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# "Go Home" Method Using Friction Force Between Head And Disk

IP.com Disclosure Number: IPCOM000119947D
Original Publication Date: 1991-Mar-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 3 page(s) / 68K

IBM

## Related People

Kitahori, H: AUTHOR [+3]

## Abstract

Disclosed is a method which makes a head go home by determining a rotation center of an actuator and using a friction force between the head and a disk.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 92% of the total text.

"Go Home" Method Using Friction Force Between Head And Disk

Disclosed is a method which makes a head go home by
determining a rotation center of an actuator and using a friction
force between the head and a disk.

In the current hard disk drive, a head flies on the disk
surface because air between the head and the disk makes the head fly
(Fig.1).

When power is off, the head touches the disk surface because
the air between the head and disk decreases, and finally the head
stops on the disk surface at some location (Fig. 2).  It needs some
mechanism to move the head to a specific area (referred to as the
"landing area").

The new method disclosed herein does not need an additional
mechanism for stopping the head in the specific area.  The method
uses a friction force between the disk and the head.

The friction force between the head and the disk works for a
few minutes until the head contacts the disk surface completely.  The
direction of the friction (F) is the tangential direction for the
circle of the disk center (Figs. 3 and 4).  The friction (F) is
divided into two components.
Fr : a force to move actuator
Fl : a vertical force for F

The force Fr is determined by the relation between the contact
position of the head and the disk and the position of the center of
actuator rotation.  Therefore, if the position of the center of the
actuator rotation is determined so...