Double-sided disk storage using a single configuration of magnetoresistive head

• US 6,650,506 B1
• Filed: 12/15/1999
• Issued: 11/18/2003
• Est. Priority Date: 12/15/1999
• Status: Expired due to Fees

• Current Assignee: Western Digital Technologies Incorporated (Western Digital Corporation)
• Original Assignee: Western Digital (Fremont) Incorporated (Western Digital Corporation)
• Inventors: Risse, Patrick
• Primary Examiner(s): Renner, Craig A.
• Application Number:
  US09/464,291
• Time in Patent Office: 1,434 Days
• Field of Search: 360/264.2
• US Class Current: 360/264.2
• CPC Class Codes: G11B 2005/0016 of magnetoresistive transducers
• CPC Class Codes: G11B 5/4853 Constructional details of the electrical connection between head and arm
• CPC Class Codes: G11B 5/4886 relative to rotating disc

Abstract

A magnetic data recording system and apparatus providing the flexibility of using a magnetoresistive read/write head in other than its standard orientation. The invention includes a plurality of magnetic recording disks supported on a spindle rotated by a motor. A plurality of arms, each mounted to a common actuator for arcuate motion, support at their distal ends the magnetoresistive read/write heads. The arms suspend the heads in close proximity to upper and lower surfaces of the disks so that the heads may record signals thereto and read signals therefrom. Generally such systems comprise two sets of such heads, a set of up-heads designed for facing upward to read the bottom surface of a disk and another set of down-heads designed to face downward to read an upper surface of a disk. The present invention provides circuitry allowing the up heads to be used in a downward direction and conversely allows a down head to be used in an upward direction, thereby eliminating the need to manufacture and store an equal number of two different configurations of heads.

Claims

1. A magnetic data recording and retrieval system, comprising:

a housing;

at least one magnetic disk having an upper surface and a lower surface and rotationally mounted within said housing;

a plurality of heads, each including at least one read element and at least one write element and each having a plurality of head electrical contacts, said head electrical contacts all being of a single configuration common to all of said plurality of heads;

a plurality of long tail trace suspension assemblies for connection with said plurality of heads, at least one of which is an upward facing head and at least one of which is a downward facing head, each of said plurality of long tail trace suspension assemblies having a distal end and a proximal end, said distal end having distal long tail trace suspension contacts which connect to said head electrical contacts of one of said plurality of heads, and said proximal end having proximal long tail trace suspension contacts, and electrical trace circuitry connecting said distal long tail trace suspension contacts and said proximal long tail trace suspension contacts; and

said long tail trace suspension assemblies including circuitry which is configured to compensate for the orientation of said electrical contacts in said upward facing head as compared with the orientation of electrical contacts of said downward facing head, where said upward facing head and said downward facing head both have a single configuration of contacts.

2. The magnetic data recording and retrieval system of claim 1, wherein:

said plurality of long tail trace suspensions include standard long tail trace suspensions and uni-wafer long tail trace suspensions.

3. A magnetic data recording and retrieval system, comprising:

a housing;

at least one magnetic disk having an upper surface and a lower surface and rotationally mounted within said housing;

a plurality of heads, each including at least one read element and at least one write element and each having a plurality of head electrical contacts, said head electrical contacts all being of a single configuration common to all of said plurality of heads;

a first long tail trace suspension assembly having a distal end and a proximal end, said distal end having distal long tail trace suspension contacts which connect to said head electrical contacts of a first of said plurality of heads, and said proximal end having proximal long tail trace suspension contacts, and electrical trace circuitry connecting said distal long tail trace suspension contacts and said proximal long tail trace suspension contacts, where said first head is a downward facing head proximal to said upper surface of one of said at least one disk;

a second long tail trace suspension assembly having a distal end and a proximal end, said distal end having distal long tail trace suspension contacts which connect to said head electrical contacts of a second of said plurality of heads, and said proximal end having proximal long tail trace suspension contacts, and electrical trace circuitry connecting said distal long tail trace suspension contacts and said proximal long tail trace suspension contacts, where said second head is a upward facing head proximal to said lower surface of one of said at least one disk; and

said long tail trace suspension assemblies including circuitry which is configured to compensate for the orientation of said electrical contacts in said upward facing head as compared with the orientation of electrical contacts of said downward facing head, where said upward facing head and said downward facing head both have a single configuration of contacts.

4. The magnetic data recording and retrieval system of claim 3, wherein:

said long tail trace suspension assemblies include standard long tail trace suspensions and uni-wafer long tail trace suspensions.

5. A magnetic data recording and retrieval system, comprising:

a housing;

at least one magnetic disk having an upper surface and a lower surface and rotationally mounted within said housing;

a plurality of heads, each including at least one read element and at least one write element and each having a plurality of head electrical contacts, said head electrical contacts all being of a single configuration common to all of said plurality of heads;

a first suspension having a distal end and a proximal end, said distal end having distal suspension contacts which connect to said head electrical contacts of a first of said plurality of heads, and said proximal end having proximal suspension contacts, and suspension trace circuitry connecting said distal suspension contacts and said proximal suspension contacts, where said first head is a downward facing head proximal to said upper surface of one of said at least one disk;

a second suspension also having a distal end and a proximal end, said distal end having distal suspension contacts which connect to said head electrical contacts of a second of said plurality of heads, and said proximal end having proximal suspension contacts, and suspension trace circuitry connecting said distal suspension contacts and said proximal suspension contacts, where said second head is an upward facing head proximal to said lower surface of one of said at least one disk; and

a plurality of bridge flex connectors connected to said first and second suspensions, each bridge flex connector having a distal end and a proximal end, said distal end having distal bridge flex connector contacts which connect to said proximal suspension contacts of said first and second suspensions, and said proximal end having proximal bridge flex connector contacts, and electrical trace circuitry connecting said distal bridge flex connector contacts and said proximal bridge flex connector contacts, said bridge flex connectors including circuitry which is configured to compensate for the orientation of said electrical contacts in said upward facing head as compared with the orientation of electrical contacts of said downward facing head, where said upward facing head and said downward facing head both have a single configuration of contacts.

6. The magnetic data recording and retrieval system of claim 5, wherein:

said plurality of bridge flex connectors include standard bridge flex connectors and uni-wafer bridge connectors.