# US 2015/0146321 A1 · Controlling data writing of tape recording apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2015/0146321 A1 - Document ID: US20150146321A1 - Status: Published application - Kind: A1 - Application number: 14/548,229 - Filed: 2014-11-19 - Published: 2015-05-28 - Earliest claimed: 2012-09-21 - Assignees: International Business Machines Corporation - Applicants: International Business Machines Corporation - Inventors: Shinobu Fujihara; Yutaka Oishi - Web page: https://patentgrep.com/patent/US20150146321A1 ## CPC - G11B 15/087: by sensing recorded signals - G11B 5/00817: {on longitudinal tracks only, e.g. for serpentine format recording} - G11B 5/09: Digital recording - G11B 15/026: {by using processor, e.g. microcomputer} - G11B 15/093: by sensing driving condition of record carrier, e.g. travel, tape tension - G11B 20/10: Digital recording or reproducing - G11B 27/00: Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel - G11B 27/107: {of operating tapes} - G11B 2220/93: Longitudinal format, wherein tracks are in the direction of the tape, read with a static head, e.g. DCC - 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 A method according to another embodiment includes writing data on a tape medium in a direction from a first end toward a second end of the tape medium using a tape recording apparatus. The tape recording apparatus includes a magnetic head and is configured to record data on tape media. The method further includes wrap-turning the running direction of the tape medium before reaching the second end and writing a first portion of data remaining to be written when the data remaining to be written is smaller than a volume of the data to be written in one running of the tape medium so that an end of the data is written at a position close to the first end, and writing a second portion of data remaining to be written toward the first end. ## Claims ### Claim 1 A method, comprising: writing data on a tape medium in a direction from a first end toward a second end of the tape medium using a tape recording apparatus, wherein the tape recording apparatus comprises a magnetic head and is configured to record data on tape media; wrap-turning a running direction of the tape medium a first time when the magnetic head reaches the second end of the tape medium; writing the data on the tape medium in a direction toward the first end; wrap-turning the running direction of the tape medium a second time when the magnetic head reaches the first end after the first wrap-turn and performing a subsequent data writing; and wrap-turning the running direction of the tape medium a third time before reaching the second end and writing a first portion of data remaining to be written after the second wrap-turn when the data remaining to be written in the subsequent data writing is smaller than a volume of the data to be written in one running of the tape medium so that an end of the data is written at a position close to the first end, and writing a second portion of data remaining to be written after the second wrap-turn toward the first end. ### Claim 2 (depends on 1) The method according to claim 1, further comprising: receiving a value of a volume of all of the data from a host apparatus; and calculating an amount of data remaining to be written on the tape medium from the value of the volume of all of the data. ### Claim 3 (depends on 2) The method according to claim 2, wherein the calculating the amount of data remaining to be written comprises calculating from the value of the volume of all of the data each time the writing is completed. ### Claim 4 (depends on 2) The method according to claim 2, further comprising: receiving, using the tape recording apparatus, the value of the volume of all of the data by receiving a special command from the host apparatus along with the data. ### Claim 5 (depends on 4) The method according to claim 4, wherein the calculating the amount of data remaining to be written comprises calculating when the value of the volume of all of the data is received. ### Claim 6 (depends on 2) The method according to claim 2, wherein the amount of data remaining to be written is calculated by taking into consideration an allowance margin for a possibility of occurrence of a write error correction. ### Claim 7 (depends on 2) The method according to claim 2, wherein a host apparatus calculates the amount of data remaining to be written from the value of the volume of all of the data, and wherein the tape recording apparatus receives a special command from the host apparatus that indicates a timing to dynamically perform wrap-turns. ### Claim 8 (depends on 1) The method according to claim 1, wherein a position at which data writing starts is a predetermined position that follows servo data adjacent to the first end. ### Claim 9 (depends on 1) The method according to claim 1, wherein the writing the second portion of the data remaining to be written after the wrap-turn comprises writing dummy data up to a position close to the first end when an end of the data being written does not reach the first end. ### Claim 10 (depends on 1) The method according to claim 1, wherein the tape medium has a plurality of bands extending in a longitudinal direction of the tape medium, each of the bands having a plurality of wraps extending in the longitudinal direction, and wherein the writing is performed on pairs of the wraps. ### Claim 11 (depends on 1) The method according to claim 1, wherein the first and second portions of data remaining to be written after the second wrap-turn each have about a same amount of data. ### Claim 12 A method, comprising: writing data on a tape medium in a direction from a first end toward a second end of the tape medium using a tape recording apparatus, wherein the tape recording apparatus comprises a magnetic head and is configured to record data on tape media; and wrap-turning a running direction of the tape medium before reaching the second end and writing a first portion of data remaining to be written when the data remaining to be written is smaller than a volume of the data to be written in one running of the tape medium so that an end of the data is written at a position close to the first end, and writing a second portion of data remaining to be written toward the first end. ### Claim 13 (depends on 12) The method according to claim 12, comprising, prior to wrap-turning the running direction of the tape medium before reaching the second end and writing a first portion of data remaining to be written: writing data on the tape medium in a direction from the first end toward the second end of the tape medium; wrap-turning a running direction of the tape medium when the magnetic head reaches the second end of the tape medium; writing the data on the tape medium in a direction toward the first end; and wrap-turning the running direction of the tape medium when the magnetic head reaches the first end and performing a subsequent data writing. ### Claim 14 (depends on 12) The method according to claim 12, wherein the first and second portions of data remaining to be written after the second wrap-turn each have about a same amount of data. ### Claim 15 (depends on 12) The method according to claim 12, further comprising: receiving a value of a volume of all of the data from a host apparatus; and calculating an amount of data remaining to be written on the tape medium from the value of the volume of all of the data. ### Claim 16 (depends on 15) The method according to claim 15, further comprising: receiving, using the tape recording apparatus, the value of the volume of all of the data by receiving a special command from the host apparatus along with the data. ### Claim 17 (depends on 15) The method according to claim 15, wherein the amount of data remaining to be written is calculated by taking into consideration an allowance margin for a possibility of occurrence of a write error correction. ### Claim 18 (depends on 12) The method according to claim 12, wherein a position at which data writing starts is a predetermined position that follows servo data adjacent to the first end. ### Claim 19 (depends on 12) The method according to claim 12, wherein the writing the second portion of the data remaining to be written after the wrap-turn comprises writing dummy data up to a position close to the first end when an end of the data being written does not reach the first end. ### Claim 20 (depends on 12) The method according to claim 12, wherein the tape medium has a plurality of bands extending in a longitudinal direction of the tape medium, each of the bands having a plurality of wraps extending in the longitudinal direction, and wherein the writing is performed on pairs of the wraps.