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Browse Prior Art Database

Dual Actuators for Magnetic Disk Drives

IP.com Disclosure Number: IPCOM000103361D
Original Publication Date: 1990-Oct-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 1 page(s) / 43K

Publishing Venue

IBM

Related People

Keller, CG: AUTHOR [+2]

Abstract

A method to increase the number of disks in a disk drive with dual actuators while maintaining the same height of the drive is disclosed.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Dual Actuators for Magnetic Disk Drives

      A method to increase the number of disks in a disk drive with
dual actuators while maintaining the same height of the drive is
disclosed.

      The drive shown in the figure has two actuators 1,2, one of
which has heads 5 that are on the odd numbered disks 3 and the other
2 has heads on the even numbered disks 4.

      This disclosure has advantages over an alternate method of
achieving similar results, the method with one actuator having all
the up-looking heads and the other having all of the down-looking
heads.  In the disclosed method, there are no moments on the actuator
and spindle bearings.  In the alternate method, there are always
moments on the bearings, the actuator bearings have a constant moment
of the head load times the distance of the head to the pivot times
the number of heads per actuator.  The spindle bearing moments are
worse because they are variable and both actuators cause moments in
the same direction.  Another advantage is that each disk has heads
straight through from each other eliminating disk deflection caused
by uneven loading of the disk.  Uneven loading can cause resonance
problems in the disk inducing flyheight modulation which effects the
ability to read and write data.

      Disclosed anonymously.