A novel laser bump design for low glide/low stiction disk

Abstract

The effects of different geometry of the laser bump in contact start/stop (CSS) and glide avalanche performance were investigated. Traditionally, a lower laser bump height can reduce the glide avalanche, but if the height is lower than a specific value there will appear a ''stiction barrier''. In order to overcome this barrier, a novel design of obtaining cavities on the disk is proposed. In this design, changing the depth and relative position of the laser bump can obtain a lower stiction and glide avalanche. The effects of lubricant film thickness and environmental temperature/humidity were also observed.

Improving Hard Disk Drive Unloading Performance With a Disk Bump

“…The laser beam method is widely used to make disk bumps, and there has been much research into using this method [9]- [11]. However, we used mechanical pressing because of the bump dimensions required.…”

Laser generation of elliptical nanometre and sub-nanometre bump arrays on NiP/Al data storage disks and their effect on stiction performance

“…This is known as the stiction force, which in a hard disk must be very low so that the head slider can fly smoothly during takeoff and landing operations without damaging the disk and the head. This value strongly depends on the texture characteristics of the landing zone such as bump shape, diameter, height and distribution [6,7]. Another tribological parameter that must be considered is the wear of the head-disk interface (HDI).…”

“…Hard disk laser texturing at the nanometre scale has been successfully demonstrated by various authors [1,7,[9][10][11][12]. Nevertheless, a particular type of nano-bump with an asymmetric profile has also been generated on a NiP/Al substrate.…”