JP2011134417A - Onboard device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an onboard device 10 capable of obtaining a state that correct data are written in an HDD even under a hostile environment with various vibrations. <P>SOLUTION: When detecting the fact that vibrations larger than predetermined one are applied to the HDD 16 while writing data in the HDD 16, the onboard device 10 writes the data again in the HDD 16. Alternatively, the device 10 checks whether or not the data are correctly written in the HDD16, and writes the data again in the HDD16 as long as the data are not written correctly. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an in-vehicle device mounted on a vehicle, and more particularly to an in-vehicle device having a built-in HDD (Hard Disk Drive).

  In Patent Document 1 below, it is determined that the HDD environment is out of the normal operation guarantee range when the vibration level applied to the HDD exceeds a predetermined vibration level in an in-vehicle audio system equipped with the HDD. In this case, waiting for the HDD environment to return to the normal operation guarantee range, for all audio files recorded in the HDD, an error check using an error correction code (ECC) recorded in the HDD; An in-vehicle audio system that corrects an error of an audio file in which an error has occurred is disclosed.

JP 2005-56473 A

  By the way, in an in-vehicle device having an HDD, data may be written to the HDD while the vehicle is traveling, and if a large vibration is applied to the HDD during data writing, the data may not be written correctly. If incorrect data is written in the HDD, if an ECC is created based on the incorrect data, the corrected data is still used even if the data in the HDD is corrected using the ECC. Incorrect data remains when writing.

  Although it is conceivable to check whether or not data has been written correctly every time data is written to the HDD, it takes an enormous amount of time for processing with the limited computer resources of the in-vehicle device. In the technique disclosed in Patent Document 1, it is assumed that data is correctly written in advance in the HDD, and consideration is given to a case where erroneous data is written due to vibration or the like during traveling of the vehicle. It has not been.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to realize a state in which correct data is written in the HDD even in an environment with a lot of vibration.

  In order to solve the above-described problems, the present invention provides, for example, an in-vehicle device mounted on a vehicle, a data acquisition unit that acquires data from the outside, and data acquired by the data acquisition unit is represented by an HDD (Hard Disk Drive ), A vibration determination unit that determines whether or not vibration exceeding a predetermined magnitude is applied to the HDD while data is being written to the HDD by the data writing unit, and a vibration When the determination unit determines that vibration exceeding a predetermined size is applied to the HDD while data is being written to the HDD by the data writing unit, the data acquisition unit acquires the data writing unit. The vehicle-mounted device is provided with a rewrite instruction unit that rewrites the data to the HDD.

  According to the in-vehicle device of the present invention, it is possible to realize a state in which correct data is written in the HDD even in an environment with a lot of vibration.

It is a block diagram which shows the structure of the vehicle-mounted apparatus 10 in one Embodiment of this invention. 3 is a block diagram illustrating an example of a detailed configuration of an application processing unit 19. FIG. 3 is a block diagram illustrating an example of a detailed configuration of a vibration determination unit 17. FIG. 4 is a flowchart showing an example of the operation of the in-vehicle device 10. It is a flowchart which shows an example of rewriting process (S200). It is a hardware block diagram which shows an example of a structure of the computer 30 which implement | achieves the function of the vehicle equipment 10. It is a flowchart which shows the other example of rewriting process (S200).

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram illustrating a configuration of an in-vehicle device 10 according to an embodiment of the present invention. The in-vehicle device 10 includes a data acquisition unit 11, a temporary storage memory 12, a data writing unit 13, an error determination unit 14, a rewrite instruction unit 15, an HDD 16, and an application processing unit 19.

  The HDD 16 includes a vibration determination unit 17 and a data storage unit 18. In the data storage unit 18, for example, map data, road data, music data, and the like are stored. The application processing unit 19 uses the data stored in the data storage unit 18 to execute processing such as route search and music data reproduction.

  FIG. 2 is a block diagram illustrating an example of a detailed configuration of the application processing unit 19. The application processing unit 19 includes a current position calculation unit 190, a route search unit 191, a route guidance unit 192, and a music data playback unit 193. The sensor 21 is, for example, a GPS (Global Positioning System) receiver, an orientation sensor, a distance sensor, and the like. The sensor 21 measures a GPS signal transmitted from a geodetic satellite, a traveling direction of the vehicle, a moving distance of the vehicle, and the like. The current position calculation unit 190 is supplied.

  The current position calculation unit 190 is based on the measurement information supplied from the sensor 21 and the road data stored in the data storage unit 18 every time the vehicle on which the vehicle-mounted device 10 is mounted moves, for example, a predetermined distance (for example, 10 m). For example, the current position of the vehicle is calculated by map matching or the like, and information indicating the calculated current position and traveling direction of the vehicle is provided to the route search unit 191 and the route guidance unit 192.

  The route search unit 191 receives the search information including the coordinates of the departure point, the destination point, and the waypoint, the search condition, and the like from the user via the input device 22 such as a touch panel. Based on the search information, a route from the departure point to the destination point is searched based on the search information using an algorithm such as the Dijkstra method, and the search result is displayed on the display device 23.

  When the route search unit 191 receives information specifying any of the routes searched for by the user via the input device 22, the route search unit 191 sends the route specified by the user to the route guide unit 192 as a guide route. Note that the route search unit 191 may perform a route search using the current position of the vehicle as a departure point.

  When the route guidance unit 192 receives information indicating the guidance route from the route search unit 191, the route guidance unit 192 acquires map data in the vicinity of the current position of the vehicle stored in the data storage unit 18, and the map indicated by the acquired map data The route guidance is started by displaying an image in which a car mark indicating the current position of the vehicle is superimposed on the display device 23.

  Then, the route guiding unit 192 refers to the current position of the vehicle calculated by the current position calculating unit 190 and the road data stored in the data storage unit 18 and travels within a predetermined distance ahead of the vehicle on the guided route. When there is a guidance point for which a direction is to be indicated, an image relating to the guidance point is displayed on the display device 23, and a voice indicating guidance is reproduced via the speaker 24 to guide the direction to be advanced.

  The music data playback unit 193 acquires the corresponding music data from the data storage unit 18 and plays back the acquired music data through the speaker 24 when the user instructs the playback of the music data through the input device 22. To do.

  When the recording medium 20 such as a DVD (Digital Versatile Disk), a CD (Compact Disc), or a memory card is mounted on the in-vehicle device 10, the data acquisition unit 11 responds to an instruction from the rewrite instruction unit 15. A data block of a predetermined size is read from the recording medium 20 and the read data is held in the temporary holding memory 12. The temporary holding memory 12 is a semiconductor memory, for example.

  The data writing unit 13 writes the data held in the temporary holding memory 12 to the data storage unit 18 in the HDD 16. The data storage unit 18 includes, for example, a magnetic head and a magnetic disk, causes the magnetic head to generate a magnetic field according to the data received from the data writing unit 13, and forms a magnetization pattern according to the generated magnetic field on the magnetic disk. As a result, the data received from the data writing unit 13 is stored in the magnetic disk. In addition, the data writing unit 13 notifies the vibration determination unit 17 of the start of data writing before writing data to the data storage unit 18, and when the data writing ends, the vibration determination unit 17 is notified.

  For example, as shown in FIG. 3, the vibration determination unit 17 includes a sensor 171, a counter 172, and a vibration determination processing unit 173. The sensor 171 increments the value of the counter 172 (for example, increases it by 1) when vibration exceeding a predetermined magnitude is applied to the HDD 16.

  The vibration determination processing unit 173 reads and holds the value of the counter 172 when notified of the start of data writing from the data writing unit 13. When the data writing unit 13 is notified of the completion of data writing, the vibration determination processing unit 173 reads the value of the counter 172, the value of the read counter 172, and the value of the held counter 172. Compare

  When the value of the read counter 172 is different from the value of the held counter 172, the vibration determination processing unit 173 writes data in the data storage unit 18 in the HDD 16 by the data writing unit 13. In the meantime, it is determined that the vibration exceeding the predetermined magnitude is applied to the HDD 16, and the fact is notified to the error determination unit 14 and the rewrite instruction unit 15.

  On the other hand, when the read value of the counter 172 matches the value of the held counter 172, the vibration determination processing unit 173 has the data written in the data storage unit 18 in the HDD 16 by the data writing unit 13. In the meantime, it is determined that the vibration exceeding the predetermined magnitude has not been applied to the HDD 16, and this is notified to the error determination unit 14 and the rewrite instruction unit 15.

  The error determination unit 14 is determined by the vibration determination unit 17 that a vibration exceeding a predetermined size is applied to the HDD 16 while the data writing unit 13 writes the data to the data storage unit 18 in the HDD 16. In this case, the data of the block written immediately before is read from the data storage unit 18 and the data of the block corresponding to the data is read from the temporary holding memory 12.

  Then, the error determination unit 14 determines whether the data read from the data storage unit 18 and the data read from the temporary storage memory 12 match, so that the data is correctly written in the data storage unit 18. It is determined whether or not, and the determination result is notified to the rewrite instruction unit 15.

  The rewriting instruction unit 15 indicates that the vibration exceeding the predetermined size is applied to the HDD 16 while the data writing unit 13 writes the data to the data storage unit 18 in the HDD 16. When notified from 17, the data writing unit 13 is instructed to rewrite data in the temporary storage memory 12.

  When the error determination unit 14 determines that the data has not been correctly written in the data storage unit 18, the rewrite instruction unit 15 instructs the data writing unit 13 to rewrite the data in the temporary storage memory 12. . On the other hand, when the error determination unit 14 determines that the data has been correctly written in the data storage unit 18, the rewrite instruction unit 15 erases the data in the temporary storage memory 12 and reads the next data block as data. The acquisition unit 11 is instructed.

  Further, the rewrite instructing unit 15 indicates that vibration exceeding the predetermined size was not applied to the HDD 16 while the data writing unit 13 was writing the data to the data storage unit 18 in the HDD 16. Even when notified from the vibration determination unit 17, the data in the temporary storage memory 12 is erased and the data acquisition unit 11 is instructed to read the next data block.

  FIG. 4 is a flowchart illustrating an example of the operation of the in-vehicle device 10. For example, when the recording medium 20 is mounted on the in-vehicle device 10 and the user gives an instruction to write data via an input device (not shown), the in-vehicle device 10 starts the operation shown in this flowchart.

  The sensor 171 in the vibration determination unit 17 starts monitoring whether or not vibration exceeding a predetermined magnitude is applied to the HDD 16 after the vehicle-mounted device 10 is turned on. When a vibration exceeding the specified magnitude is applied, a process of incrementing the value of the counter 172 is executed.

  First, the data acquisition unit 11 reads a data block of a predetermined size from the loaded recording medium 20, and holds the read data in the temporary storage memory 12 (S100). Then, the data writing unit 13 notifies the vibration determination unit 17 of the start of data writing.

  Here, when the data acquisition unit 11 reads out the size-sized data block from the recording medium 20 and holds it in the temporary storage memory 12, if there is vibration when writing the data in the temporary storage memory 12 to the HDD 16, the data acquisition unit 11 again A large-sized data block needs to be written to the HDD 16, and the time required for rewriting may be long.

  On the other hand, when the data acquisition unit 11 reads out a data block of a small size from the recording medium 20 and stores it in the temporary storage memory 12, the time required for rewriting is reduced, but for the entire data to be written, In some cases, the overhead for the read and write processes increases as a whole.

  Therefore, the size of the data block that the data acquisition unit 11 reads at a time and stores in the temporary storage memory 12 takes into account the relationship between the processing capability of the in-vehicle device 10 and the occurrence frequency of vibration exceeding a predetermined size. And predetermined by a system designer or the like.

  Returning to FIG. 4, the description will be continued. The vibration determination processing unit 173 in the vibration determination unit 17 reads and holds the value of the counter 172 (S101). Then, the data writing unit 13 writes the data block in the temporary storage memory 12 to the data storage unit 18 in the HDD 16 (S102), and notifies the vibration determination unit 17 of the completion of data writing.

  Next, the vibration determination processing unit 173 reads the value of the counter 172 (S103), and whether or not the read value of the counter 172 is different from the value of the counter 172 read and held in step S101, that is, While data is being written to the data storage unit 18 in the HDD 16 by the data writing unit 13, it is determined whether or not vibration exceeding a predetermined magnitude is applied to the HDD 16 (S104).

  When vibration exceeding a predetermined size is applied to the HDD 16 while data is being written to the data storage unit 18 in the HDD 16 by the data writing unit 13 (S104: Yes), the in-vehicle device 10 is described later. The rewriting process is executed (S200).

  On the other hand, when data exceeding the predetermined size is not applied to the HDD 16 while the data writing unit 13 writes the data to the data storage unit 18 in the HDD 16 (S104: No), the rewriting is performed. The instruction unit 15 erases the data in the temporary storage memory 12 (S105), and instructs the data acquisition unit 11 to read the next data block.

  Next, the data acquisition unit 11 determines whether or not all data to be written has been written (S106). When all the data to be written is not written (S106: No), the data acquisition unit 11 executes the process shown in step S100 again. On the other hand, when all the data to be written has been written (S106: Yes), the in-vehicle device 10 ends the operation shown in this flowchart.

  FIG. 5 is a flowchart illustrating an example of the rewrite process (S200).

  First, the rewrite instruction unit 15 resets and starts the timer value T built in the in-vehicle device 10 to 0 (S201), and rewrites the data in the temporary holding memory 12 to the data writing unit 13 To instruct. The data writing unit 13 writes the data held in the temporary holding memory 12 again into the data storage unit 18 in the HDD 16 (S202).

  Next, the error determination unit 14 reads out the written block data from the data storage unit 18 (S203). Then, the error determination unit 14 reads the data of the block corresponding to the data read from the data storage unit 18 from the temporary holding memory 12, the data read from the data storage unit 18, the data read from the temporary holding memory 12, By determining whether or not the two match, it is determined whether or not the data is correctly written in the data storage unit 18 (S204).

  When the data is not correctly written in the data storage unit 18 (S204: No), the rewrite instruction unit 15 instructs the data write unit 13 to rewrite the data in the temporary holding memory 12, and the data write The unit 13 executes the process shown in step S202 again.

On the other hand, if the data is correctly written into the data storage unit 18 (S204: Yes), rewrite instruction unit 15 is greater than the value t ₁ the value T of the timer built in the vehicle-mounted device 10 has a predetermined It is determined whether or not (S205). The predetermined value t ₁ is, for example, 5 minutes. When the value T of the timer built in the in-vehicle device 10 exceeds a predetermined value t ₁ (S205: Yes), the rewrite instruction unit 15 executes the process shown in step S105.

On the other hand, when the value T of the timer built in the in-vehicle device 10 does not exceed the predetermined value t ₁ (S205: No), the rewrite instruction unit 15 erases the data in the temporary storage memory 12. In step S105, the data acquisition unit 11 is instructed to read the next data block.

  Next, the data acquisition unit 11 determines whether all data to be written has been written (S207). When all the data to be written is written (S207: Yes), the in-vehicle device 10 ends the operation shown in the flowchart.

  On the other hand, when all the data to be written is not written (S207: No), the data acquisition unit 11 reads a data block of a predetermined size from the mounted recording medium 20, and holds the read data in the temporary storage memory 12. (S208). Then, the data writing unit 13 notifies the vibration determination unit 17 of the start of data writing.

  Next, the vibration determination processing unit 173 in the vibration determination unit 17 reads and holds the value of the counter 172 (S209). Then, the data writing unit 13 writes the data block in the temporary storage memory 12 to the data storage unit 18 in the HDD 16 (S210), and notifies the vibration determination unit 17 of the completion of data writing.

  Next, the vibration determination processing unit 173 reads the value of the counter 172 (S211), and whether or not the read value of the counter 172 is different from the value of the counter 172 read and held in step S209, that is, While data is being written to the data storage unit 18 in the HDD 16 by the data writing unit 13, it is determined whether or not vibration exceeding a predetermined magnitude is applied to the HDD 16 (S212).

  When the data writing unit 13 is writing data to the data storage unit 18 in the HDD 16 and the HDD 16 is not subjected to vibration exceeding a predetermined size (S212: No), the rewriting instruction unit 15 again executes the process shown in step S205. On the other hand, if vibration exceeding a predetermined size is applied to the HDD 16 while the data writing unit 13 is writing data to the data storage unit 18 in the HDD 16 (S212: Yes), a rewrite instruction The unit 15 executes the process shown in step S201 again.

  FIG. 6 is a hardware configuration diagram illustrating an example of the configuration of the computer 30 that implements the functions of the in-vehicle device 10. The computer 30 includes a central processing unit (CPU) 31, a random access memory (RAM) 32, a read only memory (ROM) 33, an HDD 34, an input / output interface (I / F) 35, and a media interface (I / F) 36. Prepare.

  The CPU 31 operates based on a program stored in the ROM 33 or the HDD 34 and controls each part. The ROM 33 stores a boot program executed by the CPU 31 when the computer 30 is started up, a program depending on the hardware of the computer 30, and the like.

  The HDD 34 stores a program executed by the CPU 31, data used by the program, and the like. The HDD 34 can constitute, for example, the HDD 16 (including the vibration determination unit 17 and the data storage unit 18) shown in FIG. The CPU 31 controls an output device such as a speaker and a display device and an input device such as a keypad, a touch panel, and a microphone via the input / output interface 35. The CPU 31 acquires data from the input device via the input / output interface 35. Further, the CPU 31 outputs the generated data to the output device via the input / output interface 35.

  The media interface 36 reads map data, music data, program data and the like stored in the recording medium 37 and provides them to the CPU 31 via the RAM 32. The CPU 31 writes map data, music data, and the like read from the recording medium 37 into the HDD 34. The media interface 36 corresponds to a so-called DVD mechanism, and can constitute, for example, the data acquisition unit 11 shown in FIG.

  The CPU 31 loads the program data read from the recording medium 37 from the recording medium 37 onto the RAM 32 via the media interface 36, and executes the loaded program. The CPU 31 can constitute, for example, the error determination unit 14, the rewrite instruction unit 15, and the application processing unit 19 shown in FIG. 1, and the RAM 32 constitutes the temporary holding memory 12 shown in FIG. be able to.

  The CPU 31 reads these programs from the recording medium 37 and executes them, but as another example, these programs may be acquired from other devices by wireless or wired communication. The recording medium 37 is, for example, an optical recording medium such as a DVD or PD (Phase change rewritable disk), a magneto-optical recording medium such as an MO (Magneto-Optical disk), a tape medium, a magnetic recording medium, or a semiconductor memory.

  The embodiment of the present invention has been described above.

  As is clear from the above description, according to the in-vehicle device 10 of the present embodiment, it is possible to realize a state in which correct data is written in the HDD even under an environment where there is a lot of vibration such as when the vehicle is running.

  In addition, this invention is not limited to above-described embodiment, Many deformation | transformation are possible within the range of the summary.

  For example, in the above-described embodiment, every time a predetermined block of data is written to the HDD 16, the in-vehicle device 10 determines whether or not vibration exceeding a predetermined size is applied to the HDD 16 during data writing. However, the present invention is not limited to this. For example, the in-vehicle device 10 determines whether or not vibration exceeding a predetermined magnitude is applied to the HDD 16 every predetermined time (for example, every minute), and determines that vibration exceeding a predetermined magnitude is applied. In this case, all the data written in the HDD 16 is determined until it is determined that vibration exceeding the predetermined magnitude has been applied this time since it was determined that vibration exceeding the predetermined magnitude was not applied last time. You may make it write again.

  Further, in the above-described embodiment, the in-vehicle device 10 has acquired the data to be stored in the HDD 16 from the recording medium 20, but the present invention is not limited to this, and the in-vehicle device 10 does not go through the recording medium 20. Data to be stored in the HDD 16 may be acquired from the outside of the in-vehicle device 10 by wireless or wired communication.

  In the above-described embodiment, the in-vehicle device 10 stores the data acquired from the recording medium 20 in the temporary storage memory 12. However, the present invention is not limited to this, and the in-vehicle device 10 rewrites the data in the HDD 16. At the stage of determining an error in the data written in the HDD 16, the corresponding block of data may be read again from the recording medium 20.

  In the embodiment described above, the vibration determination unit 17 is provided inside the HDD 16, but the present invention is not limited to this, and the vibration determination unit 17 may be provided outside the HDD 16. Only the vibration determination processing unit 173 may be provided outside the HDD 16. When only the vibration determination processing unit 173 of the vibration determination unit 17 is provided outside the HDD 16, the sensor 171 and the counter 172 of the vibration determination unit 17 are functions of a SMART (Self-Monitoring Analysis and Reporting Technology) that a general HDD has. It may be realized using.

  Further, in the above-described embodiment, while the data is being written in the data storage unit 18 in the HDD 16 by the data writing unit 13 in step S104 of FIG. When added (S104: Yes), the rewrite instruction unit 15 resets the value T of the timer built in the in-vehicle device 10 to 0 (S201 in FIG. 5), and then the data in the temporary storage memory 12 Is rewritten to the data writing unit 13, and the data writing unit 13 rewrites the data held in the temporary holding memory 12 into the data storage unit 18 in the HDD 16 (S202). Is not limited to this.

  For example, a process as indicated by a dotted line in FIG. 7 may be executed. That is, in step S104 of FIG. 4, when vibration exceeding a predetermined size is applied to the HDD 16 while the data writing unit 13 is writing data to the data storage unit 18 in the HDD 16 (S104: Yes), the rewrite instruction unit 15 resets the value T of the timer built in the in-vehicle device 10 to 0 (S201 in FIG. 7).

  Then, the error determination unit 14 reads the written block data from the data storage unit 18 (S220), reads the block data corresponding to the data read from the data storage unit 18 from the temporary storage memory 12, By determining whether or not the data read from the storage unit 18 matches the data read from the temporary storage memory 12, it is determined whether or not the data is correctly written in the data storage unit 18 (S221).

  When data is correctly written in the data storage unit 18 (S221: Yes), the rewrite instruction unit 15 executes the process shown in step S205. On the other hand, when the data is not correctly written in the data storage unit 18 (S221: No), the rewrite instruction unit 15 instructs the data writing unit 13 to rewrite the data in the temporary storage memory 12. The data writing unit 13 writes the data held in the temporary holding memory 12 again into the data storage unit 18 in the HDD 16 (S222), and the error determination unit 14 executes the process shown in step S220 again. .

  As a result, even when vibration exceeding a predetermined magnitude is applied to the HDD 16 during data writing, if the data is correctly written to the HDD 16, useless rewriting operation can be omitted. it can.

DESCRIPTION OF SYMBOLS 10 ... In-vehicle apparatus, 11 ... Data acquisition part, 12 ... Temporary holding memory, 13 ... Data writing part, 14 ... Error determination part, 15 ... Rewrite instruction | indication part, DESCRIPTION OF SYMBOLS 16 ... HDD, 17 ... Vibration determination part, 171 ... Sensor, 172 ... Counter, 173 ... Vibration determination processing part, 18 ... Data storage part, 19 ... Application processing part 20 ... recording medium, 30 ... computer, 31 ... CPU, 32 ... RAM, 33 ... ROM, 34 ... HDD, 35 ... input / output interface, 36 ... Media interface, 37... Recording medium

Claims (5)

An in-vehicle device mounted on a vehicle,
A data acquisition unit for acquiring data from the outside;
A data writing unit for writing the data acquired by the data acquisition unit to an HDD (Hard Disk Drive);
A vibration determining unit that determines whether or not vibration exceeding a predetermined size is applied to the HDD while data is being written to the HDD by the data writing unit;
When it is determined by the vibration determination unit that vibration exceeding a predetermined size is applied to the HDD while data is being written to the HDD by the data writing unit, the data writing unit An in-vehicle apparatus comprising: a rewrite instruction unit that rewrites the data acquired by the data acquisition unit to the HDD. The in-vehicle device according to claim 1,
When it is determined by the vibration determination unit that vibration exceeding a predetermined size is applied to the HDD while data is being written to the HDD by the data writing unit, the data is written into the HDD. An error determination unit for determining whether or not the data is incorrect,
The rewrite instruction unit
The data writing unit causes the data acquired by the data acquisition unit to be rewritten to the HDD only when the error determination unit determines that the data written in the HDD is incorrect. In-vehicle device. The in-vehicle device according to claim 2,
The error determination unit
After the vibration determination unit determines that vibration exceeding a predetermined size is applied to the HDD during the data writing to the HDD by the data writing unit, the predetermined period is Each time data is written to the HDD by the loading unit, it is determined whether the data written in the HDD is incorrect,
The rewrite instruction unit
When the error determination unit determines that the data written in the HDD is incorrect, the data writing unit causes the data acquired by the data acquisition unit to be rewritten to the HDD. In-vehicle device. The in-vehicle device according to any one of claims 1 to 3,
A semiconductor memory,
The data acquisition unit
Holds data acquired from outside in the semiconductor memory,
The error determination unit
If the data read from the HDD is different from the data held in the semiconductor memory, it is determined that the data written in the HDD is incorrect,
The data writing unit
The data stored in the semiconductor memory is rewritten to the HDD when the rewrite instruction unit instructs to rewrite the data acquired by the data acquisition unit to the HDD. In-vehicle device. The in-vehicle device according to any one of claims 1 to 4,
The vibration determination unit
A sensor for detecting a predetermined magnitude of vibration applied to the HDD;
A counter that increments a value when a predetermined amount of vibration applied to the HDD is detected by the sensor;
The data writing unit when the value of the counter before data is written to the HDD by the data writing unit is different from the value of the counter after data is written to the HDD by the data writing unit And a vibration determination processing unit that determines that vibration exceeding a predetermined magnitude is applied to the HDD while data is being written to the HDD.

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