US 2022/0406333 A1 · MANAGEMENT OF ACTUATOR DYNAMICS IN A MULTIPLE ACTUATOR HARD DISK DRIVE WITH AN UNEQUAL NUMBER OF HEADS ON THE TWO OUTER ARMS OF EACH ACTUATOR

Abstract

A hard disk drive includes multiple actuator assemblies, each of which includes a head-stack assembly (HSA) including an end-arm to which a single head-gimbal assembly (HGA) is coupled, where this end-arm is configured with a notch along one side and a triangular or quadrilateral-shaped through-hole at a root-side of the end-arm, and where the HSA further includes a plurality of other end- and inner-arms to each of which two HGAs are coupled and none of which have a through-hole near their root. The single-HGA end-arm may be further configured with an outer damper having a through-hole coincident with the end-arm through-hole, such that the through-hole of the end-arm is not covered by this damper, and an inner damper having no through-hole, such that the through-hole of the end-arm is covered by this damper. Gains are thereby better matched across all HGAs for problematic arm and system modes.

Claims20

Dependent claims

A data storage device comprising:

a plurality of disk media rotatably mounted on a spindle;
a first actuator assembly comprising:
a first head-stack assembly (HSA) comprising:
an end-arm to which a single head-gimbal assembly (HGA) is coupled, the end-arm comprising a notch along one side of the end-arm of the first HSA,
a plurality of dual-HGA arms to each of which two HGAs are coupled, and
a first head slider comprising a read-write head configured to write to and to read from one of the plurality of disk media;
and
a second actuator assembly comprising:
a second head-stack assembly (HSA) comprising:
an end-arm to which a single head-gimbal assembly (HGA) is coupled, the end-arm comprising a notch along one side of the end-arm of the second HSA,
a plurality of dual-HGA arms to each of which two HGAs are coupled, and
a second head slider comprising a read-write head configured to write to and to read from another of the plurality of disk media;
wherein none of the plurality of dual-HGA arms comprise a notch configured equivalently to the notch of the end-arm of the first and second HSAs.

10 more elements

A multi-actuator hard disk drive (HDD) comprising:

a first actuator assembly comprising:
a first head-stack assembly (HSA) comprising:
a first single-HGA end-arm to which a single head-gimbal assembly (HGA) is coupled, the first single-HGA end-arm comprising a substantially triangular-shaped or substantially quadrilateral-shaped through-hole at a root-side of the end-arm,
a first dual-HGA end-arm to which two HGAs are coupled and which is configured to service a shared center disk,
a plurality of first inner-arms to each of which two HGAs are coupled;
and
a second actuator assembly comprising:
a second head-stack assembly (HSA) comprising:
a second single-HGA end-arm to which a single head-gimbal assembly (HGA) is coupled, the second single-HGA end-arm comprising a substantially triangular-shaped or substantially quadrilateral-shaped through-hole at a root-side of the end-arm,
a second dual-HGA end-arm to which two HGAs are coupled and which is configured to service the shared center disk,
a plurality of second inner-arms to each of which two HGAs are coupled;
and
an odd number of recording media, including the shared center disk shared by the first and second HSAs.

10 more elements

Dependencies are inferred from the claim text.

Management of actuator dynamics in a multiple actuator hard disk drive with an unequal number of heads on the two outer arms of each actuator

Life of this patent

Management of actuator dynamics in a multiple actuator hard disk drive with an unequal number of heads on the two outer arms of each actuator

Life of this patent

Abstract

Claims20