Tape recording head having non-parallel gaps and dissimilar transducer pitches

Patent metadata

Field	Value
Publication number	US-9355664-B2
Application number	US-201514735392-A
Country	US
Kind code	B2
Filing date	Jun 10, 2015
Priority date	Mar 11, 2014
Publication date	May 31, 2016
Grant date	May 31, 2016

Abstract

An apparatus according to one embodiment includes first and second arrays of transducers, each array having a longitudinal axis defined between outermost transducers thereof. The longitudinal axes of the arrays are not parallel to one another. At least one servo track reader is associated with each array for reading servo data from the medium. The transducers are for reading and/or writing data in data bands of the magnetic medium. A computer program product for writing data to a magnetic recording tape, according to one embodiment, includes a computer readable storage medium having program instructions embodied therewith. The program instructions are executable by a controller to cause the controller to determine an extent of tape dimensional instability, cause adjustment of a tilt angle of a first array of transducers to perform a readback operation based on the determined extent, and cause performance of the readback operation.

First claim

What is claimed is:

1. An apparatus, comprising:
a first array of transducers having a longitudinal axis defined between outermost transducers thereof;
a second array of transducers having a longitudinal axis defined between outermost transducers thereof; and
at least one servo track reader associated with each array for reading servo data from servo bands of a magnetic medium,
wherein the longitudinal axes of the arrays are not parallel to one another,
wherein the transducers are for reading and/or writing data in data bands of the magnetic medium.

2. The apparatus as recited in claim 1 , wherein orientations of the longitudinal axes of the arrays are permanently fixed relative to each other.

3. The apparatus as recited in claim 1 , wherein an angle between the longitudinal axes of the arrays is adjustable.

4. The apparatus as recited in claim 1 , wherein a pitch of the transducers of the first array is greater than a pitch of the transducers of the second array, wherein the transducers are for reading and/or writing non-servo data in data bands.

5. The apparatus as recited in claim 1 , wherein a relative angle between the longitudinal axes is greater than 0.1 degree, wherein the data bands are defined between closest pairs of the servo bands.

6. The apparatus as recited in claim 1 , wherein an average width of the transducers of the first array is smaller than an average width of the transducers of the second array.

7. The apparatus as recited in claim 1 , wherein the transducers of the first array are dissimilar to the transducers in the second array, wherein longitudinal axes of the arrays are never parallel to one another.

8. The apparatus as recited in claim 1 , comprising a third array of transducers having a longitudinal axis oriented parallel to the longitudinal axis of the second array.

9. The apparatus as recited in claim 1 , wherein the transducers of the first array include readers.

10. The apparatus as recited in claim 1 , comprising a third array of transducers having a longitudinal axis defined between outermost transducers thereof, wherein the longitudinal axes of the first, second and third arrays are not parallel to one another.

11. An apparatus as recited in claim 1 , comprising:
a drive mechanism for passing a magnetic medium over the arrays of transducers; and
a controller electrically coupled to the arrays of transducers, the controller configured to use the at least one servo track reader to read servo data from the servo bands of the magnetic medium while the transducers are reading and/or writing data in data bands.

12. An apparatus, comprising:
a first array of transducers having a longitudinal axis defined between outermost transducers thereof;
a second array of transducers having a longitudinal axis defined between outermost transducers thereof, wherein the longitudinal axes of the first and second arrays are not parallel to one another;
a drive mechanism for passing a magnetic medium over the arrays of transducers; and
a controller electrically coupled to the arrays of transducers,
wherein the controller is configured to:
determine an extent of tape dimensional instability;
cause adjustment of a tilt angle of a first array of transducers to perform a readback operation based on the determined extent; and
cause performance of the readback operation.

13. The apparatus as recited in claim 12 , wherein orientations of the longitudinal axes of the arrays are permanently fixed relative to each other.

14. The apparatus as recited in claim 12 , wherein a pitch of the transducers of the first array is greater than a pitch of the transducers of the second array.

15. The apparatus as recited in claim 12 , wherein an average width of the transducers of the first array is smaller than an average width of the transducers of the second array.

16. The apparatus as recited in claim 12 , wherein an angle between the longitudinal axes of the arrays is adjustable.

17. The apparatus as recited in claim 12 , wherein the transducers of the first array are dissimilar to the transducers in the second array.

18. The apparatus as recited in claim 12 , comprising a third array of transducers having a longitudinal axis, wherein the longitudinal axes of the first, second and third arrays are not parallel to one another.

19. A computer program product for writing data to a magnetic recording tape, the computer program product comprising a non-transitory computer readable storage medium having program instructions embodied therewith, the program instructions executable by a controller to cause the controller to:
determine, by the controller, an extent of tape dimensional instability;
select, by the controller, a first of at least two arrays to use for a readback operation based at least in part on a pitch between transducers thereof and on the determined extent, wherein the pitch of the transducers of the first array is great than the pitch of the transducers of a second of the arrays;
cause, by the controller, adjustment of a tilt angle of a first array of transducers to perform a readback operation based on the determined extent; and
cause, by the controller, performance of the readback operation.

20. The computer program product as recited in claim 19 , comprising program instructions executable by the controller to cause the controller to adjust an angle between longitudinal axes of the first array relative to a second array of transducers.

Assignees

• IBM

Inventors

• Biskeborn Robert G
• Lo Calvin S

Classifications

• G11B5/584 Primary

  for track following on tapes · CPC title

• G11B5/56 Primary

  with provision for moving the head {support} for the purpose of adjusting the position of the head relative to the record carrier, e.g. manual adjustment for azimuth correction or track centering ({G11B5/52,} G11B5/54, G11B5/58 take precedence) · CPC title

• G11B5/00826

  comprising a plurality of single poles or gaps or groups thereof operative at the same time · CPC title

• G11B5/58

  with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following {(spacing means incorporated in the head structure G11B5/187, G11B5/255, G11B5/3106)} · CPC title

• G11B5/4893

  relative to moving tape · CPC title