Magnetic tape media having servo patterns

• US 9,495,985 B2
• Filed: 11/17/2014
• Issued: 11/15/2016
• Est. Priority Date: 06/18/2008
• Status: Active Grant

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Biskeborn, Robert G., Imaino, Wayne I.
• Primary Examiner(s): Sniezek, Andrew L
• Application Number:
  US14/543,799
• Publication Number:
  US 20150070797A1
• Time in Patent Office: 729 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: G11B 15/60 Guiding record carrier guiding devices structurally associated with magazines or cassettes G11B23/04
• CPC Class Codes: G11B 2220/90 Tape-like record carriers
• CPC Class Codes: G11B 5/00813 magnetic tapes
• CPC Class Codes: G11B 5/584 for track following on tapes
• CPC Class Codes: G11B 5/5926 recorded in separate tracks, e.g. servo tracks

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.

Claims

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.