JP4736594B2 - COMPOSITE STORAGE DEVICE, DATA WRITE METHOD, AND PROGRAM - Google Patents

Description

  The present invention includes a recording medium and a nonvolatile storage medium, and a composite storage device that writes and reads data based on a common file system, and data writing that writes data to the composite storage device The present invention relates to a method and a program.

  A hard disk device (hereinafter referred to as HDD (Hard Disc Drive)) is used as an external storage for a personal computer (PC) or the like, and its capacity has been increased with an increase in recording density. Application to various consumer AV devices such as the above is realized and expected.

  In addition, HDDs have become smaller in diameter, and for example, 1.8 inch and 1 inch HDDs are expected to be used in mobile devices such as digital still cameras (DSC) and portable music players.

  On the other hand, non-volatile semiconductor memory represented by Flash memory has advantages such as low power consumption, high-speed startup, and impact resistance, and its capacity has been increased beyond 1 GB, and it can be used for various applications depending on the application. Has been.

  By the way, as a small storage applied to a mobile device, low cost, large capacity, low power consumption, high-speed response, etc. are required.

  However, the HDD requires several seconds from turning on the power before reaching a so-called start state in which data can be recorded and reproduced. On the other hand, a nonvolatile semiconductor memory can be immediately activated and has excellent responsiveness. For example, data can be recorded / reproduced from the moment the device is turned on.

  Further, if the HDD is always in an idle state (recording / playback standby state), useless power consumption occurs, and the power efficiency of a mobile device having a limited power source capacity deteriorates. Further, when a defective sector is generated on a track, the HDD has a disadvantage that a transfer speed is deteriorated by a replacement process.

  Therefore, development of hybrid storage that fuses HDD and nonvolatile semiconductor memory is expected to compensate for the disadvantages of HDD with the advantages of nonvolatile semiconductor memory. The inventors of the present application have proposed various configurations for managing and utilizing such a hybrid storage with a single file system (see, for example, Patent Documents 1 to 4).

  For example, conventionally, system data necessary for accessing software and data for controlling the HDD controller is stored in a predetermined area of the HDD, and cannot be read unless the HDD is in an activated state. Therefore, until the system data is read from the HDD, the device cannot be used for a while after the device is turned on. Therefore, Patent Document 1 describes an invention in which system data is stored in a nonvolatile semiconductor memory and can be put into use immediately after the device is turned on.

  Further, as described above, it takes several seconds for the HDD to be able to record and reproduce data. Therefore, data cannot be recorded / reproduced until the HDD reaches the activated state. Therefore, in Patent Document 2, at the time of data recording, data for a predetermined time from the beginning is written into the nonvolatile semiconductor memory, the subsequent data is written into the HDD after activation, and at the time of data reproduction, the nonvolatile semiconductor memory The invention describes a configuration in which data is read out from the HDD and the subsequent data is read out from the activated HDD, and data can be recorded / reproduced immediately after the device is turned on.

  Also, cited document 3 describes an invention that prevents deterioration of transfer speed by using a nonvolatile semiconductor memory as a spare area even for defective sectors.

  Further, when the HDD is used for a video camera or the like, when the power supply is suddenly shut down due to dropping or impact during recording and the file system is not registered, the data reproduction operation becomes impossible. In order to prevent this, it is necessary to periodically update the file system in a predetermined area of the HDD. However, the recording speed is remarkably reduced by updating the file system. Therefore, cited document 4 describes an invention in which an area for updating a file system is allocated to a nonvolatile semiconductor memory, and data is protected without causing a deterioration in transfer speed.

  In this way, if a nonvolatile semiconductor memory is used only as a data area in a transitional state and an HDD is used in a steady state, a low-cost can be achieved by combining a small-capacity nonvolatile semiconductor memory and a large-capacity HDD. You can configure storage with good performance.

  In addition, the following has been proposed as a composite storage device including a sensor by the person other than the inventor of the present application (Patent Documents 5 to 6).

  In Patent Document 5, when the operation of the HDD cannot be performed or in a situation where there is a failure in the operation, writing to the non-volatile semiconductor memory is performed, and thereafter, when the operation of the HDD becomes possible, the non-volatile semiconductor memory to the HDD A technique has been proposed in which the nonvolatile semiconductor memory is treated as a temporary buffer and has a feature of writing back data.

  On the other hand, Patent Document 6 has a table for converting from LBA (logical address) of HDD to PBA (physical address) of nonvolatile semiconductor memory, and switching is performed according to conditions determined by the user and the sensor. Or a technique for writing to the HDD has been proposed.

JP 2003-123379 A JP 2003-125358 A JP 2002-150699 A JP 2000-324435 A JP 2000-251396 A JP 2004-164193 A

  By the way, when comparing the nonvolatile semiconductor memory and the HDD from the viewpoint of reliability, the operation guaranteed temperature covers a wider range in the nonvolatile semiconductor memory than in the HDD. In addition, since HDD involves a mechanical operation when accessing data, it has a characteristic that it is weak against vibration and shock.

  Here, the guaranteed range of the memory card (nonvolatile semiconductor memory) using the NAND flash memory is compared with the guaranteed range of the 1 inch to 1.8 inch HDD as the HDD.

The guaranteed operating temperature is 0 ° C. to 70 ° C. for a memory card using a NAND flash memory, whereas it is 5 ° C. to 60 ° C. for an HDD. Further, the guaranteed vibration limit during operation is 15 G (= 14.7 m / s ² ) for a memory card using a NAND flash memory, whereas it is 2 G (= 19.6 m / s ² ) for an HDD. Further, the permissible impact during operation is 3,000 G (29,400 m / s ² ) in the NAND flash memory, and 500 G (4,900 m / s ² ) in the HDD. It can be seen that in any parameter, the non-volatile semiconductor memory has a wider allowable range than the HDD.

  In addition, there is a demand for a technique for easily backing up management information for managing data written in an HDD or a nonvolatile solid-state memory and important data.

  Therefore, according to the present invention, a composite storage device capable of stably writing data even when vibration is applied from the outside during data writing, and data writing for writing data to the composite storage device An object is to provide a method and a program.

In order to solve the above-described problem, the composite storage device according to the present invention includes a recording medium having a first data area in which a first address is assigned to each cluster of a predetermined size, and each cluster of a predetermined size. A second data area to which a second address is assigned, a first address assigned to the first data area, and a second address assigned to the second data area An identification in which a part of the first address and a part of the second address are composed of the same logical address, and predetermined identification information is written for each logical address. a nonvolatile storage medium having information table, and an interface unit for the host device is connected, the data supplied from the host device via the interface unit the When writing to the recording medium or the non-volatile storage medium, on the basis of the identification information table, and retrieves a free cluster, writing data to the recording medium and / or the nonvolatile storage medium corresponding to the retrieved free cluster writing A storage unit, a sensor for detecting environmental information, and a write destination of data supplied from the host device via the interface unit based on the environmental information detected by the sensor from the recording medium to the nonvolatile storage medium Or a control unit that controls the writing unit to change from the non-volatile storage medium to the recording medium, and the sensor includes a temperature sensor that measures the internal temperature of the composite storage device, An acceleration sensor that detects a change in acceleration or speed applied to the composite memory device in each of three-dimensional directions, and the temperature A first signal indicating that the internal temperature of the composite storage device detected by the sensor is outside a predetermined range is generated and supplied to the control unit, and the composite storage detected by the acceleration sensor A second signal indicating that the acceleration or speed change applied to the apparatus is out of a predetermined range is generated and supplied to the control unit, and the control unit is supplied by the writing unit via the interface unit. When the first signal or the second signal is supplied from the sensor while writing data to the recording medium, the writing to the recording medium is stopped and the cluster that has been written to the recording medium The writing unit is controlled to write the data in the non-volatile storage medium .

In order to solve the above-mentioned problem, the present invention provides a recording medium having a first data area in which a first address is assigned to each cluster of a predetermined size, and a second medium for each cluster of a predetermined size. A logical address for managing a second data area to which an address is assigned, a first address assigned to the first data area, and a second address assigned to the second data area; And an identification information table in which a part of the first address and a part of the second address are configured by the same logical address, and predetermined identification information is written for each logical address. In a data writing method for writing data to a composite storage device having a nonvolatile storage medium and an interface unit to which a host device is connected, the interface unit is The data supplied from the host device by the time of writing on the recording medium or the non-volatile storage medium, on the basis of the identification information table, and retrieves a free cluster, the recording medium corresponding to the retrieved free cluster or / And a writing step for writing data to the nonvolatile storage medium, a temperature sensor for measuring the internal temperature of the composite storage device, and an acceleration or a speed change applied to the composite storage device in each of the three-dimensional directions. A detection step of detecting environmental information by a sensor comprising an acceleration sensor to detect , wherein in the detection step, the internal temperature of the composite memory device detected by the temperature sensor is outside a predetermined range; And a change in acceleration or speed applied to the composite storage device detected by the acceleration sensor is generated. Generates a second signal indicating that the temperature is out of a predetermined range, and generates a third signal indicating that the internal temperature of the composite memory device detected by the temperature sensor is within a predetermined range. And generating a fourth signal indicating that the acceleration or velocity change applied to the composite storage device detected by the acceleration sensor has returned to a predetermined range, and supplying data supplied via the interface unit. When writing to the recording medium, if the first signal or the second signal is generated by the sensor, the writing to the recording medium is stopped, and the cluster data written to the recording medium is stored. When writing to the non-volatile storage medium, and when the sensor generates the third signal or the fourth signal, the writing to the non-volatile storage medium is stopped and the non-volatile storage is performed. The cluster data written in the medium is written in the recording medium.

Furthermore, in order to solve the above-described problem , the present invention provides a recording medium having a first data area in which a first address is assigned to each cluster of a predetermined size, and a second medium for each cluster of a predetermined size. A logical address for managing a second data area to which an address is assigned, a first address assigned to the first data area, and a second address assigned to the second data area; And an identification information table in which a part of the first address and a part of the second address are configured by the same logical address, and predetermined identification information is written for each logical address. Program for causing a computer to execute a process of writing data to a composite storage device having a nonvolatile storage medium and an interface unit to which a host device is connected There are, the data supplied from the host device via the interface section when writing to the recording medium or the non-volatile storage medium, on the basis of the identification information table, and retrieves a free cluster retrieved free cluster A writing step of writing data to the recording medium and / or the nonvolatile storage medium corresponding to the above, a temperature sensor for measuring the internal temperature of the composite storage device, and a change in acceleration or speed applied to the composite storage device A detection step of detecting environmental information by a sensor constituted by an acceleration sensor that detects in each of three-dimensional directions, and in the detection step, the internal temperature of the composite memory device detected by the temperature sensor A first signal indicating that the value is out of a predetermined range, and the composite type detection detected by the acceleration sensor A second signal indicating that the acceleration or speed change applied to the device is out of the predetermined range is generated, and the internal temperature of the composite memory device detected by the temperature sensor is returned to the predetermined range. A third signal indicating that the acceleration or speed change applied to the composite storage device detected by the acceleration sensor has returned to a predetermined range, and generating the fourth signal. When the first signal or the second signal is generated by the sensor while writing data supplied via the recording medium, the writing to the recording medium is stopped, and the recording medium When the data of the cluster written in is written to the nonvolatile storage medium and the third signal or the fourth signal is generated by the sensor, the data to the nonvolatile storage medium is written. The writing is stopped, and the computer is caused to execute a process of writing the cluster data written in the nonvolatile storage medium to the recording medium .

  The present invention detects whether the temperature inside the composite storage device exceeds the upper limit or the lower limit of the operation guarantee temperature of the recording medium by a sensor provided in the composite storage device, and according to the detection Since the data writing destination is determined to be the recording medium or the nonvolatile solid-state memory, the data writing operation can be reliably performed without interruption within the guaranteed temperature range of the nonvolatile solid-state memory.

  Further, the present invention measures vibration applied to (applied to) the composite memory device itself by a sensor provided in the composite memory device, detects whether the recording medium exceeds the allowable range, and detects the detection. Accordingly, the data writing destination is determined to be the recording medium or the nonvolatile solid-state memory, and therefore the data writing operation can be performed without interruption within the guaranteed vibration range of the nonvolatile solid-state memory.

  Further, the present invention measures the impact strength applied (applied) to the composite storage device itself by the sensor provided in the composite storage device, and determines whether or not the allowable range for the impact of the recording medium is exceeded. According to the determination, the data writing destination is determined to be the recording medium or the nonvolatile solid-state memory, so that the data writing operation can be performed without interruption within the guaranteed impact range of the nonvolatile solid-state memory.

  Furthermore, the present invention measures the impact strength applied (applied) to the composite memory device itself, and detects whether or not the acceleration is continuously generated in the vicinity of 1 G (9.8 m / s2) for a predetermined time. For example, it is possible to protect the recording medium by retracting the recording / reproducing head built in the recording medium from the disk before the device collides with the ground due to free fall.

  The present invention has a hard disk storage device (Hard Disc Drive, HDD) on which a disk-shaped recording medium is mounted and a nonvolatile storage medium such as a FLASH memory, and the data area of the HDD and the nonvolatile storage medium based on a predetermined file system. This is related to a composite storage device that treats the data area as an integrated or partially integrated data area. In the following, an example in which an MS-DOS compatible FAT file system is adopted as the file system will be described.

  As shown in FIG. 1, the data access system 1 has a composite storage device (hybrid hard disk drive) 2 in which a recording medium and a non-volatile storage medium are combined in a standard such as IDE, SCSI, FC, or USB. A host device 4 is connected via an interface unit 3 that employs the above.

  The host device 4 includes a CPU 10 that performs predetermined arithmetic processing, a memory 11 that is used for arithmetic operations by the CPU 10, and an interface control unit 12 that transmits / receives data and control information to / from the composite storage device.

  Specifically, the host device 4 is an application device such as a video camera, a digital camera, or a music player that efficiently performs the recording / playback process by taking advantage of the advantages of the composite storage device 2. For example, the host device 4 may be identified device command ( ATA standard) is issued to the connected composite storage device 2 to obtain parameter information related to the composite storage device 2, and the composite storage device 2 is a composite type of the recording medium and the nonvolatile solid-state memory 26. It is a device that can easily recognize that it is a storage device. The host device 4 may be a device such as a personal computer that records and reproduces data according to a unique file system.

  As shown in FIG. 1, the composite storage device 2 includes a head unit 21 that writes data to the recording medium 20 and reads the written data, and a drive unit that drives the recording medium 20 in a predetermined direction at a predetermined rotation speed. 22, a servo control unit 23 that controls the head unit 21 and the drive unit 22, a read / write channel unit 24 that is connected to the head unit 21 and performs predetermined processing on supplied data, and temporarily A buffer memory 25 in which data is buffered, a non-volatile solid-state memory 26 in which data is stored, an HDD control unit 27 that controls the servo control unit 23 and the read / write channel unit 24, perform predetermined calculations, and perform servo control An arithmetic processing unit (CPU) 28 for setting and operating commands and parameters necessary for the unit 23 and the read / write channel unit 24, and the CPU 2 It comprises a memory 29 for use in calculation or the like, an interface controller 30 for transmitting and receiving such host equipment 4 and the data and control information, and a sensor 31 for detecting an environmental information by.

  Here, the relationship between the recording medium 20 and the nonvolatile solid-state memory 26 will be described with reference to FIG. FIG. 2 is a schematic diagram of an LBA (logical block address) space and a logical sector space.

  The recording medium 20 is managed by a FAT (File Allocation Table) file system, which will be described later, and comprises a data area DA1 to which addresses (hereinafter referred to as physical addresses) are assigned at least for each predetermined data size (cluster). It is composed of a disk-shaped recording medium such as an HD (hard disk).

  The nonvolatile solid-state memory 26 is a NAND-type FLASH memory card (Memory Stick, Compact Flash, SD Card, etc.) that employs a FAT file system, and is stored in the recording medium 20 for each predetermined data size (cluster). The data area DA2 includes a data area DA2 to which a series of addresses (hereinafter referred to as memory addresses) are attached from the head address of the data area DA1, and a system entry area SA in which system information is stored. The system entry area SA includes a boot data area BA in which boot information is stored, and an identification information table (FAT) in which predetermined identification information is written for each predetermined address (hereinafter referred to as a logical address). It comprises a FAT area FA that is stored and a directory area DirA that stores directory information.

  In the present invention, the data area DA1 of the recording medium 20 and the data area DA2 of the nonvolatile solid-state memory 26 are integrated by the FAT file system and managed as a data area (hereinafter referred to as an integrated data area DA).

  Here, the FAT file system will be described. The FAT is a table in which connection information of each cluster is recorded when a file is divided into a plurality of clusters and recorded. The format system manages the host device 4 using the table. It is a table that has been adopted. The format is an operation of partitioning a data storage area into areas of a predetermined size and assigning numbers (physical addresses), and dividing a track formed on the recording medium 20 into areas called sectors. This is completed by a so-called physical format and a so-called logical format in which a plurality of sectors are grouped into units called clusters to create a system entry area SA, a data area DA1, and a data area DA2.

  One sector is the minimum unit (usually 512 bytes) for recording data on the recording medium 20, and this is also the minimum unit in the present invention. The host device 4 accesses the recording medium 20 using a logical block address (LBA). Also, in the FAT file system for managing files, a plurality of sectors (N) are defined as one cluster, which is the minimum unit for reading and writing data.

  The system entry area SA generated by the format includes a boot data area BA, a FAT area FA in which FAT is written, and a directory area DirA. The boot data area BA is a sector of LBA “0000” as viewed from the host device 4, and a bootstrap code and a partition table are recorded therein.

  In the FAT, as shown in FIG. 3, predetermined information such as vacancy information in the data area is indicated by each identification information. For example, the identification information “0000h” indicates that the corresponding cluster is in a “vacant” state, and the identification information “0002h to FFF6h” indicates that the corresponding cluster is in an “allocated” state. In addition, the corresponding value indicates that the cluster number continues to the next, and the identification number “FFF7h” indicates that the corresponding cluster is “defective cluster”, and the identification number “ "FFF8h to FFFFh" indicates a file end (EOF, End Of File) in which the corresponding cluster is in an "allocated" state.

  The data area includes a directory area for managing file information and a data area in which actual data is written. As shown in FIG. 4, the directory area includes a file name, an extension, an attribute, a reserved area (RES), a recording time, a recording date, a start (start) cluster number (address), And file size (file length) information.

  In the present invention, when the power of the composite storage device 1 is turned on, the system entry area SA that is read first is not the recording medium 20 that takes a predetermined time until the data can be accessed after the power is turned on. Are provided in a nonvolatile solid-state memory 26 capable of accessing data. Therefore, the recording medium 20 has a data area DA1 to which a physical address is assigned for each predetermined data size, and the nonvolatile solid-state memory 26 is a data having a memory address for each predetermined data size. The area DA2 includes a system entry area SA including a FAT that is configured by a logical address associated with a physical address of the data area DA1 and a memory address of the data area DA2.

  Therefore, the host apparatus 4 is connected to the composite recording apparatus 1 and the system entry area SA can be read out immediately after the power is turned on.

  The servo control unit 23 controls the drive unit 22 so as to rotate the recording medium 20 in a predetermined direction at a predetermined speed, and also controls the driving of the head unit 21 to access a predetermined location on the recording medium 20. To do.

  The read / write channel unit 24 encodes (modulates) the supplied data and converts it into a digital bit sequence suitable for the characteristics of the recording / reproducing system, and then converts the converted data to the head unit 21. Supply. Further, the read / write channel section 24 removes high frequency noise from the reproduction signal supplied from the head section 21 during the data read operation, and then digitizes it by an analog-to-digital converter (ADC) to perform maximum likelihood decoding or the like. The signal is demodulated after a predetermined process is performed.

  In the buffer memory 25, data supplied from the host device 4 is temporarily buffered by the control of the HDD control unit 27 at the time of data writing, and the data is read when the data reaches a predetermined amount. The read data is supplied to the read / write channel section 24. Also, the buffer memory 25 temporarily stores data supplied from the read / write channel unit 24 under the control of the HDD control unit 27 when reading data, and when the data reaches a predetermined amount, Is read, and the read data is supplied to the host device 4 via the interface control unit 30. The buffer memory 25 is used for temporarily buffering data at the time of reading and writing data, and suppressing a decrease in performance due to a difference in transfer speed.

  The HDD control unit 27 manages transmission / reception of data between the buffer memory 25 and the read / write channel unit 23 by a FAT file system, which will be described later, and performs processing related to the data format. The HDD control unit 27 also performs processing related to encoding using an error correction code, error detection, and error correction when performing the processing.

  The sensor 31 includes a temperature sensor 31a that measures the internal temperature of the composite memory device 2, and an acceleration sensor 31b that detects an acceleration or a speed change applied to the composite memory device 2. The temperature sensor 31a generates a signal S1 indicating that the internal temperature is outside the predetermined range when the measured internal temperature falls below or exceeds the predetermined temperature range, and the generated signal is sent to the HDD control unit 27. To supply. When the signal S1 is supplied from the temperature sensor 31a while data is being written to the recording medium 20, the HDD control unit 27 stops the writing operation and stores the cluster data that has been written to the recording medium 20. Control is performed so as to write to the nonvolatile solid-state memory 26.

  Further, when the internal temperature returns to the predetermined range, the temperature sensor 31a generates a signal S2 for notifying that and supplies the generated signal S2 to the HDD control unit 27. When the signal S2 is supplied from the temperature sensor 31a, the HDD control unit 27 stops the writing operation to the nonvolatile solid-state memory 26, and the cluster data written to the nonvolatile solid-state memory 26 is stored in the recording medium 20. Control to write.

  The acceleration sensor 31b detects an acceleration or speed change applied to the composite memory device 2, calculates an impact degree from the detected acceleration or speed change, and if the calculated impact degree is out of a predetermined range, A signal S3 for notifying the fact is generated, and the generated signal S3 is supplied to the HDD control unit 27. If the signal S3 is supplied from the acceleration sensor 31b when data is being written to the recording medium 20, the HDD control unit 27 stops the writing operation and stores the cluster data that has been written to the recording medium 20. Control is performed so as to write to the nonvolatile solid-state memory 26.

  Further, when the degree of impact returns to a predetermined range, the acceleration sensor 31b generates a signal S4 for notifying that and supplies the generated signal S4 to the HDD control unit 27. When the signal S4 is supplied from the acceleration sensor 31b, the HDD control unit 27 stops the writing operation to the nonvolatile solid-state memory 26, and the cluster data written to the nonvolatile solid-state memory 26 is stored in the recording medium 20. Control to write.

  Further, the acceleration sensor 31b detects the acceleration and frequency applied to the composite memory device 2, calculates the vibration degree from the detected acceleration and frequency, and if the calculated vibration degree is outside the predetermined range, A signal S5 for notifying is generated, and the generated signal S5 is supplied to the HDD control unit 27. If the signal S5 is supplied from the acceleration sensor 31b when data is being written to the recording medium 20, the HDD control unit 27 stops the writing operation and stores the cluster data that has been written to the recording medium 20. Control is performed so as to write to the nonvolatile solid-state memory 26.

  Further, when the vibration level returns to the predetermined range, the acceleration sensor 31b generates a signal S6 for notifying the fact and supplies the generated signal S6 to the HDD control unit 27. When the signal S6 is supplied from the acceleration sensor 31b, the HDD control unit 27 stops the writing operation to the nonvolatile solid-state memory 26, and the cluster data written to the nonvolatile solid-state memory 26 is stored in the recording medium 20. Control to write.

  The sensor 31 may include a drop speed detection sensor that detects the drop speed of the composite memory device 2. When the composite storage device 2 detects a falling speed that is continuous for a predetermined time or more, the falling speed detection sensor generates a signal S7 that notifies that, and supplies the generated signal S7 to the HDD control unit 27. If the signal S7 is supplied from the drop speed detection sensor while data is being written to the recording medium 20, the HDD control unit 27 stops the writing operation and the cluster data that has been written to the recording medium 20 Is written to the nonvolatile solid-state memory 26.

  Here, a case where the host device 4 of the data access system 1 is a PC and the composite recording apparatus 2 is used as a device similar to a normal HDD will be described with reference to FIG. However, unlike the normal HDD, the composite storage device 2 includes a nonvolatile solid-state memory 26.

  After the host device 4 is activated by a predetermined procedure, information written in the directory area from the system entry area SA stored in the nonvolatile solid-state memory 26 of the composite storage device 1 (hereinafter referred to as directory information). ) And FAT, and the read directory information and FAT are expanded in the memory 11. The host device 4 maintains (updates or changes) the directory information and the FAT in the memory 11 each time a file is created, deleted, and modified, and at the same time, the maintained contents are stored in the nonvolatile memory of the composite storage device 1. Is reflected in the system entry area SA of the solid state memory 26.

  Next, when writing data into the integrated data area DA composed of the recording medium 20 and the nonvolatile solid-state memory 26 of the composite storage device 2, the host device 4 manages the directory information, and the FAT storage is managed by the composite storage device. The procedure for writing the data supplied from the host device 4 to the integrated data area DA when 1 is performed will be described with reference to the flowcharts of FIGS. 5A, 5B, and 5C.

  The nonvolatile solid-state memory 26 includes a system entry area SA including a FAT area FA in which FAT is stored and a directory area DirA in which directory information is stored, and the remaining area is the integrated data area DA. The data area DA2 is formed.

  In the present embodiment, the FAT is a logical address corresponding to the data area DA1 in order to integrally handle the integrated data area DA including the data area DA1 of the recording medium 20 and the data area DA2 of the nonvolatile solid-state memory 26. From 0000h to 7FFFh, on the other hand, 8000h to 8FFFh are added as logical addresses corresponding to the data area DA2 so as to be continuous with the data area DA1. Therefore, when data is written according to the FAT, data is written to the data area DA2 when all the data areas DA1 are “allocated”. As will be described later, the integrated data area DA composed of the data area DA1 of the recording medium 20 and the data area DA2 of the nonvolatile solid-state memory 26 has a part of the data area DA1 and a part of the data area DA2 from the viewpoint of LBA. It may be configured to be handled redundantly.

Also, if the capacity of one sector formed by the format is 512 bytes and one cluster is composed of 64 sectors, the capacity of one cluster is
64 × 512B ≒ 32KB
Since the data capacity of the data area DA2 of the recording medium 20 corresponds to 32767 (7FFF) clusters,
32KB × 32767 ≒ 1GB
It becomes. Moreover, since the capacity of the data area DA2 of the nonvolatile solid-state memory 26 corresponds to 4096 clusters,
32KB × 4096 ≒ 128MB
It becomes.

  Further, as shown in FIG. 6, when the data access system 1 is activated, the data access system 1 reads directory information from the directory area DirA of the nonvolatile solid-state memory 26, and expands the read directory information in the memory 11 of the host device 4. Further, the FAT is read from the FAT area FA, and the read FAT is developed in the memory 29. By doing so, the host device 4 has a directory determination right, while the composite storage device 2 has a FAT determination right. Accordingly, the composite storage device 2 itself determines available free areas (empty clusters) of the integrated data area DA, and determines the FAT chain (concatenation information of clusters constituting one file) by itself. To do. On the other hand, the host device 4 only designates the start point (first cluster number) of the FAT chain, and designates the free cluster thereafter by the composite storage device 2 itself.

  In step ST1, the HDD control unit 27 determines whether the sensor 31 has detected an abnormality as shown in FIG. 5A. As described above, when the abnormality is detected, the sensor 31 generates the signal S1, the signal S3, the signal S5, or the signal S7 and supplies the signal S1 to the HDD control unit 27. If the sensor 31 has not detected an abnormality, that is, if it is normal, the process proceeds to step ST2, and if the sensor 31 has detected an abnormality, the process proceeds to step ST11 (see FIG. 5C).

  In step ST2, the HDD control unit 27 determines whether the state of the recording medium 20 is active, that is, whether data can be written. In this step, for example, the determination is made based on whether or not the rotational speed of the disk built in the recording medium 20 has reached a predetermined rotational speed. If the recording medium 20 is in the active state, the process proceeds to step ST3 (see FIG. 5B). If not, the process proceeds to step ST19.

  In step ST3, the HDD control unit 27 searches for an empty cluster from the data area DA1 of the recording medium 20. Since the recording medium 20 is active, the HDD control unit 27 searches for an empty cluster from the data area DA1 corresponding to the recording medium 20 in the integrated data area DA.

  In step ST4, the HDD control unit 27 determines whether the data to be recorded in the free cluster detected in the process of step ST3 is the first data, that is, whether the data is the first cluster. If it is the first cluster, the process proceeds to step ST6, and if it is not the first cluster, the process proceeds to step ST5.

  In step ST5, the HDD control unit 27 performs a process for connecting the FAT chain to a free cluster to which data is to be written. In the FAT developed in the memory 29, the HDD control unit 27 changes the cluster address “0000h” searched in step ST3 to the address of the cluster to be written, and updates the FAT chain.

  On the other hand, in step ST6, the HDD control unit 27 sets the free cluster to which data is to be written to “allocated”. The HDD control unit 27 writes information indicating allocation to an address of a free cluster to be written on the FAT developed in the memory 29 (FIG. 3).

  In step ST7, the HDD control unit 27 writes data in the data area DA1 corresponding to the free cluster detected in the process of step ST3.

  In step ST8, the HDD control unit 27 determines whether the sensor 31 has detected an abnormality. When the sensor 31 does not detect an abnormality, that is, when it is normal, the process proceeds to step ST17, and when the sensor 31 detects an abnormality, the process proceeds to step ST9.

  In step ST9, the HDD control unit 27 deletes the FAT chain updated in the process of step ST5 or step ST6, searches for a free cluster in the data area DA2, and reconnects the FAT chain.

  In step ST10, the HDD control unit 27 writes data in the data area DA2 corresponding to the free cluster detected in the process of step ST9. Thereafter, the process proceeds to step ST24.

  Here, the process of step ST9 thru | or step ST10 and its related matter are explained in full detail.

<Specific example 1>
The composite memory device 2 is configured to measure the temperature inside the composite memory device 2 using a temperature sensor 31a. An element such as a thermocouple or a thermistor is used as the temperature sensor 31a. Based on the signal supplied from the temperature sensor 31a, the HDD control unit 27 determines whether the internal temperature exceeds the upper and lower limits of the guaranteed operating temperature of the recording medium 20, and continues writing data on the recording medium 20. Alternatively, it is determined whether to switch the writing target from the recording medium 20 to the nonvolatile solid-state memory 26. Here, the operation guaranteed temperature of the recording medium 20 will be described with reference to FIG.

  FIG. 7 is a diagram showing the temperature dependence of the recording medium 20 obtained by actual measurement. From FIG. 7, the operation guaranteed range of the recording medium 20 is around 5 ° C. to 50 ° C. The triangular plot is actually measured data, and the curve is an approximate line of the actually measured data. The horizontal axis indicates the temperature (° C.), and the vertical axis indicates the data transfer rate (Mbit / s) when data is continuously written in a continuous area, that is, sequential write. A shaded area (0 ° C. or lower and 70 ° C. or higher) indicates a temperature range in which the operation of the nonvolatile solid-state memory 26 is not guaranteed.

  The composite storage device 2 appropriately uses the recording medium 20 and the nonvolatile solid-state memory 26 as appropriate based on the data shown in FIG. 7, so that the guaranteed temperature range of the data writing operation is 0 ° C. to 70 ° C. as a whole. can do.

  Accordingly, the temperature sensor 31a generates a signal S1 for notifying abnormality when the internal temperature becomes 0 ° C. or lower or 70 ° C. or higher, and transmits the signal S1 to the HDD control unit 27, while the internal temperature When the temperature returns to 0 ° C. to 70 ° C., a signal S 2 notifying normality is generated, and the signal S 2 is transmitted to the HDD control unit 27.

  For example, when the writing of the first cluster data and the second cluster data of File 1 is finished in “1234h” and “1235h” of the data area DA1, and the third cluster data of File 1 is written in “1236h”. (FIG. 8) When the internal temperature reaches around 70 ° C., the HDD control unit 27 transmits a signal S1 from the temperature sensor 31a. The HDD control unit 27 considers that an abnormality has occurred in the recording medium 20 before returning the “write end” command to the host device 4 when the transfer of the third cluster data is completed, and operates the recording medium 20. To stop. Then, the HDD control unit 27 determines that the data (third cluster data) written to the recording medium 20 has not been correctly written, deletes the cluster designation at the end of the FAT chain, and stores the nonvolatile solid-state memory 26. The upper empty cluster is searched, the FAT chain is updated based on the searched empty cluster address “8765h”, and the data (third cluster data) is rewritten in “8765h” of the data area DA2. Then, the HDD control unit 27 notifies the host device 4 of a “write end” command after the rewrite is completed.

  Further, FIG. 9 shows the final case where all the data after the third cluster data of File 1 is written to the data area DA2 after the temperature sensor 31a exceeds the upper limit temperature (around 70 ° C.) of the operation guarantee range. A typical storage area configuration is shown. Note that FIG. 9 shows that the data of File 1 is connected by the FAT chain “1234h → 1235h → 8765h → 8766h... 8770h (EOF)”.

  Further, in FIG. 10, the writing of the first cluster data and the second cluster data of File 1 to “1234h” and “1235h” of the data area DA1 is completed, and the third cluster data of File 1 is stored in “1236h”. When writing, the internal temperature exceeds the upper limit temperature (about 70 ° C.) of the operation guarantee range, and the third cluster data and the fourth cluster data of File1 are stored in “8765h” and “8766h” of the data area DA2. The configuration state of the integrated data area DA when the internal temperature returns to the operation guarantee range (0 ° C. to 70 ° C.) when the writing and subsequent fifth cluster data is written to “8767h” is shown. Here, the operation of the HDD control unit 27 in the case shown in FIG. 10 will be described.

  When the HDD controller 27 receives the signal S2 indicating that the internal temperature has returned to the guaranteed operating range from the temperature sensor 31a while writing the fifth cluster data to “8767h”, the HDD controller 27 starts the recording medium 20 Execute the process. The HDD control unit 27 continues to write data in the data area DA2 until the recording medium 20 is completely activated and becomes active. Therefore, in this embodiment, the HDD control unit 27 controls to write the fifth cluster data and the sixth cluster data in “8767h” and “8768h” of the data area DA2, and the recording medium 20 is completely started up. After confirming this, the writing operation to the data area DA2 is stopped, and control is performed so that the seventh cluster data and subsequent data are written to the data area DA1 (FIG. 11).

  FIG. 11 shows that the data of File 1 is connected by the FAT chain “1234h → 1235h → 8765h → 8766h → 8767h → 8768h → 1236h → 1237h → 1238h... 123Ch (EOF)”.

  In the above description, the case where the internal temperature exceeds the upper limit temperature of the operation guarantee range has been described. However, the same processing is performed when the internal temperature falls below the lower limit temperature (near 0 ° C.) of the operation guarantee range. Can be done.

<Specific example 2>
In addition, the composite memory device 2 is configured to measure vibration applied (applied) to the composite memory device 2 itself by the acceleration sensor 31b. Further, as the acceleration sensor 31b, an element capable of measuring in each direction of a one-dimensional direction, a two-dimensional direction, or a three-dimensional direction can be appropriately selected. Further, the acceleration sensor 31b can obtain (calculate) the frequency and intensity of vibration from the input vibration period and intensity, and determines whether or not the value deviates from the allowable range of the recording medium 20. Then, it is determined whether to continue writing data on the recording medium 20 or to switch the writing target from the recording medium 20 to the nonvolatile solid-state memory 26. Here, an allowable range of the operation vibration of the recording medium 20 will be described with reference to FIG.

  FIG. 12 is a diagram showing the vibration dependence of the recording medium 20 obtained by actual measurement. From FIG. 12, the allowable range of the operation vibration of the recording medium 20 is 0G to 2G. The triangular plot is actually measured data, and the curve is an approximate line of the actually measured data. The horizontal axis represents the vibration intensity (G), and the vertical axis represents the data transfer rate (Mbit / s) when data is continuously written in a continuous area, that is, sequential write. A shaded area (15G or more) indicates a vibration range where the operation of the nonvolatile solid-state memory 26 is not guaranteed.

  Based on FIG. 12, the composite storage device 2 can appropriately set the guaranteed vibration range of the data write operation to 0G to 15G by properly using the recording medium 20 and the nonvolatile solid-state memory 26 as appropriate. Further, there is no lower limit for vibration, and the same processing as in the case of the temperature described above can be performed except that the determination is made only by the upper limit.

  Therefore, when the internal vibration becomes 15G or more, the acceleration sensor 31b generates a signal S3 for notifying abnormality and transmits the signal S3 to the HDD control unit 27, while the internal vibration becomes 15G or less. When returning, a signal S4 notifying normality is generated, and the signal S4 is transmitted to the HDD control unit 27.

  In general, in the recording medium 20, the vibration intensity in the frequency band of about 10 Hz to about 150 Hz is defined as the operation vibration guaranteed range. This band is a region where the frequency is sufficiently lower than the servo band of about 500 Hz to about 1,500 Hz and the servo gain is sufficient. It is considered that error compression by the servo cannot be expected in the vicinity of the servo band or in a frequency band higher than that, and the vibration is transmitted to the head unit 21 as it is. Such high-frequency vibration is given to the device by sound (air vibration) or the like. Even for such a relatively high frequency vibration, it is possible to select a data area by making use of the characteristics of the composite memory device 2.

<Specific example 3>
The composite memory device 2 is configured to measure the impact strength applied (applied) to the composite memory device 2 itself by the acceleration sensor 31b. Further, as the acceleration sensor 31b, an element capable of measuring in each direction of a one-dimensional direction, a two-dimensional direction, or a three-dimensional direction can be appropriately selected. Further, unlike vibration and temperature, the impact is not a steady state but a discrete and transient phenomenon. The conventional recording medium 20 has a mechanism for protecting the disk by retracting the head unit 21 from the recording medium 20 when an acceleration greater than a certain acceleration is detected when an acceleration sensor is provided inside. Exists. In addition, when the servo lock or PLL lock is monitored and they show an abnormality, the head unit 21 is retracted from the recording medium 20 on the assumption that an abnormal phenomenon (the cause is not specified) such as an impact is applied to the recording medium 20 Some have a mechanism to do this. The present invention is also effective for the recording medium 20 in which the mechanism for retracting the head portion 21 from the recording medium 20 as described above is incorporated, and while the head portion 21 is retracted from the recording medium 20. When the data is written to the nonvolatile fixed memory 26 and there is no continuous impact, the recording medium 20 is started again and recording on the recording medium 20 is performed.

  Here, an allowable range for the impact of the recording medium 20 will be described with reference to FIG. FIG. 13 is a diagram showing the impact dependency of the recording medium 20 obtained by actual measurement. From FIG. 13, the allowable range of impact of the recording medium 20 is 3.1 m / s (for example, at 500 G, 1 ms-falf-sine) in terms of speed change. The triangular plot is actually measured data, and the curve is an approximate line of the actually measured data. The horizontal axis represents the speed change (m / s), and the vertical axis represents the data transfer rate (Mbit / s) when data is continuously written in a continuous area, that is, sequential write. A shaded region (18.7 m / s or more) indicates an impact range where the operation of the nonvolatile solid-state memory 26 is not guaranteed.

  Based on FIG. 13, the composite storage device 2 properly uses the recording medium 20 and the nonvolatile solid-state memory 26 as appropriate so that the guaranteed impact range of the data writing operation can be changed to 18.7 m / s (speed change) as a whole. For example, it can be 3000G, 1ms-half-sine).

The acceleration intensity is often expressed by G (9.8 m / s ² ) or the like. However, the acceleration waveform may be integrated on the time axis, and a speed change (m / s) taking into account the acceleration duration may be used. . The same process can be used when this speed change is used as an index. The impact of a 10 msec half-sine at 100 G is expressed by the following equation when converted to a speed change.
Speed change = 100 × 9.8 (m / s ² ) × 10 e ⁻³ (sec) × 2 / 3.14159 = 6.2 (m / s).

<Specific Example 4>
The composite memory device 2 is configured to measure the impact strength applied (applied) to the composite memory device 2 itself by the acceleration sensor 31b. As the acceleration sensor 31b, an element capable of measuring in a one-dimensional direction, a two-dimensional direction, or a three-dimensional direction can be selected as appropriate. Further, when the object is allowed to fall freely from the stationary state according to gravity, acceleration of 1 G (9.8 m / s ² ) is continuously generated in the object. Further, when the falling direction is not constant, it is difficult to measure a constant acceleration with the acceleration sensor 31b that can only measure in a one-dimensional direction. In particular, in a free fall while rotating, it is necessary to evaluate with the intensity of a three-dimensional vector by the acceleration sensor 31b capable of measuring in a three-dimensional direction. Therefore, an element capable of measuring in the three-dimensional direction should be selected as the acceleration sensor 31b.

  When the acceleration sensor 31b determines that the acceleration is continuously generated in the vicinity of 1G (9.8m / s2) for a predetermined time, the acceleration sensor 31b generates a signal S7 for notifying the fact, and the generated signal S7 is HDD-controlled. To the unit 27. Therefore, the composite storage device 2 can protect the recording medium 20 before colliding with the ground, and can be retracted before the head unit 21 collides with the recording medium 20.

  In step ST11, the HDD control unit 27 determines whether the recording medium 20 is active, that is, whether data can be written. In this step, for example, the determination is made based on whether or not the rotational speed of the disk built in the recording medium 20 has reached a predetermined rotational speed. If the state of the recording medium 20 is active and starting, the process proceeds to step ST12. If the recording medium 20 is in the stop or stop process, the process proceeds to step ST13.

  In step ST12, the HDD control unit 27 generates a signal (status) for stopping the recording medium 20, and transmits the generated signal to the recording medium 20. When the recording medium 20 receives a signal prompting the stop from the HDD control unit 27, the recording medium 20 stops the rotation of the built-in disk.

  In step ST13, the HDD control unit 27 searches for an empty cluster from the data area DA2 corresponding to the nonvolatile solid-state memory 26 in the integrated data area DA.

  In step ST14, the HDD control unit 27 determines whether the data to be recorded in the free cluster detected in the process of step ST13 is the first data, that is, whether it is the first cluster. If it is the first cluster, the process proceeds to step ST16, and if it is not the first cluster, the process proceeds to step ST15.

  In step ST15, the HDD control unit 27 performs a process for connecting the FAT chain to an empty cluster to which data is to be written. In the FAT developed in the memory 29, the HDD control unit 27 changes the address “0000h” of the cluster searched in step ST13 to the address of the free cluster to be written, and updates the FAT chain.

  On the other hand, in step ST16, the HDD control unit 27 sets the free cluster to which data is to be written to “allocated”. The HDD control unit 27 writes information indicating allocation to the address of the free cluster to be written on the FAT developed in the memory 29 (FIG. 4).

  In step ST17, the HDD control unit 27 writes data in the data area DA2 corresponding to the free cluster detected in the process of step ST19. Thereafter, the process proceeds to step ST24.

  In step ST18, the HDD control unit 27 generates a predetermined signal (status) for starting the recording medium 20, and transmits the generated signal to the recording medium 20. When the recording medium 20 receives a signal for prompting activation from the HDD control unit 27, the recording medium 20 is rotated so that the built-in disk can perform data recording (active).

  In step ST19, the HDD control unit 27 searches for an empty cluster from the data area DA2 of the nonvolatile solid-state memory 26. Since the recording medium 20 is not yet active, the HDD control unit 27 searches for an empty cluster from the data area DA2 corresponding to the nonvolatile solid-state memory 26 in the integrated data area DA.

  In step ST20, the HDD control unit 27 determines whether the data to be recorded in the free cluster detected in the process of step ST19 is the first data, that is, whether it is the first cluster. When it becomes the first cluster, the process proceeds to step ST22, and when it does not become the first cluster, the process proceeds to step ST21.

  In step ST <b> 21, the HDD control unit 27 performs processing for connecting the FAT chain to a free cluster to which data is to be written. In the FAT developed in the memory 29, the HDD control unit 27 changes the address “0000h” of the cluster searched in the step ST19 to the address of the free cluster to be written, and updates the FAT chain.

  On the other hand, in step ST22, the HDD control unit 27 sets a free cluster to which data is to be written to “allocated”. The HDD control unit 27 writes information indicating allocation to the address of the free cluster to be written on the FAT developed in the memory 29 (FIG. 4).

  In step ST23, the HDD control unit 27 writes data in the data area DA2 corresponding to the free cluster detected in the process of step ST19.

  In step ST24, the HDD control unit 27 determines whether the data written in the integrated data area DA by the process of step ST10, the process of step ST17, and the process of step ST23 is the last cluster, that is, the last data constituting one file. Judging. If it is the final cluster, the process proceeds to step ST25, and if it is not the final cluster, the process proceeds to step ST26.

  In step ST25, the HDD control unit 27 performs a process for terminating the FAT chain with the EOF of the data. The HDD control unit 27 changes the information indicating EOF at the address corresponding to the final cluster in the FAT developed in the memory 29, and updates the FAT chain.

  In step ST26, the HDD control unit 27 checks whether or not there is a free area in the data area DA2 corresponding to the nonvolatile solid-state memory 26 in the integrated data area DA. The HDD control unit 27 refers to the FAT developed in the memory 29 to check whether there is a free area in the data area DA2. If there is no empty area in the data area DA2, the process proceeds to step ST27. If there is an empty area in the data area DA2, the process returns to step ST1.

  In step ST27, the HDD control unit 27 generates a signal (status) indicating that there is no empty area in the data area DA2, and transmits the generated signal to the host device 4. Thereafter, the process returns to step ST1. The HDD control unit 27 determines whether or not the remaining amount of the data area DA2 has reached a predetermined value, and generates a status when it has reached the predetermined value.

  The data access system 1 configured as described above includes a nonvolatile solid-state memory 26 and a recording medium 20, and a composite storage device 2 in which data areas are integrated by a predetermined file system, and a composite storage device 2 On the other hand, it is composed of a host device 4 that writes and reads data, and the temperature inside the composite storage device 2 is recorded by a sensor 31 (temperature sensor 31a) built in the composite storage device 2. Whether the upper limit or lower limit of the operation guarantee temperature of the medium 20 is exceeded is detected, and the data write destination is set to the recording medium 20 (data area DA1) or the nonvolatile solid-state memory 26 (data area DA2) according to the detection. Therefore, within the guaranteed temperature range of data writing operation (around 0 ° C to 70 ° C), data writing is ensured without interruption. It can be carried out only.

  Further, the data access system 1 measures the vibration applied (applied) to the composite storage device 2 itself by the sensor 31 (acceleration sensor 31b) built in the composite storage device 2, and the allowable range of the recording medium 20 And the data write destination is determined in the recording medium 20 (data area DA1) or the nonvolatile solid-state memory 26 (data area DA2) in accordance with the detection, so that the guaranteed vibration range of the data write operation is determined. Within (0G to 15G), data can be reliably written without interruption.

  Further, the data access system 1 measures the impact strength applied (applied) to the composite storage device 2 itself by the sensor 31 (acceleration sensor 31b) built in the composite storage device 2, and the impact of the recording medium 20 is measured. And the data write destination is determined in the recording medium 20 (data area DA1) or the nonvolatile solid-state memory 26 (data area DA2) in accordance with the determination. Within the guaranteed impact range (18.7 m / s (for example, at 3000 G, 1 ms-half-sine)), data can be reliably written without interruption.

  Further, the data access system 1 measures the impact strength applied (applied) to the composite memory device 2 itself, and detects whether or not the acceleration is continuously generated in the vicinity of 1 G (9.8 m / s2) for a predetermined time. Since the predetermined signal S7 is transmitted to the HDD control unit 27 in response to the detection, for example, the head unit 21 is retracted from the recording medium 20 before the apparatus collides with the ground due to free fall. Protection can be achieved.

  The sensor 31 may be configured to include either the temperature sensor 31a or the acceleration sensor 31b.

  As described above, the host device 4 accesses the composite storage device 1 using the logical block address (LBA) instead of the logical sector number (LSN). In the present invention, as shown in the conceptual diagram of FIG. 14, a region X in which LBA is overlapped with a part of the recording medium 20 and a part of the nonvolatile solid-state memory 26 is formed. May be. In FIG. 14, the same LBA is attached to a part of the data area DA1 and a part of the data area DA2, and the region X is formed. However, the present invention is not limited to this.

  For example, the HDD control unit 27 performs processing so that information written in the FAT area and the directory area and important data are recorded in the area X.

  Thus, in the composite storage device 1 according to the present invention, for example, when the region X is formed, the FAT or the like is recorded on both the recording medium 20 and the nonvolatile solid-state memory 26, which is strong. It is possible to construct a simple system.

  Further, in the present embodiment, the description has been made assuming that the recording medium 20 is a hard disk. However, since processing similar to that of the present invention is possible if the storage medium is randomly accessible, an optical disk such as a CD or DVD is used. There may be.

  Further, although the FAT file system is used as a file system for managing the data area of the composite storage medium 2, any system may be applied as long as the system manages data as a file.

  In the present invention, the series of processing by the composite storage device 2 described above can also be performed by software. When a series of processing is performed by software, a program constituting the software is installed in a general-purpose computer or the like. The program may be recorded on a removable medium such as a CD-ROM and distributed to the user, or may be distributed by being downloaded to the user's computer via a network.

It is a block diagram which shows the structure of the data access system which concerns on this invention. FIG. 3 is a schematic diagram of an LBA space and a logical sector space when a recording medium and a nonvolatile solid-state memory provided in a composite storage device are managed in a predetermined file format. It is a figure which shows the meaning of each identification information. It is a figure which shows the structure of a directory area. 5 is a first flowchart for explaining a procedure for writing data to a composite storage device in the data access system. FIG. 10 is a second flowchart illustrating a procedure for writing data to the composite storage device in the data access system. FIG. 12 is a third flowchart for explaining a procedure for writing data to the composite memory device in the data access system. FIG. 4 is a diagram for explaining that directory information stored in a directory area is managed by a host device and that a FAT of a file system is managed by a composite storage device. It is a figure where it uses for description about the temperature dependence of a composite memory | storage device. FIG. 6 is a diagram for explaining a case where an abnormality is detected by a temperature sensor while data is being written to a data area of a recording medium. It is a figure which uses for description about the case where all the remaining data are written in the data area of a non-volatile solid-state memory after the internal temperature of a recording medium exceeds the upper limit temperature of an operation | movement guarantee range. FIG. 5 is a first diagram for explaining a data writing operation when the internal temperature of the recording medium exceeds the upper limit temperature of the operation guarantee range and then returns to the operation guarantee range again. FIG. 10 is a second diagram for explaining the data writing operation when the internal temperature of the recording medium exceeds the upper limit temperature of the operation guarantee range and then returns to the operation guarantee range again. It is a figure with which it uses for description about the operation | movement vibration dependence of a composite memory | storage device. It is a figure where it uses for description about the operation | movement impact dependence of a composite memory | storage device. It is a figure which shows a mode that the area | region X to which LBA is attached | subjected overlappingly in the one part area | region of a recording medium and the one part area | region of a non-volatile storage medium is formed.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Data access system, 2 Compound storage device, 3 Interface part, 4 Host apparatus, 10 CPU, 11 Memory, 12, 30 Interface control part, 20 Recording medium, 21 Head part, 22 Drive part, 23 Servo control part, 24 Read / write channel section, 25 buffer memory, 26 nonvolatile solid-state memory, 27 HDD control section, 28 arithmetic processing section (CPU), 29 memory, 31 sensor, 31a temperature sensor, 31b acceleration sensor

Claims (7)

A recording medium having a first data area in which a first address is assigned to each cluster of a predetermined size;
A second data area with a second address assigned to each cluster of a predetermined size, a first address assigned to the first data area, and a second address assigned to the second data area. 2 and a part of the second address are composed of the same logical address, and predetermined identification information is provided for each logical address. A non-volatile storage medium having a written identification information table ;
An interface unit to which the host device is connected;
When data supplied from the host device via the interface unit is written to the recording medium or the nonvolatile storage medium, a free cluster is searched based on the identification information table and corresponds to the searched free cluster. A writing unit for writing data to the recording medium or / and the non-volatile storage medium;
A sensor for detecting environmental information;
Based on the environmental information detected by the sensor, the write destination of the data supplied from the host device via the interface unit is changed from the recording medium to the nonvolatile storage medium, or from the nonvolatile storage medium to the recording medium. And a control unit for controlling the writing unit to change to
The sensor includes a temperature sensor that measures an internal temperature of the composite memory device, and an acceleration sensor that detects an acceleration or a speed change applied to the composite memory device in each of three-dimensional directions. A first signal indicating that the internal temperature of the composite memory device detected by the control unit is out of a predetermined range is generated and supplied to the control unit, and the composite memory device detected by the acceleration sensor Generating a second signal indicating that the acceleration or speed change applied to is out of a predetermined range, and supplying the second signal to the control unit;
When the first signal or the second signal is supplied from the sensor when the control unit writes data supplied via the interface unit by the writing unit to the recording medium, A composite storage device, wherein the writing unit is controlled to stop writing to the recording medium and to write the cluster data written to the recording medium to the nonvolatile storage medium . The sensor generates a third signal indicating that the internal temperature of the composite memory device detected by the temperature sensor has returned to a predetermined range, supplies the third signal to the control unit, and also detects the acceleration sensor. A fourth signal indicating that the acceleration or speed change applied to the composite storage device has returned within a predetermined range is supplied to the control unit,
When the third signal or the fourth signal is supplied from the sensor, the control unit stops writing to the non-volatile storage medium, and the cluster data written to the non-volatile storage medium is 2. The composite storage device according to claim 1, wherein the writing unit is controlled to write to a recording medium . The sensor detects an impact degree from a change in acceleration or speed applied to the composite storage device detected by the acceleration sensor, and generates the second signal and the fourth signal for the detected impact degree. 3. The composite memory device according to claim 2, wherein The sensor detects a vibration level from an acceleration and a frequency applied to the composite storage device detected by the acceleration sensor, and generates the second signal and the fourth signal for the detected impact level. The composite memory device according to claim 2 . If the sensor detects the falling speed of the composite memory device from the acceleration or speed change applied to the composite memory device detected by the acceleration sensor, and detects a continuous falling speed for a predetermined time or more, it indicates that. 2. The composite storage device according to claim 1, wherein a second signal to be notified is generated . A recording medium having a first data area to which a first address is assigned for each cluster of a predetermined size; a second data area to which a second address is assigned to each cluster of a predetermined size; A first address assigned to one data area and a logical address for managing a second address assigned to the second data area, a part of the first address and the second address A non-volatile storage medium having an identification information table in which a part of the addresses are configured by the same logical address and predetermined identification information is written for each logical address, and an interface unit to which a host device is connected In a data writing method for writing data to a composite storage device having:
When data supplied from the host device via the interface unit is written to the recording medium or the nonvolatile storage medium, a free cluster is searched based on the identification information table and corresponds to the searched free cluster. A writing step of writing data to the recording medium or / and the nonvolatile storage medium;
Environmental information is detected by a sensor composed of a temperature sensor that measures the internal temperature of the composite storage device and an acceleration sensor that detects an acceleration or speed change applied to the composite storage device in each of three-dimensional directions. Having a detection step to
In the detection step, a first signal indicating that the internal temperature of the composite memory device detected by the temperature sensor is out of a predetermined range is generated, and the composite memory detected by the acceleration sensor is used. A second signal indicating that the acceleration or speed change applied to the device is out of the predetermined range is generated, and the internal temperature of the composite memory device detected by the temperature sensor is returned to the predetermined range. And a fourth signal indicating that the acceleration or speed change applied to the composite storage device detected by the acceleration sensor has returned to a predetermined range.
When writing the data supplied via the interface unit to the recording medium, if the sensor generates the first signal or the second signal, the writing to the recording medium is stopped, The cluster data written to the recording medium is written to the non-volatile storage medium, and when the third signal or the fourth signal is generated by the sensor, the writing to the non-volatile storage medium is stopped. And writing the cluster data written in the non-volatile storage medium into the recording medium . A recording medium having a first data area to which a first address is assigned for each cluster of a predetermined size; a second data area to which a second address is assigned to each cluster of a predetermined size; A first address assigned to one data area and a logical address for managing a second address assigned to the second data area, a part of the first address and the second address A non-volatile storage medium having an identification information table in which a part of the addresses are configured by the same logical address and predetermined identification information is written for each logical address, and an interface unit to which a host device is connected A program for causing a computer to execute a process of writing data to a composite storage device having:
When data supplied from the host device via the interface unit is written to the recording medium or the nonvolatile storage medium, a free cluster is searched based on the identification information table and corresponds to the searched free cluster. A writing step of writing data to the recording medium or / and the nonvolatile storage medium;
Environmental information is detected by a sensor composed of a temperature sensor that measures the internal temperature of the composite storage device and an acceleration sensor that detects an acceleration or speed change applied to the composite storage device in each of three-dimensional directions. Having a detection step to
In the detection step, a first signal indicating that the internal temperature of the composite memory device detected by the temperature sensor is out of a predetermined range is generated, and the composite memory detected by the acceleration sensor is used. A second signal indicating that the acceleration or speed change applied to the device is out of the predetermined range is generated, and the internal temperature of the composite memory device detected by the temperature sensor is returned to the predetermined range. And a fourth signal indicating that the acceleration or speed change applied to the composite storage device detected by the acceleration sensor has returned to a predetermined range.
When writing the data supplied via the interface unit to the recording medium, if the sensor generates the first signal or the second signal, the writing to the recording medium is stopped, The cluster data written to the recording medium is written to the non-volatile storage medium, and when the third signal or the fourth signal is generated by the sensor, the writing to the non-volatile storage medium is stopped. And a program for causing the computer to execute a process of writing the cluster data written in the non-volatile storage medium to the recording medium .

Images