading analysis was carried out in no consideration for fast lateral velocity and disk rpm drop during the emergency parking. However, current hard disk drive (HDD) systems need an improved performance in the portable aspect. Therefore, much faster emergency parking is absolutely necessary to protect the system from sudden power-off or an external shock. In case of fast emergency parking, the fast lateral velocity causes an effective skew, and then there is a flying height (FH) loss which does not occur in a normal unload. Also, the FH loss induced by a disk rpm drop occurs at an unloading point in case that a portable small form factor HDD like 1.8 in is suddenly parking from inner diameter to outer diameter. This means that the unloading performance considering the effective skew becomes lower than one of the conventional unloading analysis. In this paper, we propose the advanced unloading analysis that can be applied to the fast emergency parking velocity. To do so, we investigate the FH loss by the fast lateral velocity and the disk rpm drop, and introduce the result of the advanced unloading analysis.

Original languageEnglish
Article number5297532
Pages (from-to)4937-4940
Number of pages4
JournalIEEE Transactions on Magnetics
Volume45
Issue number11
DOIs
Publication statusPublished - 2009 Nov 1

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Parking
Unloading
Hard disk storage

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

Cite this

Lee, Yonghyun ; Kim, Ki Hoon ; Kim, Seokhwan ; Park, No Cheol ; Park, Young Pil ; Park, Kyoung Su ; Kim, Cheol Soon ; Yoo, Jingyoo. / Advanced unloading analysis considering lateral velocity and disk RPM drop in emergency parking. In: IEEE Transactions on Magnetics. 2009 ; Vol. 45, No. 11. pp. 4937-4940.
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Advanced unloading analysis considering lateral velocity and disk RPM drop in emergency parking. / Lee, Yonghyun; Kim, Ki Hoon; Kim, Seokhwan; Park, No Cheol; Park, Young Pil; Park, Kyoung Su; Kim, Cheol Soon; Yoo, Jingyoo.

In: IEEE Transactions on Magnetics, Vol. 45, No. 11, 5297532, 01.11.2009, p. 4937-4940.

Research output: Contribution to journalArticle

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