Design and analysis of disk bump to improve the unloading performance in hard disk drives

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

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Most hard disk drives that apply the ramp load/unload technology unload the heads at the outer edge of the disk while the disk is rotating. During the unloading process, slider-disk contacts may occur by lift-off force and rebound of the slider. The main issue of this paper is to prevent the slider-disk contact by rebound, and we apply a disk bump to the unloading process. To do so, first, the ranges of bump dimension are determined. Second, the stability of each bump is checked by dynamic simulation. Finally, unload analyses are performed for stable bump designs. As a result of these analyses, we investigate proper bump design and position for the unloading process. Through this research, we propose the optimal bump design to improve the unloading performance. We can also identify to remove rebound contact by applying a bump on disk to the unloading process.

Original languageEnglish
Pages (from-to)3744-3749
Number of pages6
JournalIEEE Transactions on Magnetics
Issue number9
Publication statusPublished - 2007 Sept

Bibliographical note

Funding Information:
This work was supported by the Center for Information Storage Device (CISD) at Yonsei University, Seoul, Korea.

All Science Journal Classification (ASJC) codes

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


Dive into the research topics of 'Design and analysis of disk bump to improve the unloading performance in hard disk drives'. Together they form a unique fingerprint.

Cite this