Improving hard disk drive unloading performance with a disk bump

Yonghyun Lee, Kyoung Su Park, Hyung Jun Lee, Ki Hoon Kim, No Cheol Park, Young Pil Park

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Most hard disk drives use ramp load/unload (L/UL) technology because of its many advantages. However, L/UL does have some unresolved drawbacks, such as slider-disk contact during fast unloading. The main objective of our research is to examine the use of a bump on the outer edge of the disk to prevent contact with the disk by the rebounding slider and to improve ramp unloading performance. In particular, this paper focuses on experimental verification of the design of the disk bump that resulted from our previous research. We formed the disk bump on the disk surface using mechanical pressing with tungsten tips and tested the effect of the bump in unloading experiments. An investigation of the acoustic emission burst signal and its power spectrum confirmed that the optimal disk bump prevented slider-disk contact. This improves the ramp unloading performance.

Original languageEnglish
Article number4782106
Pages (from-to)810-815
Number of pages6
JournalIEEE Transactions on Magnetics
Issue number2
Publication statusPublished - 2009 Feb

Bibliographical note

Funding Information:
This work was supported by the Korea Science and Engineering Foundation through the Center for Information Storage Mechatronics under Grant R17-2008-040-01001-0.

All Science Journal Classification (ASJC) codes

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


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