JP2005071455A - Magnetic tape device, magnetic tape device control method, and magnetic tape device control program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnetic tape device in which movement of a tape is suppressed by controlling running speed of the tape so that a guide roller can follow running of the tape, write-in/ read-out of data are performed normally for a magnetic tape. <P>SOLUTION: This magnetic tape device is provided with a speed comparing part 3041 comparing rotation speed of a guide roller obtained from a signal from a guide roller sensor 310 with running speed of a magnetic tape obtained from a motor control part 307, and a tape running speed setting part 3042 decelerating running speed of the magnetic tape when running speed of the magnetic tape is faster. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a magnetic tape device, a magnetic tape device control method, and a magnetic tape device control program, and in particular, a magnetic tape device that controls the running speed of a magnetic tape by comparing the rotational speed of a guide roller and the running speed of the magnetic tape, The present invention relates to a magnetic tape device control method and a magnetic tape device control program.

  A traveling system in a conventional magnetic tape device 700 (described in FIG. 11) will be described with reference to FIG. Here, a serpentine magnetic tape device (hereinafter referred to as a magnetic tape device 700) having a function of simultaneously reading and writing a plurality of tracks (hereinafter referred to as multitrack) and an error correction function of demodulating a defective track will be described. To do. Referring to FIG. 10, in a running system 600 in the magnetic tape device 700, guide rollers 603 a to 603 d and a movable magnetic head 606 are provided on a base 607. In the magnetic tape device 700, the track position of the magnetic tape to be written and read is defined by the distance from the reference end of the magnetic tape. In order to perform writing / reading accurately on the designated track, it is necessary to reliably bring the movable magnetic head 606 into contact with the magnetic tape. When the magnetic tape is run with the magnetic tape and the movable magnetic head 606 in contact with each other, blurring occurs in the direction perpendicular to the longitudinal direction in the tape surface of the magnetic tape. Therefore, there arises a problem that the movable magnetic head 606 cannot be brought into contact with the track to be brought into contact. In order to reduce blurring in the magnetic tape, a tape guide (guide rollers 603a to 603d) is provided on the base 607 in the tape running system.

  The guide rollers 603a to 603d rotate while following the traveling speed of the traveling magnetic tape, thereby correcting the blur of the magnetic tape in the direction perpendicular to the longitudinal direction (short direction) within the tape surface. The movable magnetic head 606 reads / writes data recorded on the magnetic tape. Blur of the magnetic tape that could not be corrected by the guide rollers 603a to 603d is also corrected by the movable magnetic head 606.

  Next, the internal configuration of the conventional magnetic tape device 700 will be described with reference to FIG. The magnetic tape device 700 includes an interface unit 702, an IO control unit 703, an MPU (micro processing unit) 704, a data control unit 705, a magnetic head 706 (which is a magnetic head unit of the movable magnetic head 606), a motor. A control unit 707 and a motor 708 are provided. The host device 701 sends a read / write command to the magnetic tape 709 to the MPU 704 via the interface unit 702 and the IO control unit 703.

  The MPU 704 sends a read / write processing command to the data control unit 705 via the IO control unit 703. The MPU 704 sends a traveling direction command to the motor control unit 707 and drives the motor 708 in the traveling direction commanded by the host device. When the reading is completed normally, a normal completion report is sent to the host device 701.

  When a data error signal and a position error signal are sent from the data control unit 705, the MPU 704 issues an instruction to perform a specified number of retry processes to the data control unit 705. If the process still cannot be completed normally, the abnormal end is reported to the host device 701 via the IO control unit 703 and the interface unit 702.

  The data control unit 705 has a role of sending a signal and data in accordance with a command received from the MPU 704. At the time of writing, the data sent from the host device 701 via the IO control unit 703 is converted into a data system for recording on the medium, and the data is sent to the magnetic head 706. At the time of reading, the data sent from the magnetic head 706 is converted into data that can be recognized by the host device 701 and sent to the IO control unit 703. If the data writing / reading process is not completed normally, an instruction is issued to correct the shake of the magnetic tape 709 with the movable magnetic head 606. If the correction cannot be performed, the position error signal and the read / write error signal that are active in that case are sent to the MPU 704 via the IO control unit 703.

  The magnetic head 706 writes the data sent from the data control unit 705 to the magnetic tape 709 at the time of writing. At the time of reading, the data read from the magnetic tape 709 is sent to the data control unit 705.

  FIG. 12 shows a flowchart of data write / read operations in the conventional magnetic tape apparatus 700. Data writing / reading is performed (s801), and when there is no read / write error when the recorded data is detected and the data can be read normally (s802, No), the process ends normally (s803). If a read / write error is detected (Yes in s802), the movable magnetic head 606 tries to correct the blur of the tape (S804). If the error cannot be corrected, a position error signal is transmitted to the MPU 704 (S805). ). Then, a retry operation (s806) is performed in which the write / read process is performed a specified number of times again. If reading / writing does not end normally even after the prescribed number of times, it ends abnormally (s807).

  Here, in the magnetic tape device 700 described above, the running speed of the magnetic tape is not controlled in accordance with the rotational speed of the guide roller.

  In addition, in a magnetic tape apparatus having a conventional guide roller, a technique for monitoring the rotational speed of the guide roller and controlling the traveling speed of the magnetic tape to be constant is disclosed. (For example, refer to Patent Documents 1, 2, and 3.) In this technique, since the traveling speed of the magnetic tape is obtained from the rotational speed of the guide roller, the actual traveling speed of the magnetic tape is not known. Therefore, the running speed of the magnetic tape is not controlled in accordance with the rotation of the guide roller.

Japanese Patent Laid-Open No. 03-147553

Japanese Patent Laid-Open No. 04-079056 Japanese Patent No. 2592007

  A problem with conventional magnetic tape devices is that data writing / reading on the magnetic tape may not be performed normally. One of the factors is that the tape is blurred. One of the causes of the blur is that the guide roller cannot follow the running of the tape. The guide roller is originally intended to prevent the blur of the tape, but on the contrary, the following failure of the guide roller is a cause. Then, if the tape blur occurs in the direction perpendicular to the longitudinal direction (short direction) in the tape surface, and the blur is large, it cannot be handled by correction, and data writing / reading on the magnetic tape is normal. Could not be done.

  An object of the present invention is to control tape running speed by controlling the tape running speed so that the guide roller can follow the tape running, and data writing / reading to / from the magnetic tape is performed normally. It is to provide a magnetic tape device.

  2. The magnetic tape device according to claim 1, further comprising a guide roller rotatably supported on a base while being in contact with the magnetic tape in order to bring the magnetic tape into contact with the magnetic head. A speed comparison unit that compares the rotational speed of the magnetic tape with the traveling speed of the magnetic tape, and a tape traveling speed setting unit that decelerates the traveling speed of the magnetic tape when the traveling speed of the magnetic tape is faster. Features.

  The magnetic tape device according to claim 2 detects and controls a guide roller rotatably supported on the base while being in contact with the magnetic tape so that the magnetic tape contacts the magnetic head, and a traveling speed of the magnetic tape. A motor control unit, a guide roller sensor for detecting the rotation speed of the guide roller, and an MPU for controlling the magnetic tape device, wherein the MPU and the traveling speed of the magnetic tape informed from the motor control unit A speed comparison unit that compares the rotation speed of the guide roller informed from a guide roller sensor, and a tape that sets a lower running speed of the magnetic tape in the motor control unit when the running speed of the magnetic tape is faster A running speed setting unit, and the motor control unit runs the tape at the running speed of the magnetic tape set by the tape running speed setting unit. And characterized in that.

  The magnetic tape device according to claim 3, wherein the motor control unit causes the tape to run at the running speed of the magnetic tape set by the tape running speed setting unit, and then the speed comparison unit runs the magnetic tape. Further comparing the speed and the rotation speed of the guide roller, when the traveling speed of the magnetic tape is faster, the tape traveling speed setting unit sets the traveling speed of the magnetic tape further slower in the motor control unit, The motor control unit causes the tape to run at the running speed of the magnetic tape set by the tape running speed setting unit.

  The magnetic tape device according to claim 4, wherein the magnetic tape device includes a guide roller rotatably supported on a base while being in contact with the magnetic tape to bring the magnetic tape into contact with the magnetic head. A data transfer speed setting section for setting a transfer speed faster than a preset speed; a tape travel speed setting section for changing the travel speed of the magnetic tape to a travel speed that matches the set data transfer speed; A speed comparison unit that compares the rotational speed of the guide roller and the traveling speed of the magnetic tape, and when the traveling speed of the magnetic tape is faster, the data transfer speed setting section is configured to transfer the data. The tape running speed setting unit changes the running speed of the magnetic tape to a running speed that matches the data transfer speed set to be slower. It is characterized in.

  The magnetic tape device according to claim 5 detects and controls the guide roller rotatably supported on the base while being in contact with the magnetic tape in order to bring the magnetic tape into contact with the magnetic head, and the traveling speed of the magnetic tape. A motor control unit; a guide roller sensor for detecting a rotation speed of the guide roller; and an MPU for controlling the magnetic tape device, wherein the MPU sets the data transfer speed faster than a preset speed. A data transfer speed setting section; a tape travel speed setting section that sets the travel speed of the magnetic tape to a travel speed that matches the set data transfer speed; and the travel of the magnetic tape that is informed from the motor control section. A speed comparison unit that compares the speed and the rotation speed of the guide roller informed by the guide roller sensor, and the motor control unit When the tape travels at the travel speed set by the travel speed setting unit and the travel speed of the magnetic tape is higher than the result of the comparison in the speed comparison unit, the data transfer speed setting unit performs the data transfer speed. The tape running speed setting unit changes the setting to the running speed of the magnetic tape in accordance with the data transfer speed that has been slowed down, and the motor control unit is set by the tape running speed setting unit. The tape is run at the running speed of the magnetic tape.

  The magnetic tape device according to claim 6, wherein the motor control unit travels the tape at the travel speed of the magnetic tape set by the tape travel speed setting unit, and then the speed comparison unit performs the travel speed of the magnetic tape. The rotation speed of the guide roller is further compared, and when the running speed of the magnetic tape is faster, the data transfer speed setting unit sets the data transfer speed slower, and the tape running speed setting unit The setting is changed to the traveling speed of the magnetic tape in accordance with the data transfer speed that has become slow, and the motor control section travels the tape at the traveling speed of the magnetic tape set by the tape traveling speed setting section. It is characterized by.

  8. The magnetic tape device according to claim 7, further comprising a guide roller rotatably supported on a base while being in contact with the magnetic tape in order to bring the magnetic tape into contact with the magnetic head. When an error occurs in reading or writing data to or when the data transfer speed is set faster than the speed set in advance by the data transfer speed setting unit, the rotation speed of the guide roller and the magnetic tape A speed comparison unit that compares the traveling speed of the magnetic tape, and when an error occurs in reading or writing data to the magnetic tape and the traveling speed of the magnetic tape is higher, the traveling speed of the magnetic tape is decreased. Set the data transfer rate in advance when the data is normally read or written to the magnetic tape. The speed comparison unit compares the rotation speed of the guide roller and the traveling speed of the magnetic tape after setting the data transfer speed faster than a preset speed and setting the data transfer speed faster than a preset speed. As a result, when the traveling speed of the magnetic tape is faster, the data transfer speed setting unit that sets the data transfer speed slower, and the traveling speed of the magnetic tape is adjusted to the set data transfer speed. And a tape travel speed setting unit that changes the travel speed.

  9. A magnetic tape device control method according to claim 8, comprising: a guide roller rotatably supported on a base while being in contact with the magnetic tape in order to bring the magnetic tape into contact with the magnetic head. The rotation speed of the guide roller is compared with the traveling speed of the magnetic tape, and when the traveling speed of the magnetic tape is higher, the traveling speed of the magnetic tape speed is reduced.

  In the magnetic tape device control method according to claim 9, after the traveling speed of the magnetic tape speed is reduced, the traveling speed of the magnetic tape is further compared with the rotational speed of the guide roller, and the traveling speed of the magnetic tape is When the speed is faster, the motor control unit is further configured to set the running speed of the magnetic tape to be slower and to run the tape at the running speed of the magnetic tape set by the tape running speed setting unit.

  The magnetic tape device control method according to claim 10 includes a guide roller rotatably supported on the base while being in contact with the magnetic tape in order to bring the magnetic tape into contact with the magnetic head. In the magnetic tape device control method for transferring the read data, the data transfer speed is set faster than a preset speed, and the running speed of the magnetic tape is set to the set data transfer speed. The rotation speed of the guide roller and the traveling speed of the magnetic tape are compared, and when the traveling speed of the magnetic tape is faster, the data transfer speed is set slower, and the traveling speed of the magnetic tape is changed. The speed is changed to a traveling speed in accordance with the data transfer speed set to be slow.

  The magnetic tape device control method according to claim 11, wherein after changing the traveling speed of the magnetic tape to a traveling speed that matches the data transfer speed set to be slower, the traveling speed of the magnetic tape and the guide roller When the traveling speed of the magnetic tape is faster, the data transfer speed is set to be slower, and the traveling speed of the magnetic tape is adjusted to the slower data transfer speed. The setting is changed, and the tape is run at the running speed of the magnetic tape set by the tape running speed setting unit.

  13. The magnetic tape device control method according to claim 12, wherein the magnetic tape device control method includes a guide roller rotatably supported on the base while being in contact with the magnetic tape in order to bring the magnetic tape into contact with the magnetic head. When an error occurs in reading or writing data to the magnetic tape, the rotational speed of the guide roller is compared with the traveling speed of the magnetic tape, and when the traveling speed of the magnetic tape is higher, the magnetic tape When the data is read or written normally to the magnetic tape, the data transfer speed is set faster than a preset speed, and the magnetic tape running speed is reduced. Is changed to a traveling speed that matches the set data transfer speed, and the rotational speed of the guide roller and the traveling speed of the magnetic tape are changed. When the traveling speed of the magnetic tape is faster, the data transfer speed is set slower, and the traveling speed of the magnetic tape is set to the slower data transfer speed. It is characterized by changing to speed.

  14. A magnetic tape device control program according to claim 13, wherein said magnetic tape device control program includes a guide roller rotatably supported on a base while being in contact with the magnetic tape in order to bring the magnetic tape into contact with the magnetic head. The comparison means for comparing the rotation speed of the guide roller and the traveling speed of the magnetic tape, and the tape traveling speed setting means for decelerating the traveling speed of the magnetic tape when the traveling speed of the magnetic tape is higher It is characterized by making it.

  15. The magnetic tape device control program according to claim 14, wherein after the tape running speed setting means decelerates the running speed of the tape, the speed comparing means again sets the running speed of the magnetic tape and the rotational speed of the guide roller. It functions as a means for comparing, and when the traveling speed of the magnetic tape is higher, the tape traveling speed setting means functions as a means for decelerating the traveling speed of the magnetic tape speed again.

  The magnetic tape device control program according to claim 15 is provided with a magnetic tape having a guide roller rotatably supported on a base while being in contact with the magnetic tape in order to bring the magnetic tape into contact with the magnetic head. The control means of the magnetic tape device provided with the guide roller for contacting, the data transfer speed setting means for setting the data transfer speed faster than a preset speed, and the running speed of the magnetic tape is set Tape traveling speed setting means for changing to a traveling speed according to the data transfer speed, speed comparing means for comparing the rotational speed of the guide roller and the traveling speed of the magnetic tape, and the traveling speed of the magnetic tape being higher Further, the data transfer speed setting means sets the data transfer speed slower, and the tape running speed setting means The tape running speed of, characterized in that to function as means for changing the travel speed to match the transfer speed of the slow set the data.

  17. The magnetic tape device control program according to claim 16, wherein the tape running speed setting means functions as means for changing the running speed of the magnetic tape to a running speed that matches the data transfer speed set to be slower. Later, the speed comparing means functions again as means for comparing the traveling speed of the magnetic tape and the rotational speed of the guide roller. When the traveling speed of the magnetic tape is faster, the data transfer speed setting means is again turned on. As means for setting the data transfer speed slower, the motor control means as means for changing the setting of the tape travel speed setting means again to the travel speed of the magnetic tape in accordance with the data transfer speed that has been slowed down. Again function as means for running the tape at the running speed of the magnetic tape set by the tape running speed setting unit. It is characterized in.

18. A magnetic tape device control program according to claim 17, wherein said magnetic tape device control program includes a guide roller rotatably supported on a base while being in contact with the magnetic tape in order to bring the magnetic tape into contact with the magnetic head. The rotation of the guide roller when an error occurs in reading or writing data to the magnetic tape, or when the data transfer speed is set faster than a preset speed by the data transfer speed setting means As a speed comparison means for comparing the speed and the traveling speed of the magnetic tape, when an error occurs in reading or writing data to the magnetic tape and the traveling speed of the magnetic tape is higher, the magnetic tape When the running speed is set to slow and data is read or written normally to the magnetic tape The data transfer speed is set faster than a preset speed, and the data transfer speed is set faster than a preset speed, and then the rotation speed of the guide roller and the running speed of the magnetic tape are set. When the traveling speed of the magnetic tape is higher as a result of comparison by the speed comparing means, the data transfer speed setting means for setting the data transfer speed slower and the data for which the traveling speed of the magnetic tape is set. It functions as a tape running speed setting means for changing the running speed to match the transfer speed.

  The effects of the present invention are that tape blurring can be suppressed and data writing / reading performance can be improved.

The reason is as follows. If the guide roller does not follow the tape running speed for some reason, the guide roller follows the tape running by comparing the rotation speed of the guide roller with the running speed of the magnetic tape instead of performing the specified number of retries. Control the running speed of the tape as possible. That is, when the traveling speed of the magnetic tape is faster, the traveling speed of the magnetic tape is reduced.

  The best mode for carrying out the present invention will be described.

  First, a first embodiment of the present invention will be described in detail with reference to FIGS. 1, 2, 3, 4, and 5. FIG.

(Constitution)
FIG. 1 shows a running system 100 of a magnetic tape device 300 (see FIG. 3) in Embodiment 1 of the present invention. Here, a general serpentine type multi-track magnetic tape device (hereinafter referred to as a magnetic tape device 300) for simultaneously writing to and reading from a plurality of tracks on a medium is shown.

  A traveling system 600 in the magnetic tape device 300 includes a supply reel motor 101, a take-up reel motor 102, guide rollers 103a to 103d, reflection sensors 105a and 105b, and a movable type. And a magnetic head 106. The point provided with the reflection type sensors 105a and 105b is different from the prior art. A guide roller 103a, 103b, 103c, 103d and a movable magnetic head 106 are provided between the supply reel motor 101 and the take-up reel motor 102, and simultaneously on a plurality of tracks on a magnetic recording medium (hereinafter referred to as magnetic tape 309, see FIG. 3). Write and read. The magnetic tape device 300 performs forward traveling 111 and reverse traveling 112 by a supply reel motor 101 and a take-up reel motor 102 to write / read recording data from the magnetic tape 309.

  FIG. 2 is a side view of the traveling system 100 of the magnetic tape device 300 shown in FIG. The guide roller 103b and the guide roller 103c are provided with markings 108a and 108b for sensor detection, and reflective sensors 105a and 105b capable of detecting the marking portions are provided on the base 107. When the guide rollers 103b and 103c rotate, the reflection sensor 105 detects the markings 108a and 108b every rotation, thereby detecting the rotation period of the guide rollers 103b and 103c. Based on the rotation cycle of the guide rollers 103b and 103c, in the MPU 304 speed comparison unit 3041, which will be described later, the tape running motor 308 (see FIGS. 1 and 3; FIG. 1 shows the supply reel motor 101 and the take-up reel motor 102). It is detected whether the rotation speed of the guide roller follows the travel speed of the equivalent). Here, both of the guide roller 103a and the guide roller 103b are monitored because there is a possibility that data writing / reading may not be completed normally if both of the rollers cannot follow the tape running speed. The movable magnetic head 106 operates when the data cannot be read by the magnetic head, and corrects the blur.

  FIG. 3 shows an internal configuration of the magnetic tape device 300 according to the first embodiment. The magnetic tape device 300 includes an interface unit 302, an IO control unit 303, an MPU 304, a data control unit 305, a magnetic head 306, a motor control unit 307, a motor 308, a magnetic tape 309, and a guide roller sensor 310. Prepare. It differs from the prior art in that there is a guide roller sensor 310.

  Read / write commands from the host device 301 are sent to the MPU 304 via the interface unit 302 and the IO control unit 303.

  The MPU 304 controls the magnetic tape device according to a program stored in a program storage medium (not shown). Examples of the program storage medium include a semiconductor memory, a magnetic disk, a magnetic tape, and an optical disk such as a CD-ROM and a DVD (Digital Versatile Disk). Further, the MPU 304 may control the magnetic tape device according to a program downloaded from a server or the like via a communication medium in addition to following the program stored in the program storage medium.

  When downloading a program via a program storage medium or a communication medium, the program may be operated while being read directly from the server of the download source, or the program is stored in the storage unit from the program storage medium or server, and the storage unit (not shown) It is also possible to operate while reading the stored program. The storage unit needs to be able to read and write, and is generally a RAM (Random Access Memory).

  The MPU 304 sends a read / write processing command to the data control unit 305 via the IO control unit 303. When the read / write processing is completed without causing a read / write error, the normal end is reported to the host device 301 via the IO control unit 303 and the interface unit 302. When a read / write error signal and a position error signal are received from the data control unit 305, retry processing for issuing a read / write processing command up to a specified number of times is performed.

  The MPU 304 sends a running direction command to the motor control unit 307, keeps the running speed of the magnetic tape 309 constant by the hall signal output in conjunction with the rotation of the motor 308 sent from the motor control unit 307, and controls the motor 308. Drive. The MPU 304 receives a signal from the guide roller sensor 310 and monitors a rotation speed (rotation speed in the circumferential direction of the guide roller) obtained from the rotation period of the guide roller.

  FIG. 4 is a functional block diagram showing functions characteristic of the present invention in the MPU 304. The MPU 304 includes a speed comparison unit 3041 and a tape travel speed setting unit 3042. The speed comparison unit 3041 detects the tape running speed derived from the hall signal output along with the rotation of the motor 308 sent from the motor control unit 307, and the rotation monitoring sensor of the guide rollers 103b and 103c (see FIG. 2). And a rotational speed derived from a guide roller sensor (including 105a, 105b, etc.). As a result of comparing the traveling speeds of the guide rollers 103b and 103c and the magnetic tape, when the traveling speed of the magnetic tape is different from at least one of the guide rollers 103b or 103c (that is, the rotational speed of the guide roller is higher than the magnetic tape). The tape running speed setting unit 3042 determines that it cannot follow the running speed of the magnetic tape, and the tape running speed setting unit 3042 cannot follow the running speed of the magnetic tape. The tape running speed corresponding to the rotational speed of the guide roller 103a or 103b or both is set. Then, the motor control unit 307 is instructed to reduce the tape running speed to that speed. The motor control unit 307 drives the motor 308 while maintaining the traveling direction and the changed speed as instructed.

  Further, the cycle of data to be written / read changes as the running speed changes. Therefore, the MPU 304 instructs the data control unit 305 to control the data at a data cycle that has been slowed down to the rotational speed of the guide rollers 103b and 103c that cannot be followed at the normal traveling speed.

  If the comparison between the rotation speed of the guide rollers 103b and 103c and the traveling speed of the magnetic tape 309 in the speed comparison unit 3041 proves that the guide rollers 103b and 103c still do not follow, the tape speed setting unit 3042 further follows. The low-speed mode is set further than the rotational speed of the guide rollers 103b and 103c that cannot be used. Here, as an example, it is 10% slower. The motor controller 307 is instructed to slow down the tape running speed to a speed that is 10% slower. Further, it instructs the data control unit 305 to control the data at a data cycle delayed by 10%. Then, the MPU 304 again causes the data control unit 305 to perform read / write processing. If the guide rollers 103b and 103c cannot follow even if the read / write process within the specified number of retries and the tape running speed are reduced, the MPU 304 passes the IO control unit 303 and the interface unit 302 to the host device 301. It is reported that a mechanical abnormality has occurred in the magnetic tape device 300.

  The description will be given with reference to FIG. 3 again. The data control unit 305 is responsible for sending signals and data in accordance with instructions received from the MPU 304, and at the time of writing, converts the data received from the host device 301 via the IO control unit 303 into a data method for recording on a medium. At the time of reading, conversion to data recognizable by the host device 301 is performed. At the time of writing, data is sent from the data control unit 305 to the magnetic head 306, and at the time of reading, the data is read from the magnetic head and converted into data that can be recognized by the host device 301 and sent to the IO control unit 303. Further, the data is controlled at the data cycle instructed by the MPU 304.

  In the magnetic tape device 300 intended to be used for backup, since the reliability of data is important, an error check for checking the validity of data is performed by the data control unit 305. The data control unit 305 transmits a data error signal to the MPU 304 when the data read / write process is not normally completed. Then, the blur of the magnetic tape 309 is corrected in the movable magnetic head 106 (see FIG. 1). If the blur of the magnetic tape 309 cannot be corrected by the movable magnetic head 106, a position error signal that becomes active when the correction cannot be corrected is sent to the MPU 304 via the IO control unit 303.

The magnetic head 306 is a magnetic head portion of the movable magnetic head 106 shown in FIGS. At the time of writing, an operation of writing data sent from the data control unit 305 to the magnetic tape 309 is performed. At the time of reading, the data recorded on the magnetic tape 309 is read and sent to the data control unit 305.

(Operation)
FIG. 5 is a flowchart of data write / read operations in the magnetic tape device 300 according to the first embodiment. If the magnetic tape 41 writes / reads data (s401) and there is no read / error in the recorded data and the data can be read normally (s402, No), the process ends normally (s403). If a read / error is detected (s402, Yes), an attempt is made to correct the tape shake by the movable magnetic head 106 (s404). If no position error signal is generated (s405, No), any error not caused by the guide roller will occur. Since writing / reading did not end normally due to a factor, writing / reading is performed a specified number of times as before (s406, No → s401 → s402, Yes → s404 → s405, No → s406 →...).

  When a position error signal is generated (s405, Yes), and when a data error occurs even after a specified number of retry operations (s406, No → s401 → s402, Yes → s404 → s405, No → s406 →... ) Compares the rotation speed of the guide roller with the traveling speed of the tape (s407), and when the rotation speed of the guide roller normally follows the traveling speed of the tape (s408, Yes), the rotation tracking of the guide roller. Since a position error has occurred at a location unrelated to, the process ends abnormally (s409).

  If the rotation speed of the guide roller does not normally follow the running speed of the tape (s408, No), the running speed of the magnetic tape is reduced to the rotation speed of the guide roller when it cannot follow the running speed of the tape. (S410), writing / reading processing is performed in a data cycle in accordance with the rotation speed of the guide roller (s411, No → s401). Still, when the rotation speed of the guide roller does not follow the running speed of the magnetic tape (second and subsequent times) (s402, Yes → s404 → s405 → s406 → s407 → s408, No), the running speed of the tape could not be followed. Decelerate further than the rotation speed of the guide roller. Here, the speed is reduced by about 10%. In a state where the speed is reduced by about 10%, writing / reading processing is performed at a data cycle in accordance with the running speed of the tape (s410). If it does not end normally within the specified number of retries (s411, Yes), it ends abnormally (s409).

With the configuration and operation described in the first embodiment of the present invention, tape blurring can be suppressed, and data writing / reading performance can be improved. The reason is as follows. If the guide roller does not follow the tape running speed for some reason, the guide roller follows the tape running by comparing the rotation speed of the guide roller with the running speed of the magnetic tape instead of performing the specified number of retries. Control the running speed of the tape as possible. That is, when the traveling speed of the magnetic tape is faster, the traveling speed of the magnetic tape is reduced.

Next, a second embodiment of the present invention will be described in detail with reference to FIGS. Description of the same points as in the first embodiment will be omitted, and different points will be described.
(Constitution)
FIG. 6 is a functional block diagram showing functions characteristic of this embodiment of the MPU 304 in the second embodiment. The MPU 304 includes a speed comparison unit 3041, a tape travel speed setting unit 3042, and a data transfer speed setting unit 3043. Compared to FIG. 4, the MPU 304 is provided with a data transfer rate setting unit 3043. In the data transfer rate setting unit 3043, a standard value of the data transfer rate is set in advance. When no read / write error is reported from the data control unit 305 via the IO control unit, the data transfer rate is set to be high.

  The tape running speed setting unit 3042 changes the tape running speed to the corresponding speed by changing the data transfer speed setting, and instructs the motor control unit 307 to perform the tape running at that speed.

The speed comparison unit 3041 obtains information on the rotational speeds of the guide rollers 103b and 103c from the guide roller sensor 310 and the tape obtained from the motor control unit 307 when the tape travel speed setting is changed in the tape travel speed setting unit 3042. Compare travel speed. The subsequent processing is the same as in the first embodiment.

(Operation)
FIG. 7 shows a flowchart of data write / read operations in the magnetic tape device 300 of the second embodiment. Compared with FIG. 5, the processing is greatly different between the processing of s402 and s403, that is, the processing of s505 to s512 is newly inserted between s502 and s510. When data is written / read (s501) and a read / write error occurs (s502, Yes), a retry process is performed a specified number of times until no read / write error occurs (s503, No → s501 → s502). If a read / write error occurs even after retrying the specified number of times (s502, Yes → s503, Yes), the process ends abnormally.

  If no read / write error has occurred (No in s502), the data transfer rate setting unit 3043 changes the preset standard value of the data transfer rate to set a transfer rate faster than the standard value (s505). ). Here, as an example, it is about 10% faster. Next, the tape running speed is changed to a speed that matches the changed data transfer speed (s506). The travel speed of the changed tape and the rotation speed of the guide roller are compared (s507), and if the guide roller is following (s508, Yes), it is confirmed whether there is a data error or a position error (s509). If not (s509, Yes), the process ends normally (s510), and the writing / reading operation can be performed at a higher transfer speed.

When the guide rollers 103b and 103c do not follow (s508, NO), when there is a read / write error or a position error (s509, Yes), and when the specified number of retries has not been reached (s512, No), The data transfer speed is lowered (s511), and the processing from s506 to s508 is performed. The tape running speed is varied up to the specified number of retries (s512) to read and write data. When the number of retries is over (s512, Yes), the process ends abnormally (s504). With the configuration and operation described in the second embodiment of the present invention, communication can be performed at a high data transfer rate within the range in which the guide roller can be followed. It is possible to improve the device performance. The reason is that the tape running speed is set to a high speed and the tape running speed is gradually reduced when the tape cannot be read / written normally. It is because it becomes possible to raise.

  Here, in the second embodiment, in the case of Yes in the process of s502, the process of abnormal termination s504 is performed through the process of whether the specified retry has been performed (s503). However, the processing shown in the flowchart of the first embodiment and FIG. 5 may be performed. Examples thereof are shown in FIGS.

  8 and 9 are modifications of the data write / read operation flowchart in the magnetic tape device 300 of the second embodiment. A, B, and C indicate corresponding portions between the flowcharts of FIGS. 8 and 9, respectively. Compared to the second embodiment shown in FIG. 7, the processing is the same as that of the first embodiment when the result of s502 is Yes. A specific description of the operation is substantially the same as the description of FIGS. In the first embodiment, the tape running speed setting unit 3042 sets the tape running speed in the low speed mode in s518 after the determination of the speed comparison unit 3041 in s516 without using the data transfer speed setting unit 3043. In this modified example, the operation may be performed in such a manner. After the data transfer speed setting unit 3043 sets the data transfer speed to a low speed, the tape travel speed setting unit sets the tape travel speed to ( (Low speed) may be set.

In this modification, when a read / write error occurs, the effect of improving the data write / read performance by suppressing the blurring of the tape, and when no read / write error occurs Thus, it is possible to perform communication at a high data transfer rate within a range in which the guide roller can follow, and it is possible to achieve both the effects of improving the device performance.

It is the figure which showed the running system 300 of the magnetic tape apparatus in Example 1 of this invention. It is the figure which looked at the running system of the magnetic tape apparatus 300 shown in FIG. 1 from the side. 1 is a diagram illustrating an internal configuration of a magnetic tape device 300 according to a first embodiment. 3 is a functional block diagram showing functions characteristic of the present invention in the MPU 304. FIG. 4 is a flowchart of data write / read operations in the magnetic tape device 300 according to the first embodiment. It is the functional block diagram which showed the characteristic function in the present Example of MPU304 in Example 2. FIG. 7 is a flowchart of data write / read operations in the magnetic tape device 300 according to the second embodiment. 10 is a modification of the data write / read operation flowchart in the magnetic tape device 300 according to the second embodiment. 10 is a modification of the data write / read operation flowchart in the magnetic tape device 300 according to the second embodiment. FIG. 10 is a diagram showing a running system in a conventional magnetic tape device 700. FIG. 6 is a diagram showing an internal configuration of a conventional magnetic tape device 700. 6 is a flowchart of data write / read operations in a conventional magnetic tape device 700.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Traveling system of magnetic tape apparatus 300 101 Supply reel motor 102 Take up reel motor 103a, 103b, 103c, 103d Guide roller 105a, 105b Reflective sensor 106 Movable magnetic head 107 Base 111 Forward traveling 112 Reverse traveling 300 Magnetic tape apparatus 301 Upper level Device 302 Interface unit 303 IO control unit 304 MPU
3041 Speed comparison unit 3042 Tape travel speed setting unit 3043 Data transfer speed setting unit 305 Data control unit 306 Magnetic head 307 Motor control unit 308 Motor 309 Magnetic tape 310 Guide roller sensor 600 Travel system 603a, 603b, 603c of magnetic tape device 700 603d guide roller 606 movable magnetic head 607 base 700 magnetic tape device

Claims (17)

In a magnetic tape device including a guide roller rotatably supported on a base while being in contact with the magnetic tape in order to bring the magnetic tape into contact with the magnetic head,
A speed comparison unit that compares the rotational speed of the guide roller and the traveling speed of the magnetic tape;
And a tape running speed setting unit configured to reduce the running speed of the magnetic tape when the running speed of the magnetic tape is higher. A guide roller pivotally supported on the base so as to be rotatable while contacting the magnetic tape to bring the magnetic tape into contact with the magnetic head;
A motor controller for detecting and controlling the running speed of the magnetic tape;
A guide roller sensor for detecting the rotation speed of the guide roller;
An MPU for controlling the magnetic tape device,
The MPU is a speed comparison unit that compares the traveling speed of the magnetic tape informed from the motor control unit and the rotational speed of the guide roller informed from the guide roller sensor;
When the traveling speed of the magnetic tape is faster, a tape traveling speed setting unit that sets the traveling speed of the magnetic tape slower in the motor control unit, and
The magnetic tape device, wherein the motor control unit causes the tape to run at the running speed of the magnetic tape set by the tape running speed setting unit. After the motor control unit has run the tape at the running speed of the magnetic tape set by the tape running speed setting unit,
The speed comparison unit further compares the traveling speed of the magnetic tape and the rotational speed of the guide roller,
When the traveling speed of the magnetic tape is faster, the tape traveling speed setting unit sets the traveling speed of the magnetic tape further to the motor control unit,
3. The magnetic tape device according to claim 2, wherein the motor control unit causes the tape to run at the running speed of the magnetic tape set by the tape running speed setting unit. In a magnetic tape device including a guide roller rotatably supported on a base while being in contact with the magnetic tape in order to bring the magnetic tape into contact with the magnetic head,
A data transfer rate setting unit for setting the transfer rate of the data faster than a preset rate;
A tape travel speed setting unit that changes the travel speed of the magnetic tape to a travel speed that matches the set data transfer speed;
A speed comparison unit that compares the rotational speed of the guide roller and the traveling speed of the magnetic tape;
When the traveling speed of the magnetic tape is faster, the data transfer speed setting unit sets the data transfer speed slower,
The magnetic tape device, wherein the tape travel speed setting unit changes the travel speed of the magnetic tape to a travel speed that matches the data transfer speed set to be slower. A guide roller pivotally supported on the base so as to be rotatable while contacting the magnetic tape to bring the magnetic tape into contact with the magnetic head;
A motor controller for detecting and controlling the running speed of the magnetic tape;
A guide roller sensor for detecting the rotation speed of the guide roller;
An MPU for controlling the magnetic tape device,
The MPU has a data transfer rate setting unit for setting a transfer rate of the data faster than a preset rate;
A tape travel speed setting unit for setting the travel speed of the magnetic tape to a travel speed according to the set data transfer speed;
A speed comparison unit that compares the traveling speed of the magnetic tape informed from the motor control unit and the rotational speed of the guide roller informed from the guide roller sensor;
The motor control unit runs the tape at the running speed set by the tape running speed setting unit,
When the traveling speed of the magnetic tape is higher in the comparison result in the speed comparison unit, the data transfer rate setting unit sets the data transfer rate slower,
The tape running speed setting unit changes the setting to the running speed of the magnetic tape in accordance with the data transfer speed that has become slow,
The magnetic tape device, wherein the motor control unit runs the tape at the running speed of the magnetic tape set by the tape running speed setting unit. After the motor control unit has run the tape at the running speed of the magnetic tape set by the tape running speed setting unit,
The speed comparison unit further compares the traveling speed of the magnetic tape and the rotational speed of the guide roller,
When the traveling speed of the magnetic tape is faster, the data transfer speed setting unit sets the data transfer speed further slower,
The tape running speed setting unit changes the setting to the running speed of the magnetic tape in accordance with the data transfer speed that has become slow,
6. The magnetic tape device according to claim 5, wherein the motor control unit travels the tape at the traveling speed of the magnetic tape set by the tape traveling speed setting unit. In a magnetic tape device including a guide roller rotatably supported on a base while being in contact with the magnetic tape in order to bring the magnetic tape into contact with the magnetic head,
When an error occurs in reading or writing data to the magnetic tape, or when the data transfer speed is set faster than the speed set by the data transfer speed setting unit, the rotation speed of the guide roller A speed comparison unit for comparing the traveling speed of the magnetic tape;
When an error occurs in reading or writing data to the magnetic tape, and the traveling speed of the magnetic tape is faster, the traveling speed of the magnetic tape is set slower,
When the data reading or writing to the magnetic tape is normally performed, the data transfer speed is set faster than a preset speed,
After setting the data transfer speed faster than a preset speed, the speed comparison unit compares the rotation speed of the guide roller and the traveling speed of the magnetic tape. The data transfer rate setting unit for setting the data transfer rate slower when the data is fast,
And a tape running speed setting unit that changes the running speed of the magnetic tape to a running speed that matches the set data transfer speed. In a magnetic tape device control method comprising a guide roller rotatably supported on a base while being in contact with the magnetic tape in order to bring the magnetic tape into contact with the magnetic head,
A method of controlling a magnetic tape device, comprising comparing the rotational speed of the guide roller and the traveling speed of the magnetic tape, and decelerating the traveling speed of the magnetic tape speed when the traveling speed of the magnetic tape is faster. After reducing the running speed of the magnetic tape speed,
Further comparing the traveling speed of the magnetic tape and the rotational speed of the guide roller,
When the traveling speed of the magnetic tape is faster, set the traveling speed of the magnetic tape further slower in the motor control unit,
9. The magnetic tape device control method according to claim 8, wherein the tape is run at the running speed of the magnetic tape set by the tape running speed setting unit. In a magnetic tape device control method, comprising a guide roller rotatably supported on a base while being in contact with the magnetic tape to bring the magnetic tape into contact with the magnetic head, and transferring data read from the magnetic tape to a host device.
Set the data transfer speed faster than a preset speed,
Change the traveling speed of the magnetic tape to the traveling speed according to the set data transfer speed,
Compare the rotational speed of the guide roller and the traveling speed of the magnetic tape,
If the traveling speed of the magnetic tape is faster, set the data transfer speed slower,
A method of controlling a magnetic tape device, wherein the traveling speed of the magnetic tape is changed to a traveling speed that matches the data transfer speed set to be slower. After changing the running speed of the magnetic tape to a running speed that matches the transfer speed of the data set slower,
Further comparing the traveling speed of the magnetic tape and the rotational speed of the guide roller,
When the traveling speed of the magnetic tape is faster, set the data transfer speed further slower,
Change the setting to the running speed of the magnetic tape to match the slow transfer speed of the data,
11. The magnetic tape device control method according to claim 10, wherein the tape is run at a running speed of the magnetic tape set by the tape running speed setting unit. In a magnetic tape device control method comprising a guide roller rotatably supported on a base while being in contact with the magnetic tape in order to bring the magnetic tape into contact with the magnetic head,
When an error occurs in reading or writing data to the magnetic tape,
Compare the rotational speed of the guide roller and the traveling speed of the magnetic tape, and if the traveling speed of the magnetic tape is faster, reduce the traveling speed of the magnetic tape speed,
When reading or writing of data to the magnetic tape is normally performed,
Set the data transfer speed faster than a preset speed,
Change the traveling speed of the magnetic tape to the traveling speed according to the set data transfer speed,
Compare the rotational speed of the guide roller and the traveling speed of the magnetic tape,
If the traveling speed of the magnetic tape is faster, set the data transfer speed slower,
A method of controlling a magnetic tape device, wherein the traveling speed of the magnetic tape is changed to a traveling speed that matches the data transfer speed set to be slower. Control means for a magnetic tape device comprising a guide roller rotatably supported on a base in contact with the magnetic tape in order to bring the magnetic tape into contact with the magnetic head,
Comparison means for comparing the rotational speed of the guide roller and the traveling speed of the magnetic tape;
Tape running speed setting means for reducing the running speed of the magnetic tape when the running speed of the magnetic tape is faster,
Tape device control program to function as a computer. After the tape running speed setting means decelerates the running speed of the tape,
The speed comparing means functions again as means for comparing the traveling speed of the magnetic tape and the rotational speed of the guide roller,
14. The magnetic tape device control program according to claim 13, which causes the tape running speed setting means to function as means for decelerating the running speed of the magnetic tape speed again when the running speed of the magnetic tape is higher. A magnetic tape device having a guide roller for bringing a magnetic tape having a guide roller rotatably supported on a base in contact with the magnetic tape so as to contact the magnetic head with the magnetic head. Control means,
Data transfer rate setting means for setting the transfer rate of the data faster than a preset rate;
Tape running speed setting means for changing the running speed of the magnetic tape to a running speed that matches the set data transfer speed;
Speed comparison means for comparing the rotational speed of the guide roller and the running speed of the magnetic tape;
Means for setting the data transfer speed setting means to a slower data transfer speed when the traveling speed of the magnetic tape is faster;
A magnetic tape device control program for causing the tape running speed setting means to function as means for changing the running speed of the magnetic tape to a running speed that matches the data transfer speed set to be slower. After the tape running speed setting means functions as a means for changing the running speed of the magnetic tape to a running speed that matches the transfer speed of the data set slower,
The speed comparing means functions again as means for comparing the traveling speed of the magnetic tape and the rotational speed of the guide roller,
When the traveling speed of the magnetic tape is faster, the data transfer speed setting means again as a means for setting the data transfer speed slower,
As means for changing the setting of the tape running speed setting means to the running speed of the magnetic tape in accordance with the data transfer speed that has become slow again,
16. The program for controlling a magnetic tape device according to claim 15, wherein the motor control means is caused to function again as means for running the tape at the running speed of the magnetic tape set by the tape running speed setting unit. Control means for a magnetic tape device comprising a guide roller rotatably supported on a base in contact with the magnetic tape in order to bring the magnetic tape into contact with the magnetic head,
When an error occurs in reading or writing data to the magnetic tape, or when the data transfer speed is set faster than a preset speed by the data transfer speed setting means, the rotation speed of the guide roller and As a speed comparison means for comparing the traveling speed of the magnetic tape,
When an error occurs in reading or writing data to the magnetic tape and the traveling speed of the magnetic tape is faster, the traveling speed of the magnetic tape is set slower,
When the data reading or writing to the magnetic tape is normally performed, the data transfer speed is set faster than a preset speed,
After the data transfer speed is set faster than a preset speed, the speed comparison means compares the rotation speed of the guide roller and the traveling speed of the magnetic tape. As a result, the traveling speed of the magnetic tape is greater. The data transfer rate setting means for setting the transfer rate of the data slower when it is faster;
A magnetic tape device control program for functioning as a tape travel speed setting means for changing the travel speed of the magnetic tape to a travel speed that matches the set data transfer speed.

Images