US 12,148,456 B2 · Split actuator drive that limits slew rate of aggressor VCM to reduce victim disturbances

Abstract

A seek operation of a first actuator in a multi-actuator drive is modified, so that one or more disturbance-generating portions of the seek operation do not adversely affect operation of a second actuator in the drive. Radial motion of the aggressor actuator is controlled by limiting a slew rate of the first actuator during one or more portions of the seek operation to be less than or equal to a threshold value. Because slew rate of the first actuator is the rate of change of radial acceleration of the aggressor actuator with respect to time, limiting the slew rate of the first actuator prevents or reduces mechanical disturbances caused by jerk associated with motion of the first actuator.

Claims16

Dependent claims

A method of performing a seek operation in a split actuator drive, wherein the split actuator drive includes first and second actuators, wherein the first actuator is coupled to a head and is controlled by a first controller in accordance with a parameter for a target radial velocity for the head, the method comprising:

initiating a seek operation with the first actuator;
and
while the head is accelerating, setting the parameter to a first target radial velocity at a first timing and to a second target radial velocity that is greater than the first target radial velocity at a second timing that is after the first timing,
wherein setting the parameter to the first target radial velocity causes the head to accelerate by a first acceleration value, and setting the parameter to the second target velocity causes the head to accelerate by a second acceleration value that is less than the first acceleration value.

1 more element

Dependencies are inferred from the claim text.

Facts

Application

18/190,495Filed 27 Mar 2023 · continuation

Priority

27 Aug 2021

Published

US 2023/0061685 A127 Jul 2023

Granted

19 Nov 2024

Term ends

Not estimatedThe source records don’t support an estimate.

Classification5 codes

G11B 5/5547
Details: "Seek" control and circuits therefor
G11B 25/043
Using flat record carriers, e.g. disc, card: using rotating discs
G11B 5/4813
Specially adapted for disk drive assemblies, e.g. assembly prior to operation, hard or flexible disk drives: mounting or aligning of arm…
G11B 15/473
In arrangements for recording or reproducing wherein both record carriers and heads are driven: by controlling the speed of the heads

Family

Application17/459,222Parent of this continuation · filed 27 Aug 2021

US 2023/0238024 A1Pre-grant publication · published 27 Jul 2023

US 11,615,811 B2Parent of this continuation

US 2023/0061685 A1Published application

US 12,148,456 B2This patent

From the US filing history. Foreign family members aren’t listed.

Split actuator drive that limits slew rate of aggressor VCM to reduce victim disturbances

Life of this patent

Split actuator drive that limits slew rate of aggressor VCM to reduce victim disturbances

Life of this patent

Abstract

Claims16