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HIGH PERFORMANCE DISK DRIVE WITH NON-REDUNDANT DUAL ACTUATORS

IP.com Disclosure Number: IPCOM000013223D
Original Publication Date: 2000-Apr-01
Included in the Prior Art Database: 2003-Jun-18
Document File: 2 page(s) / 87K

Publishing Venue

IBM

Abstract

Figure 1: 3.5 inch form factor disk drive with 65mm outer diameter disks and dual actuators.

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HIGH PERFORMANCE DISK DRIVE WITH NON-REDUNDANT DUAL ACTUATORS

Figure 1: 3.5 inch form factor disk drive with 65mm outer diameter disks and
dual actuators.

Described is a dual actuator disk drive where each of the two actuator assemblies
and voice coil motor assemblies are of similar design but located at
substantially 180 degree position difference with respect to the rotating
position of the disks (see Figure 1). Patents US5223993, US5293282 and US5343347
have shown dual actuator designs where there are two read/write heads that
service a single disk surface. These have been proposed primarily to reduce
access time via reduced actuator move time and reduced rotational latency.
However, since read/write heads contribute significantly to disk drive cost,
doubling the number of read/write heads is not cost effective. In the present
design, only one read/write head services any one corresponding disk surface. In
this way there is no redundancy of two or more read/write heads servicing any
single disk surface. The advantage is improved actuator dynamics, reduced
actuator inertia, and smaller disk to disk spacing, by having only one
read/write head suspended on any one actuator arm.

In this design, the non redundancy of read/write heads per disk surface can be
achieved in one of two ways: 1) by one actuator servicing all bottom disk
surfaces and the opposing actuator servicing all top disk surfaces, or 2) by
having two identical actuator assemblies with pairs of arms (each arm with
sus...