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Compensatory Element for Preventing Thermally Induced Warping Between The Actuator Axis And Media Axis of Rotation in a Hard File Memory

IP.com Disclosure Number: IPCOM000101046D
Original Publication Date: 1990-Jun-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 3 page(s) / 114K

Publishing Venue

IBM

Related People

Siverling, MM: AUTHOR

Abstract

Illustrated in Figs. 1 and 2 is a remedial appliance for thermally caused misalignment of an actuator axis or tower 10 and a storage disk spindle or axis 12 in a computer file memory.

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Compensatory Element for Preventing Thermally Induced Warping Between The Actuator Axis And Media Axis of Rotation in a Hard File Memory

       Illustrated in Figs. 1 and 2 is a remedial appliance for
thermally caused misalignment of an actuator axis or tower 10 and a
storage disk spindle or axis 12 in a computer file memory.

      Today's hard file memories generally have information stored on
a multiplicity of disk magnetic storage media which are stacked on a
common spindle.  The information stored on the media is accessed by
moving a multiplicity of magnetic transducers 34 which are attached
to a common actuator assembly 32.  The transducers 34 move as a unit
to different radii of the disk storage media depending on which
concentric ring of media the information is to be stored based on the
address of the information.  For maximum efficiency it is desirable
to be able to read the information that was written at a particular
radius on all the media in the stack without having to reposition the
actuator containing the transducers.  This is only possible if the
axis 10 about which the actuator rotates stays aligned to the axis of
rotation of the disk storage media in a rotary actuator machine.
There is a similar relationship required in a linear actuator machine
to be able to access the previously described information without
repositioning the actuator.

      Alignment of the actuator and media axes is controlled by the
disk enclosure base 14 to which they are fastened. The base has been
shown to warp as both a function of ambient temperature and as a
function of thermal gradients caused by the warm up of specific
components as the file comes up to normal operating temperature.

      Described is a solution to this warping which causes
performance problems in files such as the 5 1/4-inch file memories.
Without a solution to this warping which...