APPARATUS FOR CONTROLLING WRITING DATA AND METHOD FOR THE SAME

• US 20110176238A1
• Filed: 01/13/2011
• Published: 07/21/2011
• Est. Priority Date: 01/15/2010
• Status: Active Grant

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: TAGUCHI, Kohei, SHIRATORI, Toshiyuki
• Granted Patent: US 8,599,511 B2
• Time in Patent Office: Days
• US Class Current: 360/72.1
• CPC Class Codes: G11B 15/18 Driving; Starting; Stopping; Arrangements for control or regulation thereof G11B15/56 takes precedence
• CPC Class Codes: G11B 2220/61 wherein solid state memory is used for storing A/V content storing computer data in solid state memories G06F
• CPC Class Codes: G11B 2220/655 Memory in cassette [MIC]
• CPC Class Codes: G11B 2220/90 Tape-like record carriers
• CPC Class Codes: G11B 27/032 on tapes G11B27/036, G11B27/038 take precedence
• CPC Class Codes: G11B 27/107 of operating tapes
• CPC Class Codes: G11B 27/11 by using information not detectable on the record carrier
• CPC Class Codes: G11B 5/00826 comprising a plurality of single poles or gaps or groups thereof operative at the same time

Abstract

In a controller of a tape drive, when a command processor receives a command for moving to the end of data (“EOD”) or the like, an operation signal output unit suspends the moving of a tape and a cartridge memory (“CM”) input/output unit stores therein a state of the tape in which the moving has been omitted. Then, when the command processor receives a command for writing data in this state, the CM input/output unit writes the data to a cartridge memory. Subsequently, for example, when a head passes a proper position at which the data should be actually written to the tape, the CM input/output unit reads the data from the cartridge memory, and the channel input/output unit writes the data to the tape at the proper position.

Claims

1. An apparatus for controlling writing data to a tape medium, comprising:

a movement control unit that, even when a moving operation of the tape medium is instructed to locate a head to a position specified on the tape medium, performs control to suspend the moving operation of the tape medium if the specified position satisfies a predetermined condition; and

a writing unit that, when an instruction to write data to the tape medium is issued while the moving operation is suspended under the control of the movement control unit, writes the data to a storage unit in association with the specified position, the storage unit enabling the writing to be ready to perform within a shorter time than a time required for the moving operation.

2. The apparatus according to claim 1, further comprising a reading unit that reads the data from the storage unit even when an instruction to read the data from the tape medium is issued.

3. The apparatus according to claim 1, further comprising a rewriting unit that rewrites the data written to the storage unit by the writing unit to the tape medium at the specified position stored in the storage unit in association with the data.

4. The apparatus according to claim 3, wherein

the storage unit is non-volatile, and

the rewriting unit rewrites the data written to the storage unit by the writing unit to the tape medium at the specified position, after a tape cartridge including the tape medium unmounted from a tape drive is again mounted on the tape drive.

5. The apparatus according to claim 3, wherein

the rewriting unit rewrites the data written to the storage unit by the writing unit to the tape medium at the specified position, when a free space of the storage unit satisfies a predetermined condition.

6. The apparatus according to claim 3, wherein

the rewriting unit rewrites the data written to the storage unit by the writing unit to the tape medium at the specified position, when the head passes the specified position in a moving operation of the tape medium in a direction of writing the data.

7. A method for controlling writing data to a tape medium, comprising the steps of:

when a moving operation of the tape medium is instructed to locate a head to a first position on the tape medium, omitting the moving operation; and

writing first data to a storage unit in association with the first position when an instruction to write the first data to the tape medium is issued while the moving operation is being omitted, the storage unit enabling the writing to be ready to perform within a shorter time than a time required for the moving operation.

8. The method of claim 7, further comprising the step of:

reading second data written to the tape medium and ended at a second position which is farther from a beginning of the tape medium than the first position is.

9. The method of claim 8, further comprising the step of:

rewriting the first data written to the storage unit to the tape medium at the first position stored in the storage unit in association with the first data, when the tape medium is rewound from the second position.

10. The method of claim 9, wherein the step of rewriting further comprises:

rewriting the data written to the storage unit by the writing unit to the tape medium at the first position, after a tape cartridge including the tape medium unmounted from a tape drive is again mounted on the tape drive.

11. The method of claim 9, wherein the step of rewriting further comprises:

rewriting the data written to the storage unit by the writing unit to the tape medium at the specified position, when a free space of the storage unit satisfies a predetermined condition.

12. The method of claim 9, wherein the step of rewriting further comprises:

rewriting the data written to the storage unit by the writing unit to the tape medium at the specified position, when the head passes the specified position in a moving operation of the tape medium in a direction of writing the data.

13. A computer program product on a physical computer-readable medium for controlling writing data to a tape medium, the product comprising:

computer code for suspending a moving operation of the tape medium that has been instructed to locate a head to a position specified on the tape medium if the specified position satisfies a predetermined condition; and

computer code for writing data to a storage unit in association with the specified position when an instruction to write data to the tape medium is issued while the moving operation is suspended, the storage unit enabling the writing to be ready to perform within a shorter time than a time required for the moving operation.

14. The computer program product of claim 13, further comprising:

computer code for reading second data written to the tape medium and ended at a second position which is farther from a beginning of the tape medium than the first position is.

15. The computer program product of claim 13, further comprising:

computer code for rewriting the first data written to the storage unit to the tape medium at the first position stored in the storage unit in association with the first data, when the tape medium is rewound from the second position.

16. The computer program product of claim 15, wherein the computer code for rewriting further comprises computer code for rewriting the data written to the storage unit by the writing unit to the tape medium at the first position, after a tape cartridge including the tape medium unmounted from a tape drive is again mounted on the tape drive.

17. The computer program product of claim 15, wherein the computer code for rewriting further comprises computer code for rewriting the data written to the storage unit by the writing unit to the tape medium at the specified position, when a free space of the storage unit satisfies a predetermined condition.

18. The computer program product of claim 15, wherein the computer code for rewriting further comprises computer code for rewriting the data written to the storage unit by the writing unit to the tape medium at the specified position, when the head passes the specified position in a moving operation of the tape medium in a direction of writing the data.

19. A tape cartridge for use with a tape drive, comprising:

a tape medium to which data is to be written; and

a storage unit which enables writing to be ready to perform within a shorter time than a time required for a moving operation of the tape medium for locating a head to a position specified on the tape medium, and stores data instructed to be written to the tape medium at the specified position while the moving operation is being omitted.