# US 2008/0186610 A1 · Apparatus, system, and method for an "m" servo pattern > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2008/0186610 A1 - Document ID: US20080186610A1 - Status: Published application - Kind: A1 - Application number: 11/670,913 - Filed: 2007-02-02 - Published: 2008-08-07 - Earliest claimed: 2007-02-02 - Inventors: Nhan Xuan Bui; Robert Allen Hutchins; Mark Allan Taylor - Web page: https://patentgrep.com/patent/US20080186610A1 ## CPC - G11B 5/584: for track following on tapes - G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R) ## Abstract An apparatus, system, and method are disclosed for an “M” servo pattern. A servo pattern write module is included to simultaneously create a first servo mark, a second servo mark, a third servo mark, and a fourth servo mark in an “M” servo pattern on a magnetic tape. The magnetic tape is configured to store data. The first, second, third, and fourth servo marks are substantially linear and are substantially the same length. The first and third servo marks are positioned with a forward slope comprising first and third legs of the “M” pattern. The second and fourth servo marks are positioned with a backward slope comprising second and fourth legs of the “M” pattern. Distances between center points of the first and second servo marks, second and third servo marks, and third and fourth servo marks are substantially the same. ## Claims ### Claim 1 An apparatus to create an “m” servo pattern on a magnetic tape, the apparatus: comprising: a servo pattern write module configured to simultaneously create a first servo mark, a second servo mark, a third servo mark, and a fourth servo mark in an “M” servo pattern on a magnetic tape, the magnetic tape configured to store data, wherein the first, second, third, and fourth servo marks are substantially linear and are substantially the same length; the first and third servo marks are positioned with a forward slope comprising first and third legs of the “M” pattern; the second and fourth servo marks are positioned with a backward slope comprising second and fourth legs of the “M” pattern; and distances between center points of the first and second servo marks, second and third servo marks, and third and fourth servo marks are substantially the same. ### Claim 2 (depends on 1) The apparatus of claim 1, wherein the servo pattern write module comprises a first servo write head configured to write the first and second servo marks and a second servo write head configured to write the third and fourth servo marks. ### Claim 3 (depends on 1) The apparatus of claim 1, wherein the servo pattern write module comprises a servo write head configured to write the first, second, third, and fourth servo marks. ### Claim 4 (depends on 1) The apparatus of claim 1, wherein the servo pattern write module creates more than four servo marks simultaneously. ### Claim 5 (depends on 1) The apparatus of claim 1, wherein an absolute value of the slope of the first and third servo marks is substantially the same and the absolute value of the slope of the second and fourth servo marks is substantially the same. ### Claim 6 (depends on 1) The apparatus of claim 1, wherein the servo pattern write module further comprises a burst module configured to create multiple first, second, third, and fourth servo marks in a regular pattern wherein a group of first servo marks is positioned before a group of second servo marks, the group of second servo marks is positioned before a group of third servo marks, and the group of third servo marks is positioned before a group of fourth servo marks. ### Claim 7 (depends on 6) The apparatus of claim 6, wherein the burst module creates an equal number of first and second servo marks and an equal number of third and fourth servo marks and the number of first and second servo marks differs from the number of third and fourth servo marks. ### Claim 8 (depends on 6) The apparatus of claim 6, wherein the burst module creates longitudinal position (“LPOS”) data within at least one set of servo marks. ### Claim 9 (depends on 6) The apparatus of claim 6, wherein the burst module creates the LPOS data by shifting at least one servo mark relative to another servo mark. ### Claim 10 (depends on 6) The apparatus of claim 6, wherein the burst module creates five first servo marks, five second servo marks, four third servo marks, and four fourth servo marks. ### Claim 11 An apparatus to read an “M” servo pattern on a magnetic tape, the apparatus comprising: a servo read module configured to read an “M” pattern servo mark on a servo track of a magnetic tape configured to store data, the “M” pattern servo mark created by a servo pattern write module configured to simultaneously create a first servo mark, a second servo mark, a third servo mark, and a fourth servo mark, wherein the first, second, third, and fourth servo marks are substantially linear and are substantially the same length; the first and third servo marks are positioned with a forward slope comprising first and third legs of the “M” pattern; the second and fourth servo marks are positioned with a backward slope comprising second and fourth legs of the “M” pattern; and distances between center points of the first and second servo marks, second and third servo marks, and third and fourth servo marks are substantially the same; and a servo position module configured to reposition a data head assembly in response to position information received by the servo read module, the data head assembly comprising one of at least one read head configured to read data from the magnetic tape and at least one write head configured to write data to the magnetic tape. ### Claim 12 (depends on 11) The apparatus of claim 11, wherein the servo read module is further configured to read an “M” pattern servo mark comprising a burst of first servo marks, a burst of second servo marks, a burst of third servo marks, and a burst of fourth servo marks. ### Claim 13 A system to create an “M” servo pattern on a magnetic tape, the system comprising: a tape formatting device comprising a tape drive module configured to move a magnetic tape from a first reel to a second reel and a servo pattern write module configured to simultaneously create a first servo mark, a second servo mark, a third servo mark, and a fourth servo mark in an “M” servo pattern on the magnetic tape, the magnetic tape configured to store data, wherein the first, second, third, and fourth servo marks are substantially linear and are substantially the same length; the first and third servo marks are positioned with a forward slope comprising first and third legs of the “M” pattern; the second and fourth servo marks are positioned with a backward slope comprising second and fourth legs of the “M” pattern; and distances between center points of the first and second servo marks, second and third servo marks, and third and fourth servo marks are substantially the same. ### Claim 14 (depends on 13) The system of claim 13, wherein the servo pattern write module comprises a first servo write head configured to write the first and second servo marks and a second servo write head configured to write the third and fourth servo marks. ### Claim 15 (depends on 13) The system of claim 13, wherein the servo pattern write module comprises a servo write head configured to write the first, second, third, and fourth servo marks. ### Claim 16 (depends on 13) The system of claim 13, wherein the tape formatting device comprises a servo pattern write module for each servo track on a magnetic tape. ### Claim 17 (depends on 13) The system of claim 13, further comprising a tape reader/writer configured with at least one servo read head configured to read the “M” pattern servo marks of the magnetic tape formatted by the tape formatting device with “M” pattern servo marks, wherein the at least one servo read head of the tape reader/writer reads an “M” pattern formed by first, second, third, and fourth servo marks without reading an “M” pattern formed by a third and a fourth servo mark of a first “M” pattern and a first and a second servo mark formed by a second “M” pattern. ### Claim 18 A computer program product comprising a computer readable medium having computer usable program code programmed for creating an “M” servo pattern on a magnetic tape, the operations of the computer program product comprising: simultaneously creating at least one servo track comprising a plurality of “M” pattern servo marks on a magnetic tape configured to store data, the “M” pattern servo mark comprising a first servo mark, a second servo mark, a third servo mark, and a fourth servo mark in an “M” servo pattern, wherein the first, second, third, and fourth servo marks are substantially linear and are substantially the same length; the first and third servo marks are positioned with a forward slope comprising first and third legs of the “M” pattern; the second and fourth servo marks are positioned with a backward slope comprising second and fourth legs of the “M” pattern; and distances between center points of the first and second servo marks, second and third servo marks, and third and fourth servo marks are substantially the same. ### Claim 19 (depends on 18) The computer program product of claim 18, further comprising: reading an “M” pattern servo mark on each servo track using a servo head for each servo track configured to read an “M” pattern servo mark; and repositioning at least one read head in response to position data received by a servo read head. ### Claim 20 (depends on 18) The computer program product of claim 18, further comprising: reading an “M” pattern servo mark on each servo track using a servo head for each servo track configured to read an “M” pattern servo mark; and repositioning at least one write head in response to position data received by a servo read head.