Magnetic tape media having servo patterns

Patent metadata

Field	Value
Publication number	US-9495985-B2
Application number	US-201414543799-A
Country	US
Kind code	B2
Filing date	Nov 17, 2014
Priority date	Jun 18, 2008
Publication date	Nov 15, 2016
Grant date	Nov 15, 2016

Abstract

Magnetic tape media according to one embodiment includes a servo track having a plurality of servo marks therealong. A distance of the servo marks, as originally written, from an edge of the tape media varies along the length of the magnetic tape media. Magnetic tape media according to another embodiment includes a plurality of servo tracks having physical characteristics of being written by an apparatus that monitors a lateral position of the magnetic tape media passing over a servo writing head during a servo track writing operation and writes servo marks to the magnetic tape media. A timing of the writing of each servo mark is based on the monitored position of the magnetic tape media.

First claim

What is claimed is:

1. Magnetic tape media, comprising:
a servo track having a plurality of servo marks therealong,
wherein a distance of the servo marks, as originally written, from an edge of the tape media varies along the length of the magnetic tape media,
wherein the servo marks comprise a series of base sets of magnetically defined bars, wherein distances between otherwise identical groups of base sets is different along a length of the magnetic tape media.

2. The magnetic tape media as recited in claim 1 , wherein each servo mark is individually written.

3. The magnetic tape media as recited in claim 1 , wherein the servo marks comprise a series of magnetically defined bars.

4. The magnetic tape media as recited in claim 3 , wherein the servo marks comprise a series of base sets of magnetically defined bars, each base set comprising two bars oriented at different angles with respect to a length of the magnetic tape media.

5. The magnetic tape media as recited in claim 4 , wherein each of the servo marks in each of the base sets is individually written with respect to all other servo marks on the magnetic tape media.

6. The magnetic tape media as recited in claim 4 , wherein each of the servo marks in each of the base sets is individually written with respect to all other servo marks in the series of base sets of magnetically defined bars.

7. The magnetic tape media as recited in claim 3 , wherein the servo marks comprise a series of base sets of magnetically defined bars, each base set comprising three bars, each base set comprising at least two bars oriented at different angles with respect to a direction of tape travel.

8. The magnetic tape media as recited in claim 3 , wherein the servo marks comprise a series of base sets of magnetically defined bars, each base set comprising at least four bars, each base set comprising at least two bars oriented at different angles with respect to a direction of tape travel.

9. The magnetic tape media as recited in claim 3 , wherein an angle between at least some of the bars is greater than 0 degrees and less than 180 degrees.

10. The magnetic tape media as recited in claim 3 , wherein an angle between at least some of the bars is less than about 50 degrees.

11. The magnetic tape media as recited in claim 1 , wherein at least three servo tracks are present on the magnetic tape media, wherein a distance between the servo tracks is less than about 3 mm.

12. The magnetic tape media as recited in claim 1 , wherein multiple servo tracks are present on the magnetic tape media, wherein a distance between the servo tracks is less than about 1.5 mm.

13. The magnetic tape media as recited in claim 1 , wherein multiple servo tracks are present on the magnetic tape media, wherein the distance between the servo tracks is less than about 0.75 mm.

14. The magnetic tape media as recited in claim 1 , wherein at least three servo tracks are present on the magnetic tape media, wherein at least one the servo tracks has data encoded therein.

15. The magnetic tape media as recited in claim 1 , wherein the servo marks comprise a series of magnetically defined bars.

Assignees

• IBM

Inventors

• Biskeborn Robert G
• Imaino Wayne I

Classifications

• G11B5/584 Primary

  for track following on tapes · CPC title

• G11B15/60

  Guiding record carrier (guiding devices structurally associated with magazines or cassettes G11B23/04) · CPC title

• G11B5/00813

  magnetic tapes · CPC title

• G11B5/5926 Primary

  recorded in separate tracks, e.g. servo tracks · CPC title

• G11B2220/90

  Tape-like record carriers · CPC title