Method of estimating a thermal pole tip protrusion for a...

Details Method of estimating a thermal pole tip protrusion for a... Method of estimating a thermal pole tip protrusion for a...

Filed on

2006-08-15

Date issued

2006-08-15

Examiner

Kim, Paul D. (Department: 3729)

Patent Class

Metal working

SubClass

Method of mechanical manufacture

SubSubClass

Electrical device making

Other Related Categories

C029S603030, C029S603040, C029S603050, C029S603070, C360S031000, C360S097010, C360S234500, C360S244000, C360S245000, C360S294400

Type

Reexamination Certificate

Status

active

Patent number

07089649

Description

ABSTRACT:
Thermal pole tip protrusion is caused by materials in and around head slider expanding during write operations till they protrude, leading to contact with the rotating disk surface, altering the flying height and often wearing down part of the disk surface. While well known that read-write heads expand during writing, the inventors who recognized this situation's significance, particularly as flying height decreases and data rates increase, both required for high areal density disk drives. The inventors realized that they could detect the problem at the spin stand level by testing head gimbal assemblies to reliably, and inexpensively, predict the tendency for thermal pole tip protrusion. This leads to selection of head gimbal assemblies, which do not have the thermal pole tip protrusion tendency. The selected head gimbal assemblies have better reliability, as do actuators and disk drives made with the selected head gimbal assemblies.

REFERENCES:
patent: 6105381 (2000-08-01), Ghoshal
patent: 6760182 (2004-07-01), Bement et al.
patent: 6813118 (2004-11-01), Pust et al.
patent: 6859343 (2005-02-01), Alfoqaha et al.
patent: 2003141704 (2003-05-01), None
“Thermomechanical head performance”; Pust, L.; Rea, C.J.T.; Gangopadhyay, S.; Magnetics, IEEE Transactions on , vol. 38 , Issue: 1 , Jan. 2002; pp. 101-106.

Affiliated with

Also associated with

Rating

Method of estimating a thermal pole tip protrusion for a... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of estimating a thermal pole tip protrusion for a..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of estimating a thermal pole tip protrusion for a... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3617162