Quasi-statically tilted magnetic tape head having backward compatibility

• US 8,797,682 B1
• Filed: 08/21/2013
• Issued: 08/05/2014
• Est. Priority Date: 08/21/2013
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Biskeborn, Robert G., Lo, Calvin S.
• Primary Examiner(s): Cao, Allen T
• Application Number:
  US13/972,790
• Time in Patent Office: 349 Days
• Field of Search: 360/121, 360/122, 360/234.3, 360/125.35, 360/125.48, 360/125.01, 360/125.5, 296/031.4, 296/031.6, 296/030.3
• US Class Current: 360/121
• CPC Class Codes: G11B 5/00826 comprising a plurality of single poles or gaps or groups thereof operative at the same time

Abstract

In one general embodiment, an apparatus includes a magnetic head. The magnetic head has a first array of data transducers; a second array of data transducers spaced from the first array; and a third array of data transducers positioned between the first and second arrays. The magnetic head is positionable between a first position and a second position. A pitch of the data transducers of at least two of the arrays presented to the tape is compatible with a first format when the magnetic head is positioned between the first and second positions. The pitch of the data transducers of at least one of the arrays is compatible with a second format when the longitudinal axis of the third array is oriented about perpendicular to the intended direction of tape travel. A data track pitch of the first format is different than the data track pitch of the second format.

Claims

1. An apparatus, comprising:

a magnetic head, the magnetic head having;

a first array of data transducers;

a second array of data transducers spaced from the first array; and

a third array of data transducers positioned between the first and second arrays,

the magnetic head being positionable between a first position and a second position,

wherein a longitudinal axis of the third array is oriented at a first angle relative to a line oriented perpendicular to an intended direction of tape travel across the magnetic head when the magnetic head is in the first position,

wherein the longitudinal axis of the third array is oriented at a second angle relative to the line oriented perpendicular to the intended direction of tape travel when the magnetic head is in the second position,

wherein a pitch of the data transducers of at least two of the arrays presented to the tape is compatible with a first format when the magnetic head is positioned between the first and second positions,

wherein the pitch of the data transducers of at least one of the arrays is compatible with a second format when the longitudinal axis of the third array is oriented about perpendicular to the intended direction of tape travel,

wherein a data track pitch of the first format is different than the data track pitch of the second format.

2. An apparatus as recited in claim 1, wherein the longitudinal axes of the arrays are nominally oriented about parallel to each other, wherein the first and second arrays of data transducers are offset from the third array of data transducers in a direction along the longitudinal axes thereof.

3. An apparatus as recited in claim 1, wherein the data transducers of the first and second arrays are writers, wherein the data transducers of the third array are readers.

4. An apparatus as recited in claim 1, wherein the data transducers of the first and second arrays are readers, wherein the data transducers of the third array are writers.

5. An apparatus as recited in claim 1, further comprising a mechanism for orienting the magnetic head to control the pitch of the data transducers presented to the tape.

6. An apparatus as recited in claim 1, wherein data transducers of the third array are about aligned with data tracks written in the first format when the magnetic head is positioned toward the first position and when the magnetic head is positioned toward the second position.

7. An apparatus as recited in claim 6, wherein outer data transducers of the second array are about aligned with the outer data transducers of the third array when the magnetic head is positioned towards the first position, wherein the outer data transducers of the first array are about aligned with the outer data transducers of the third array when the magnetic head is positioned towards the second position.

8. An apparatus as recited in claim 1, wherein the longitudinal axis of the third array is oriented about perpendicular to the intended direction of tape travel when the magnetic head is in the first position.

9. An apparatus as recited in claim 1, wherein the data transducers of the at least one of the arrays having the pitch that is compatible with the second format when the longitudinal axis of the third array is oriented about perpendicular to the intended direction of tape travel are data readers.

10. An apparatus as recited in claim 1, further comprising:

a drive mechanism for passing a magnetic tape over the magnetic head; and

a controller electrically coupled to the magnetic head.

11. A method, comprising:

receiving a request to write data in a first format;

orienting a magnetic head having first, second and third arrays of data transducers to a position such that a pitch of the data transducers of at least two of the arrays presented to a tape is compatible with the first format;

writing data to the tape in the first format;

receiving a request to read data in a second format, wherein a data track pitch of the first format is different than the data track pitch of the second format;

orienting the magnetic head to a position such that a pitch of the data transducers of one of the arrays presented to the tape is compatible with the second format; and

reading data in the second format from the tape.

12. A method as recited in claim 11, wherein the data transducers of the first and second arrays are writers, wherein the data transducers of the third array are readers.

13. A method as recited in claim 11, wherein the data transducers of the first and second arrays are readers, wherein the data transducers of the third array are writers.

14. A method as recited in claim 11, wherein the third array is positioned between the first and second arrays, wherein the magnetic head is positionable between first and second positions, wherein the data transducers of the third array are about aligned with data tracks written to the tape when the magnetic head is in the first and second positions, wherein a longitudinal axis of the third array is oriented at a negative angle relative to a line oriented perpendicular to an intended direction of tape travel across the magnetic head when the magnetic head is in the first position, wherein the longitudinal axis of the third array is oriented at a positive angle relative to the line oriented perpendicular to the intended direction of tape travel when the magnetic head is in the second position.

15. A method as recited in claim 14, wherein outer data transducers of the second array are about aligned with the outer data transducers of the third array when the magnetic head is positioned towards the first position, wherein the outer data transducers of the first array are about aligned with the outer data transducers of the third array when the magnetic head is positioned towards the second position.

16. A method as recited in claim 11, wherein a longitudinal axis of the third array is oriented about perpendicular to an intended direction of tape travel when the magnetic head is reading data in the second format.