Browse Prior Art Database

Head-Disk Assembly Cover/Disk Interface Improves Airflow

IP.com Disclosure Number: IPCOM000100548D
Original Publication Date: 1990-May-01
Included in the Prior Art Database: 2005-Mar-15
Document File: 2 page(s) / 60K

Publishing Venue

IBM

Related People

Graham, G: AUTHOR [+2]

Abstract

Disclosed is a cover/disk interface for a head-disk assembly (HDA) which improves airflow, carriage traverse and thermal interaction performance. The design is useful for enclosed HDAs with linear actuators.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 74% of the total text.

Head-Disk Assembly Cover/Disk Interface Improves Airflow

       Disclosed is a cover/disk interface for a head-disk
assembly (HDA) which improves airflow, carriage traverse and thermal
interaction performance.  The design is useful for enclosed HDAs with
linear actuators.

      In an enclosed HDA with linear actuators (see the figure), the
design of the HDA cover/disk interface is crucial in controlling the
volume and direction of air entering the actuator chamber.  Control
of the airflow is necessary for HDA cooling and filtration of
contaminants. Proper design of the interface eliminates backflow of
air from the actuator chamber to the disk chamber.  Actuator backflow
occurs when air enters the actuator chamber from the disk chamber,
mixes with actuator debris and then flows back to the disk chamber
without passing through the return filter (see the figure).  Actuator
backflow is more sensitive to the upstream geometry of the interface.
Actuator backflow is not very sensitive to the distance between the
top cover interface and upstream surface of the arms.  The critical
dimension is that between the top cover interface and the disk.

      The interface consists of two designs, one is upstream of the
arms and the other is downstream of the arms.  The downstream
geometry consists of a comb which extends between the disks.  The
comb is attached parallel to the actuator arms a small distance
downstream of the actuator arms.  The comb increases the local...