WO2022054402A1

WO2022054402A1 - Information processing device, information processing method, and information processing program

Info

Publication number: WO2022054402A1
Application number: PCT/JP2021/026639
Authority: WO
Inventors: 豊大石; 浩司松村; 理貴近藤; 優子宇野
Original assignee: 富士フイルム株式会社
Priority date: 2020-09-11
Filing date: 2021-07-15
Publication date: 2022-03-17
Also published as: JPWO2022054402A1

Abstract

This information processing device performs a process of deriving a movement path of a magnetic head at the time of reading user data to be read recorded in a first area of magnetic tape having the first area, which is for recording user data, and a second area, which is located on the outer side of the first area in a tape travel direction. The information processing device derives a path through which the magnetic head passes at least once over the second area as the movement path of the magnetic head.

Description

Information processing equipment, information processing methods, and information processing programs

The disclosed technology relates to information processing devices, information processing methods, and information processing programs.

The following techniques are known regarding the movement control of the magnetic head when reading the data recorded on the magnetic tape.

For example, Japanese Patent Application Laid-Open No. 6-12451 describes a reciprocating recording type magnetic tape device in which the traveling direction of a tape is folded back by detecting a lap mark recorded at a folding point near the end of the tape in the forward direction. If the lap mark on the side is not detected, run to the physical tape end position of the magnetic tape, fold the tape, and continue reading the recorded data on the opposite direction on condition that the lap mark on the opposite direction is detected. At the same time, if the lap mark on the forward side is normal and the lap mark on the reverse side is not detected, reading of the recorded data on the reverse side can be continued from the time when the lap mark on the forward side is folded back. Are listed.

Japanese Patent Application Laid-Open No. 2000-76740 states that in a magnetic recording / reproducing device that records / reproduces information by scanning the recording surface of a magnetic tape with a magnetic head, when an instruction to suspend or stop recording is given, a certain period of time is specified. It is described that after the lapse of time, the recording area of the magnetic tape on which information is recorded by the magnetic head is retracted in a direction away from the scanning position by the magnetic head, and the unused area of the magnetic tape is positioned at the scanning position. There is.

Japanese Patent Application Laid-Open No. 6-2315113 describes a magnetic recording / playback device provided with a recording head that records a reverse marker output by a reverse marker generating circuit on a magnetic tape.

The user data recorded on the magnetic tape is recorded in the first area provided along the traveling direction of the magnetic tape (hereinafter referred to as the traveling direction of the tape). The second area provided outside the tape traveling direction with respect to the first area is, for example, an area used as a calibration area for servo and recording / reproduction, and management information and the like are recorded.

When reading the user data recorded in the first area of the magnetic tape, the magnetic head reads the data while inverting (folding back) the moving direction relative to the magnetic tape on the first area. Since the magnetic head moves in contact with the magnetic tape, the movement of the magnetic head scrapes the surface of the magnetic tape and generates shavings (debris). If the magnetic tape is wound with debris accumulated on the magnetic tape, the magnetic tape may be damaged. Debris is thought to accumulate on the magnetic tape, especially when the direction of movement of the magnetic head is reversed (folded back). Therefore, if the moving direction of the magnetic head is reversed on the first area, debris may be accumulated in the first area, making it difficult to read the user data.

The disclosed technology was made in view of the above circumstances, and aims to suppress the accumulation of debris in the recording area of the user data of the magnetic tape.

The information processing apparatus according to the disclosed technique is a first area of a magnetic tape having a first area for recording user data and a second area arranged outside the tape traveling direction with respect to the first area. An information processing device including at least one processor that performs a process of deriving a movement path of a magnetic head when reading user data to be read recorded in an area. The processor has a magnetic head as a movement path. A route that passes over the area 2 at least once is derived.

It is preferable that the processor derives as a moving path a path in which the moving direction of the magnetic head relative to the magnetic tape is reversed on the second area. Further, it is preferable that the processor derives as a moving path a path in which the moving direction of the magnetic head relative to the magnetic tape does not reverse on the first area.

The processor may derive the movement route after including the data other than the user data recorded in the second area as the reading target. Also. Even if the processor identifies the boundary position between the first area and the second area, includes the user data whose distance from the boundary position is within a predetermined range as dummy data in the reading target, and then derives the movement route. good.

Further, the processor may set dummy data for each of the plurality of laps provided in the first area. In this case, the processor is from the terminal boundary of the magnetic tape for laps in which the direction of movement of the magnetic head relative to the magnetic tape when reading the user data recorded on the magnetic tape is the first direction. User data within a predetermined range is set as dummy data, and the relative movement direction of the magnetic head with respect to the magnetic tape when reading the user data recorded on the magnetic tape is opposite to the first direction. For the lap in the second direction, user data whose distance from the boundary position on the starting end side of the magnetic tape is within a predetermined range may be set as dummy data.

It is preferable that the processor accelerates / decelerates the traveling speed of the magnetic tape when reading the user data only when the magnetic head is on the second area.

The information processing method according to the disclosed technique is a first area of a magnetic tape having a first area for recording user data and a second area arranged outside the tape traveling direction with respect to the first area. It is an information processing method for deriving the movement path of the magnetic head when reading the user data to be read recorded in the area, and the magnetic head passes over the second area at least once as the movement path. This is an information processing method in which at least one processor included in the information processing apparatus executes a process of deriving a route.

The information processing program according to the disclosed technique is a first area of a magnetic tape having a first area for recording user data and a second area arranged outside the tape traveling direction with respect to the first area. It is an information processing program for causing at least one processor of the information processing apparatus to execute a process of deriving a moving path of a magnetic head when reading user data to be read recorded in an area, and the moving path is magnetic. This is an information processing program for causing a processor to execute a process of deriving a path through which the head passes on the second area at least once.

According to the disclosed technology, it is possible to suppress the accumulation of debris in the recording area of the user data of the magnetic tape.

It is a figure which shows an example of the structure of the recording / reproduction system which concerns on embodiment of the disclosed technique. It is a figure which shows the data recording method of the magnetic tape which concerns on embodiment of the disclosed technique. It is a functional block diagram which shows an example of the functional structure of the tape drive which concerns on embodiment of the disclosed technique. It is a figure which shows the setting example of the dummy data which concerns on embodiment of the disclosed technique. It is a figure which shows the setting example of the dummy data which concerns on embodiment of the disclosed technique. It is a figure which shows an example of the movement path of the magnetic head which concerns on embodiment of the disclosed technique. It is a figure which shows an example of the movement path of the magnetic head which concerns on embodiment of the disclosed technique. It is a flowchart which shows an example of the flow of information processing which concerns on embodiment of the disclosed technique. It is a figure which shows an example of the movement path of the magnetic head which concerns on a comparative example.

Hereinafter, an example of the embodiment of the disclosed technology will be described with reference to the drawings. The same reference numerals are given to the same or equivalent components and parts in each drawing, and duplicate description will be omitted as appropriate.

FIG. 1 is a diagram showing an example of the configuration of the recording / reproducing system 1 according to the embodiment of the disclosed technology. The recording / playback system 1 includes a server 10 and a tape drive 20. The tape drive 20 is connected to the server 10. The tape drive 20 is loaded with a magnetic tape cartridge 30.

The magnetic tape cartridge 30 includes a magnetic tape 31 on which information is recorded by magnetism and a cartridge memory 32 which is a recording medium different from the magnetic tape 31. An example of the magnetic tape 31 is an LTO (Linear Tape-Open) tape. The cartridge memory 32 can be realized by, for example, an RFID (Radio Frequency IDentifier) tag capable of recording and reading information in a non-contact manner. In the cartridge memory 32, for example, the position information of the data recorded on the magnetic tape 31, the usage history of the magnetic tape 31, the error log, and various other management information are recorded.

The tape drive 20 records (writes) data on the magnetic tape 31 and reads data from the magnetic tape 31 based on instructions from the server 10. The tape drive 20 includes a magnetic head 21 that records and reproduces the magnetic tape 31, and a control unit 22 that controls recording and reproduction of the magnetic tape 31. The control unit 22 includes a processor 23 such as a PLD (Programmable Logic Device) and a non-volatile memory 25 that stores an information processing program 24 as firmware. The tape drive 20 is an example of an information processing device in the disclosed technology.

FIG. 2 is a diagram showing a data recording method of the magnetic tape 31. In the present embodiment, the data recording method of the magnetic tape 31 employs a linear recording method for recording data along the tape traveling direction. The magnetic tape 31 has a plurality of areas divided along the tape traveling direction. User data is recorded in the first area R1 of the magnetic tape 31. A second area R2 is provided outside the tape traveling direction with respect to the first area R1. The second area R2 is an area used as, for example, a servo and a calibration area for recording / reproduction, and user data is not recorded in the second area R2. In the second area R2, for example, a data set including management information and the like is recorded. This dataset is sometimes referred to as the housekeeping dataset.

The magnetic tape 31 has a plurality of wraps, which are band-shaped recording areas along the tape traveling direction, in the first area R1. When recording data in the first area R1, the magnetic head 21 included in the tape drive 20 first has the magnetic tape 31 from the BOT (Beginning Of Tape) side (starting end side) to the EOT (End Of Tape) side (terminating side). ) (That is, in the forward direction), the data is recorded on the first lap while moving relative to the magnetic tape 31. When the data recording position reaches the end of the first lap on the EOT side, the magnetic head 21 moves relative to the magnetic tape 31 from the EOT side toward the BOT side (that is, in the opposite direction) in the second lap. Record the data in. When the data recording position reaches the end of the BOT side of the second lap, the magnetic head 21 records the data on the third lap while moving relative to the magnetic tape 31 from the BOT side to the EOT side. go. In this way, the magnetic head 21 records data on each lap while reversing the data recording direction.

Further, in reading the data recorded in each lap, the magnetic head 21 reads the data while moving relative to the same direction as the data recording direction. For example, when reading the data recorded in the first lap, the magnetic head 21 reads the data while moving relative to the magnetic tape 31 from the BOT side to the EOT side. The relative movement of the magnetic head 21 along the tape traveling direction is performed by the magnetic tape 31 traveling along the tape traveling direction.

The server 10 gives an instruction to record user data on the magnetic tape 31 and an instruction to read the user data recorded on the magnetic tape 31 to the tape drive 20.

FIG. 3 is a functional block diagram showing an example of the functional configuration of the tape drive 20 when the user data to be read is read from the magnetic tape 31. The tape drive 20 includes a reception unit 40, a boundary position specifying unit 41, a dummy data setting unit 42, a route derivation unit 43, and a reading unit 44. When the processor 23 executes the information processing program 24, the tape drive 20 functions as a reception unit 40, a boundary position specifying unit 41, a dummy data setting unit 42, a route derivation unit 43, and a reading unit 44.

The reception unit 40 receives an instruction to read user data. The read instruction is accompanied by the identification information of the user data to be read. The read instruction is, for example, issued from a user terminal (not shown) connected to the server 10 via a network. When the server 10 receives the read instruction transmitted from the user terminal, the server 10 transfers the read instruction to the tape drive 20 together with the identification information of the user data to be read.

The boundary position specifying unit 41 acquires boundary information indicating the boundary position between the first area R1 and the second area R2 on the magnetic tape 31 on which the user data to be read specified in the reading instruction is recorded. The boundary information may be, for example, information indicating the number of blocks of user data recorded in each lap of the first area R1. The boundary position specifying unit 41 specifies the boundary position between the first area R1 and the second area R2 as a block address for each lap by integrating the number of blocks acquired as the boundary information. For example, when the number of blocks of user data recorded in the first lap in which the data recording direction (reading direction) is forward is, for example, 10,000, the boundary position specifying unit 41 sets the block address 10000 in the first lap. , The boundary position (EOT side) between the first area R1 and the second area R2 is specified. Further, when the number of blocks of user data recorded in the second lap in which the data recording direction (reading direction) is opposite is, for example, 9000, the boundary position specifying unit 41 has the number of blocks of 10000 in the first lap. The block address 19000, which is the sum of the number of blocks of the second lap of 9000, is specified as the boundary position (BOT side) between the first area R1 and the second area R2 in the second lap.

Information indicating the number of blocks of user data recorded in each lap is recorded in the cartridge memory 32. The boundary position specifying unit 41 acquires the information recorded in the cartridge memory 32 as boundary information, and integrates the number of blocks for each lap indicated by the boundary information to obtain the first area R1 and the second area R1 for each lap. The boundary position with the area R2 of is specified. When information regarding the positions of the first area R1 and the second area R2 is recorded as format information in the cartridge memory 32, this information may be used as boundary information.

When the recorded area in which the user data is recorded is one lap or more, the dummy data setting unit 42 is within a predetermined range in which the distance from the boundary position specified by the boundary position specifying unit 41 is relatively short (that is,). User data (near the boundary position) is included in the read target as dummy data. The boundary position specifying unit 41 may set the user data recorded at the position closest to the boundary position between the first area R1 and the second area R2 as dummy data. The dummy data setting unit 42 sets dummy data for each lap in which user data is recorded. Note that the user data specified as the reading target in the reading instruction may correspond to dummy data.

FIG. 4A is a diagram showing an example of setting dummy data when the recorded area in which user data is recorded is one lap or more. In FIG. 4A, reference numeral D1 is user data to be read specified in the reading instruction. The dummy data setting unit 42 has a boundary position A1 on the EOT side for laps (first lap and third lap in the example of FIG. 4A) in which the data recording direction (reading direction) is the forward direction (first direction). User data recorded in the vicinity of is set as dummy data D2, and laps in which the data recording direction (reading direction) is opposite (second direction) (second lap and fourth lap in the example of FIG. 4A). As for, the user data recorded in the vicinity of the boundary position A2 on the BOT side is set as the dummy data D2.

When the recorded area in which the user data is recorded is less than one lap, the user data does not exist in the vicinity of the boundary position between the first area R1 and the second area R2, so that the user data is in the first area R1. Dummy data D2 cannot be set. In this case, as shown in FIG. 4B, the dummy data setting unit 42 sets data other than the user data recorded in the second area R2 (for example, a housekeeping data set) as dummy data. When the dummy data setting unit 42 reads the user data D1 recorded in the lap in which the data recording direction (reading direction) is the forward direction, the dummy data setting unit 42 is recorded in the second area R2 on the EOT side as shown in FIG. 4B. The data is set as dummy data D2. On the other hand, when the dummy data setting unit 42 reads the user data D1 recorded in the lap in which the data recording direction (reading direction) is opposite, the dummy data setting unit 42 dummy the data recorded in the second area R2 on the BOT side. Set as data D2.

The route derivation unit 43 sets the movement path of the magnetic head 21 for reading the user data D1 to be read specified in the read instruction received by the reception unit 40 and the dummy data D2 set by the dummy data setting unit 42, respectively. Derived. The route derivation unit 43 derives the movement path of the magnetic head 21 by using a known path derivation algorithm such as the nearest neighbor method and the pairwise method.

FIG. 5A is a diagram showing an example of a movement route when dummy data D2 is set in the first area R1. As an example, the route derivation unit 43 starts reading from the beginning of the lap for each lap, and without moving between the laps, the dummy data D2 set for the lap is used as the last data to be read in the lap. Derive the movement path to read. Specifically, as shown in FIG. 5A, for the first lap, reading is started from the end on the BOT side, which is the start end position, and the dummy data D2 set for the first lap without moving between laps. Is read as the last data to be read in the first lap, then the reading is started from the end on the EOT side, which is the start position, for the second lap, and the second lap is performed without moving between the laps. The set dummy data D2 is read as the last data to be read in the second lap, and thereafter, a movement path for reading the data in the third and fourth laps is derived. That is, the magnetic head 21 moves linearly from the start end to the end of each lap, and derives a movement path for sequentially scanning each lap. The movement path shown in FIG. 5A is a path in which the inversion of the movement direction of the magnetic head 21 does not occur on the first area R1.

FIG. 5B is a diagram showing an example of the movement path of the magnetic head 21 when the dummy data D2 is set in the second area R2. In this case, it is assumed that the data D1 to be read exists only in a single wrap. In this case, the route derivation unit 43 starts reading from the start end of the lap to be read, and reads the dummy data D2 set in the second area R2 as the last data to be read without moving between the laps. Derive the movement route. In this case, the moving direction of the magnetic head 21 is not reversed, and the magnetic head 21 stops on the second area R2.

The reading unit 44 controls to read user data while moving the magnetic head 21 according to the movement path derived by the route deriving unit 43. As a result, the user data D1 and the dummy data D2 to be read specified in the read instruction are read. When the dummy data D2 corresponds to the user data D1 to be read specified in the reading instruction, the reading unit 44 transmits both the read user data D1 and the dummy data D2 to the server 10. On the other hand, when the dummy data D2 does not correspond to the user data D1 to be read specified in the read instruction, the reading unit 44 discards the read dummy data D2 and transmits only the read user data D1 to the server 10. ..

FIG. 6 is a flowchart showing an example of a processing flow executed by the processor 23 of the tape drive 20 executing the information processing program 24. The information processing program 24 is executed, for example, when a user data reading instruction is transmitted from the server 10.

In step S1, the reception unit 40 receives an instruction to read user data. In step S2, the boundary position specifying unit 41 accesses the cartridge memory 32, acquires boundary information indicating the boundary position between the first area R1 and the second area R2 on the magnetic tape 31, and is based on this boundary information. The boundary position between the first area R1 and the second area R2 is specified.

In step S3, when the recorded area in which the user data is recorded is one lap or more, the dummy data setting unit 42 sets each lap in which the user data is recorded from the boundary position specified in step S2. User data whose distance is within a predetermined range is set as dummy data D2, and dummy data D2 is included in the reading target. On the other hand, when the recorded area in which the user data is recorded is less than one lap, the data other than the user data (for example, the housekeeping data set) recorded in the second area R2 is set as the dummy data D2. , Dummy data D2 is included in the reading target.

In step S4, the route derivation unit 43 derives the movement path of the magnetic head 21 for reading the user data D1 to be read specified in the read instruction received in step S1 and the dummy data D2 set in step S3, respectively. do.

In step S5, the reading unit 44 controls to read the user data while moving the magnetic head 21 according to the movement path derived in step S4. The reading unit 44 reads the user data D1 and the dummy data D2 to be read specified in the reading instruction. When the dummy data D2 corresponds to the user data D1 to be read specified in the reading instruction, the reading unit 44 transmits both the read user data D1 and the dummy data D2 to the server 10. On the other hand, when the dummy data D2 does not correspond to the user data D1 to be read specified in the read instruction, the reading unit 44 discards the read dummy data D2 and transmits only the read user data D1 to the server 10. ..

Since the magnetic head 21 moves in contact with the magnetic tape 31, the movement of the magnetic head 21 scrapes the surface of the magnetic tape 31 to generate shavings (debris). If the magnetic tape 31 is wound with debris accumulated on the magnetic tape 31, the magnetic tape 31 may be damaged. Debris is considered to be deposited on the magnetic tape 31 particularly when the moving direction of the magnetic head 21 is reversed (folded back). Therefore, if the moving direction of the magnetic head 21 is reversed on the first area R1, debris may be accumulated in the first area R1 and it may be difficult to read the user data recorded in the first area R1. .. Debris is also considered to accumulate on the magnetic tape 31 when the magnetic head 21 moves between laps.

FIG. 7 is a diagram showing an example of the movement path of the magnetic head 21 according to the comparative example. In the comparative example shown in FIG. 7, the point that dummy data is not set is different from the embodiment of the disclosed technique. The movement route shown in FIG. 7 is an example of a movement route for relatively shortening the reading time. According to this example, the reversal of the moving direction of the magnetic head 21 occurs a plurality of times on the first area R1. Further, the movement of the magnetic head 21 between the laps also occurs a plurality of times on the first area R1. Therefore, according to the movement path according to the comparative example, debris may be accumulated on the first area R1 of the magnetic tape 31.

On the other hand, according to the tape drive 20 according to the embodiment of the disclosed technique, when the recorded area in which the user data is recorded is one lap or more, as shown in FIG. 5A, the magnetic head 21 is each. In the lap, after reading the dummy data D2 set in the first area R1, the vehicle decelerates and stops, and then the moving direction is reversed. Since the dummy data D2 exists in the vicinity of the boundary position between the first area R1 and the second area R2, the magnetic head 21 moves onto the second area R2 by inertia after reading the dummy data D2. Therefore, the reversal of the moving direction of the magnetic head 21 occurs on the second area R2, and the frequency of the reversing of the moving direction of the magnetic head 21 on the first area R1 is suppressed. Debris accumulation in area R1 can be suppressed. On the other hand, when the recorded area in which the user data is recorded is less than one lap, as shown in FIG. 5B, the dummy data D2 set in the second area R2 is read, and then deceleration and stop are performed. .. That is, the magnetic head 21 stops on the second area R2. This makes it possible to suppress the accumulation of debris in the first area R1.

As described above, in the tape drive 20 according to the embodiment of the disclosed technique, the magnetic head 21 is the second moving path of the magnetic head 21 when reading the user data recorded in the first area R1 of the magnetic tape 31. Since a path that passes over the area R2 at least once is derived, it is possible to suppress the accumulation of debris in the first area R1. As illustrated in FIG. 5A, the reversal of the moving direction of the magnetic head 21 derives a moving path that does not occur on the first area R1, thereby promoting the effect of suppressing the accumulation of debris in the first area R1. Will be done.

For the derivation of the movement route, for example, route derivation algorithms such as the nearest neighbor method and the pairwise method are used, and dummy data D2 is set in the vicinity of the boundary position between the first area R1 and the second area R2. Therefore, no matter what route derivation algorithm is used, it is possible to suppress the frequency of inversion of the moving direction of the magnetic head 21 on the first area R1. By setting the dummy data D2 for each of the plurality of laps in which the user data to be read is recorded, the frequency of inversion of the moving direction of the magnetic head 21 on the first area R1 is further suppressed, and the frequency of occurrence is further suppressed. The frequency with which movement of the magnetic head 21 between laps occurs on the first area R1 is also suppressed. Therefore, the effect of suppressing the accumulation of debris in the first area R1 can be promoted.

By setting dummy data D2 in at least one lap in which the data recording direction (reading direction) is forward and at least one lap in which the data recording direction (reading direction) is opposite, magnetic It is possible to suppress the frequency of reversal of the moving direction of the head 21 on the first area R1, and it is possible to suppress the accumulation of debris in the first area R1.

Further, in the present embodiment, when the recorded area in which the user data is recorded is one lap or more, the user data recorded in the vicinity of the boundary position between the first area R1 and the second area R2. Was set as dummy data D2 as an example. However, even in this case, the data recorded in the second area R2 (for example, the housekeeping data set) may be set as the dummy data D2.

Further, a path derivation algorithm may be used in which the magnetic head 21 moves linearly from the start end to the end of each lap and derives a movement path for sequentially scanning each lap. In this case, the movement path as shown in FIG. 5A is derived without setting the dummy data D2.

Further, the processor 23 of the tape drive 20 may control the acceleration / deceleration of the traveling speed of the magnetic tape 31 when reading the user data so as to perform acceleration / deceleration only when the magnetic head 21 is on the second area R2. .. In other words, when the magnetic head 21 is on the first area R1, it may be controlled so as not to accelerate or decelerate the traveling speed of the magnetic tape 31. Thereby, the effect of suppressing the accumulation of debris in the first area R1 can be promoted.

Further, in the present embodiment, the case where each process shown in the flowchart of FIG. 6 is executed by the processor 23 included in the tape drive 20 is illustrated, but the present invention is not limited to this embodiment. A processor (not shown) included in the server 10 may execute a part of these processes. For example, the processor included in the server 10 may execute the process related to the setting of the dummy data D2 (step S3).

In the above embodiment, for example, a hardware-like processing unit that executes various processes such as a reception unit 40, a boundary position specifying unit 41, a dummy data setting unit 42, a route derivation unit 43, and a reading unit 44. As the structure, various processors shown below can be used. As described above, the various processors include a CPU, which is a general-purpose processor that executes software (program) and functions as various processing units, and a processor whose circuit configuration can be changed after manufacturing an FPGA or the like. It includes a dedicated electric circuit, which is a processor having a circuit configuration specially designed for executing a specific process such as a programmable logic device (PLD), an ASIC (Application Specific Integrated Circuit), and the like.

One processing unit may be composed of one of these various processors, or a combination of two or more processors of the same type or different types (for example, a combination of a plurality of FPGAs or a combination of a CPU and an FPGA). It may be composed of a combination). Further, a plurality of processing units may be configured by one processor.

As an example of configuring a plurality of processing units with one processor, first, one processor is configured by a combination of one or more CPUs and software, as represented by a computer such as a client and a server. There is a form in which the processor functions as a plurality of processing units. Second, as typified by System on Chip (SoC), there is a form that uses a processor that realizes the functions of the entire system including multiple processing units with one IC (Integrated Circuit) chip. be. As described above, the various processing units are configured by using one or more of the above-mentioned various processors as a hardware-like structure.

Further, as the hardware structure of these various processors, more specifically, an electric circuit (circuitry) in which circuit elements such as semiconductor elements are combined can be used.

Further, in the above embodiment, the mode in which the information processing program 24 is stored (installed) in the memory 25 in advance has been described, but the present invention is not limited to this. The information processing program 24 is provided in a form recorded on a recording medium such as a CD-ROM (Compact Disc Read Only Memory), a DVD-ROM (Digital Versatile Disc Read Only Memory), and a USB (Universal Serial Bus) memory. May be good. Further, the information processing program 24 may be downloaded from an external device via a network.

The disclosure of Japanese patent application 2020-153268 filed on September 11, 2020 is incorporated herein by reference in its entirety. Also, all documents, patent applications and technical standards described herein are to the same extent as if the individual documents, patent applications and technical standards were specifically and individually stated to be incorporated by reference. , Incorporated by reference herein.

Claims

The reading target recorded in the first area of the magnetic tape having a first area for recording user data and a second area arranged outside the tape traveling direction with respect to the first area. An information processing device including at least one processor that performs a process of deriving a movement path of a magnetic head when reading user data.
The processor
An information processing device that derives a path through which the magnetic head passes over the second area at least once as the movement path.
The information processing device according to claim 1, wherein the processor derives a path in which the moving direction of the magnetic head relative to the magnetic tape is reversed on the second area as the moving path.
The information processing apparatus according to claim 1 or 2, wherein the processor derives a path in which the moving direction of the magnetic head relative to the magnetic tape does not reverse on the first area as the moving path. ..
The information processing according to any one of claims 1 to 3, wherein the processor includes data other than the user data recorded in the second area as a reading target and derives the movement route. Device.
The processor identifies the boundary position between the first area and the second area.
The information processing apparatus according to claim 1 or 2, wherein the user data whose distance from the boundary position is within a predetermined range is included in the reading target as dummy data, and then the movement path is derived.
The information processing apparatus according to claim 5, wherein the processor sets the dummy data for each of a plurality of laps provided in the first area.
For laps in which the direction of movement of the magnetic head relative to the magnetic tape when reading user data recorded on the magnetic tape is the first direction, the processor is the boundary on the end side of the magnetic tape. The user data whose distance from the position is within a predetermined range is set as the dummy data, and the moving direction of the magnetic head with respect to the magnetic tape when reading the user data recorded on the magnetic tape is the first. For the lap which is the second direction opposite to the direction of 1, the user data whose distance from the boundary position on the start end side of the magnetic tape is within a predetermined range is set as the dummy data. The information processing apparatus according to 6.
One of claims 1 to 7, wherein the processor accelerates / decelerates the traveling speed of the magnetic tape when reading the user data only when the magnetic head is on the second area. The information processing device described in.
The reading target recorded in the first area of the magnetic tape having a first area for recording user data and a second area arranged outside the tape traveling direction with respect to the first area. It is an information processing method that performs processing to derive the movement path of the magnetic head when reading user data.
An information processing method in which at least one processor of the information processing apparatus performs a process of deriving a path through which the magnetic head passes over the second area at least once as the movement path.
The reading target recorded in the first area of the magnetic tape having a first area for recording user data and a second area arranged outside the tape traveling direction with respect to the first area. An information processing program for causing at least one processor of an information processing apparatus to execute a process of deriving a movement path of a magnetic head when reading user data.
An information processing program for causing the processor to execute a process of deriving a path through which the magnetic head passes over the second area at least once as the movement path.