JP2006313514A - Composite storage device, access method and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the continuous transfer speed of data while adopting control by skew by efficiently using a nonvolatile solid memory in an HDD. <P>SOLUTION: This composite storage device 2 is provided with a recording medium 20 in which a plurality of recording tracks are formed concentrically from the central part to the outer peripheral side, a nonvolatile storage medium 26 having a data area constituted of a plurality of areas in predetermined sizes and a management information area in which predetermined management information is stored, an assignment part 27 for, when write destination is moved from one recording track to another recording track in the recording medium 20, assigning logical sector numbers to each sector of the recording medium 20 and each area of the nonvolatile storage medium 26 so that data can be written in the data area during movement, and that the data can be written in the other recording track in the completion of movement and an access part for making access to the recording medium 20 or the nonvolatile storage medium 26 based on the logical sector number assigned by the assignment part 27. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a composite storage device that includes a recording medium and a non-volatile storage medium and to which data is accessed based on a common file system, and an access method and program for accessing the composite storage device.

  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 are becoming 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, the nonvolatile semiconductor memory represented by the flash memory has advantages such as low power consumption, high-speed startup, and impact resistance, and is used for various applications depending on applications. The price is expensive.

  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.

  In addition, the HDD is superior to the nonvolatile semiconductor memory in terms of low cost and large capacity, but it takes 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).

JP 2003-123379 A JP 2003-125358 A JP 2002-150699 A JP 2000-324435 A JP 2003-317413 A

  By the way, in the HDD, the recording tracks are arranged concentrically from the center of the disk toward the outer periphery, and are separated for each recording track, so even when one recording track is continuously accessed, It is necessary to perform a seek operation for moving to another recording track. In an optical disk such as a CD, the track is formed in a spiral shape from the center toward the outer periphery, so that a seek operation as seen in an HDD does not occur when accessing sequentially.

  A recording track usually has a minimum unit of data access called a sector, and is managed using a physical address inside the HDD, while managed using a logical address (LBA (Logical Block Address)) from the outside of the HDD. Has been.

  Since continuous access from the outside of the HDD is performed using a logical address, if a logical address is not assigned to each sector in consideration of the time for the seek operation, access must be performed when the seek operation is completed. Sectors that cannot be passed will pass, causing rotation waiting, and the performance of the HDD will be significantly reduced.

  For this reason, the HDD employs a disk recording method called a track skew method. Specifically, as shown in FIG. 8, a logical address is assigned to each sector of recording track 1 to recording track 3 in consideration of the time required for the seek operation. In this example, the track skew is a rotation time for two sectors, and a logical address is assigned so as to be shifted by two sectors in the clockwise direction every time the track skew moves. Each recording track is composed of 16 sectors of a predetermined size. Note that the numbers of the respective recording tracks in FIG. 8 indicate logical addresses.

  Further, the logical addresses to be assigned will be described in detail. In the HDD, a unique physical sector number (PSN (Physical Sector Number)) is assigned as a physical address to all sectors included in each recording track. In consideration of track skew, a logical sector number (LSN (Logical Sector Number)) is assigned to each sector. Since the head accesses each sector according to the logical sector number, the sector corresponding to the end of one recording track (for example, the logical sector number is “15”) to the sector corresponding to the beginning of another recording track (for example, , The logical sector number is “16”) after the seek operation by the track jump is completed. A logical sector number is not assigned to a sector in which a primary defect has occurred.

  Also, logical addresses used for access from devices outside the HDD are assigned so that useless waiting time does not occur when consecutive accesses are made using logical sector numbers and other physical addresses (head, track numbers). . The track skew is similarly set when the head moves (head change) from one disk built in the HDD to another disk or from one side of the one disk to the other side.

  Therefore, in order to improve the performance of continuous access to the sector, it is sufficient to reduce the skew or eliminate the skew.

  However, in order to reduce the skew, it is necessary to shorten the time required for the seek operation. In addition, in order to reduce the time required for the seek operation, it is necessary to use a high-performance actuator such as a two-stage actuator using a piezoelectric element or a micromachine, for example, in order to find the speed of the seek operation. End up. In addition, as the seek operation speeds up, suspension vibrations and the like are excited, and there are side effects such as affecting the flying height of the head.

  Here, for example, a method for designing an actuator has been proposed in order to solve the above-described problems (see Patent Document 5). However, the methods described in the literature require complicated calculations and highly accurate position signals, resulting in expensive equipment.

  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, there is provided a composite storage device capable of efficiently using a nonvolatile solid-state memory in the HDD and improving the continuous data transfer speed while adopting control by skew, and the composite storage An object is to provide an access method and program for accessing a device.

  In order to solve the above-described problem, a composite storage device according to the present invention forms an annular recording track including a plurality of sectors of a predetermined size, and the recording track is concentric from the center to the outer peripheral side. Are formed, and each sector is assigned a unique physical sector number, a data area consisting of a plurality of areas of a predetermined size, and recording tracks and data areas formed on the recording medium. Has a management information area that stores predetermined management information that is referred to as appropriate when accessing the data, and writes data to a nonvolatile storage medium that has a unique physical number in each area. Sometimes, when the writing destination moves from one recording track to another recording track, data is written to the data area during the movement. When the movement is completed, logical data is written to each sector of each recording track of the recording medium and each data area of the nonvolatile storage medium so that data is written to other recording tracks. An allocation unit that allocates a sector number and an access unit that accesses a recording medium or a non-volatile storage medium based on a logical sector number allocated by the allocation unit.

  In addition, in order to solve the above-described problem, the access method according to the present invention forms an annular recording track including a plurality of sectors of a predetermined size, and the recording track is concentric from the center to the outer peripheral side. Are formed, and each sector is assigned a unique physical sector number, a data area consisting of a plurality of areas of a predetermined size, and recording tracks and data areas formed on the recording medium. A composite storage device having a management information area in which predetermined management information that is appropriately referred to when accessing the storage is stored, and a nonvolatile storage medium in which each area is assigned a unique physical number In the access method of accessing the composite storage device, when accessing the composite storage device, the write destination from one recording track to the other recording track is recorded. Each recording track of the recording medium so that data is written to the data area during the movement and data is written to another recording track when the movement is completed. Assigning a logical sector number to each sector and each data area of a nonvolatile storage medium included in the storage, and accessing to access a recording medium or a nonvolatile storage medium based on the logical sector number assigned by the assignment process Process.

  In order to solve the above-described problem, the program according to the present invention forms a circular recording track including a plurality of sectors of a predetermined size, and the recording track is concentrically formed from the center to the outer peripheral side. A plurality of recording media, each of which is assigned a unique physical sector number, a data area consisting of a plurality of areas of a predetermined size, and a recording track and a data area formed on the recording medium. A composite storage device having a management information area in which predetermined management information to be referred to when accessing is stored, and a nonvolatile storage medium having a unique physical number in each area A program for causing a computer to execute access to a recording track when accessing a composite storage device. If the writing destination moves to another recording track, data is written to the data area during the movement, and when the movement is completed, data is written to the other recording track. And assigning a logical sector number to each sector included in each recording track of the recording medium and each data area of the nonvolatile storage medium, and based on the logical sector number assigned by the assigning step, the recording medium or This is for causing a computer to execute an access step of accessing a nonvolatile storage medium.

  The present invention can minimize the influence on the data transfer speed caused by track skew or the like.

  In addition, the present invention can improve the continuous data transfer performance without using a high-performance actuator such as a two-stage actuator and without performing complicated control, and can suppress an increase in cost. it can.

  Further, in the present invention, for example, it is possible to avoid a problem that occurs due to variations in mechanical parts, such as a case where natural resonance vibrations vary and vibrations accompanying a seek operation occur in a part of the product. .

  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 and a memory 11 that is used for arithmetic operations by the CPU 10.

  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, a control unit 27 that controls the servo control unit 23 and the read / write channel unit 24, a predetermined calculation, and a servo control unit The CPU and the arithmetic processing unit (CPU) 28 for setting and operating commands and parameters necessary for the read / write channel unit 24 and the like. 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.

  The recording medium 20 is managed by a FAT (File Allocation Table) file system, which will be described later, and a user data area (hereinafter referred to as a physical address) to which at least a predetermined data size (cluster) is assigned. , Referred to as a user area UA2), and 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.) adopting the FAT file system, and a series of addresses (for each predetermined data size (page)). Hereinafter, a data area (hereinafter referred to as a user area UA3) to which a memory address is attached, a system area SA in which predetermined management information is stored, and a user area UA1 in which predetermined information is stored. It consists of. The user area UA1 stores 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 consists of a FAT area FA.

  In the present invention, the user area UA2 of the recording medium 20 and the user area UA3 of the nonvolatile solid-state memory 26 are integrated by the FAT file system, and are integrated or partially integrated data area (hereinafter referred to as integrated data area DA). It is managed as.

  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.

  When the data is written, the buffer memory 25 temporarily buffers the data supplied from the host device 4 under the control of the control unit 27, and when the data reaches a predetermined amount, the data is read out. The read data is supplied to the read / write channel unit 24. Further, the buffer memory 25 temporarily buffers the data supplied from the read / write channel unit 24 under the control of the control unit 27 at the time of data reading, and when the data reaches a predetermined amount, the data The read data 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 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. Further, when performing the processing, the control unit 27 also performs processing related to encoding by error correction codes, error detection, and error correction.

  The control unit 27 assigns a logical sector number (LSN (Logical Sector Number)) that determines the order of writing the data supplied from the host device 4 to the recording medium 20 and the nonvolatile solid-state memory 26, as will be described in detail later. Process.

  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 and recorded in a plurality of clusters. Therefore, any file can be accessed by referring to the FAT. A file system managed using FAT is called a FAT file system. Hereinafter, in this embodiment, the cluster number is obtained by simply dividing a logical block address LBA (Logical Block Address) by N, and N = 16 in the description. The LBA is an address used by the host device 4 when the host device 4 accesses the composite storage device 2.

  The FAT file system volume includes three areas: a reserved area A, a FAT area B, and a directory / data area C. In this example, since one partition is assumed, the volume and the partition are the same. Further, the directory / data area C includes a directory item D, and information related to the file name and the start cluster number of the file is stored in the directory item D.

  In addition, the format includes a physical format for dividing the recording medium 20 into tracks and sectors by writing servo information and other information, and a logical position of management data used by the OS after the physical formatting and data to be recorded. It consists of a logical format to be set. In the present invention, the system area SA, the user area UA1, the user area UA2, and the user area UA3 are created after the logical format is completed.

  Here, the LBA space will be described with reference to FIG. 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. Therefore, one cluster is 8 Kbytes. The host device 4 accesses the recording medium 20 using a logical block address (LBA). In the FAT file system for managing files, one cluster is set as a minimum unit for reading and writing data.

  For example, the host device 4 reads a directory item D by issuing a predetermined command in order to obtain the arrangement information of File1. Then, the host device 4 extracts the start cluster number “12340h” from the read directory item D, refers to the FAT area B, and searches for a FAT entry (FAT Entry) corresponding to the start cluster number “12340h”. The cluster number “12341h” in which continuous data is stored is detected. Then, the cluster numbers of consecutive data are sequentially detected, and the detection is continued until EOF (End of File). The EOF is the cluster number “1237Fh”. Further, as described above, a method in which the host device 4 accesses each cluster while mainly referring to the FAT information is referred to as a normal mode (AV mode).

  The host device 4 accesses each cluster based on the arrangement information from the start cluster number “12340h” to the EOF cluster number “1237Fh”, and reads the stored data.

  On the other hand, the storage area of the recording medium 20 in the composite recording apparatus 2 is managed by two physical addresses and logical addresses in units of sectors. The physical address is composed of a medium surface number, a track number, and a sector number.

  Further, it is assumed that the storage area of the nonvolatile solid-state memory 26 is managed in units of pages, the page size is the same as the normal sector size, and a unique page number is assigned to each page.

  The reason why the two addresses of the physical address and the logical address are introduced in the composite memory device 2 is to perform the recording by the track skew method and the substitute process of the defective sector.

  As shown in FIG. 3, the control unit 27 of the composite memory device 2 allocates the user area UA2 of the recording medium 20, the user area UA1 and the user area UA3 of the nonvolatile solid-state memory 26 as LBA spaces. 3A shows a configuration (logical sector number (LSN)) inside the composite storage device 2, and FIG. 3B shows a configuration of the composite storage device 2 recognized by the host device 4. (Logical block address (LBA)).

  Further, as shown in FIG. 4, the control unit 27 of the composite storage device 2 is non-volatile with the recording medium 20 for a part of the user area UA1, a part of the user area UA2, and a part of the user area UA3. The LBA space may be allocated by overlapping the solid-state memories 26. In FIG. 4, the recording medium 20 and the non-volatile solid memory 26 are allocated to a part of the areas of the user area UA1, the user area UA2, and the user area UA3, but only a part of the user area UA1 is allocated. You may allocate so that it may overlap.

  By assigning the recording medium 20 and the non-volatile solid memory 26 so as to overlap with each other, for example, FAT or the like is recorded on both the recording medium 20 and the non-volatile solid memory 26, which is a robust system. Construction is possible.

  The system area SA is an area used by the CPU 28 in the composite storage device 2 for storing boot codes and various tables, or as an area for secondary defect replacement processing.

  The disk cache area DA is used for the purpose of temporarily storing data. In FIG. 2, an area (124 MByte) from logical sector number “02000h” to logical sector number “3FFFFh” is allocated. Further, “40000h” is assigned as the logical sector number of the master boot record. In the data access system 1, a restriction is provided so that the host device 4 cannot directly write to the disk cache area DA by specifying an address.

  The user area UA1 includes a reserved area A and a FAT area B including MBR (Master Boot Record) and PBR (Partition Boot Record). The MBR is a sector of LBA “0” when viewed from the host device 4 and records a bootstrap code and a partition table.

  The user area UA2 contains a directory item D for managing file information and actual data. Prior to FAT32, only the root directory was separated as a separate area. The directory item D stores file name, extension, attribute, latest update time, start cluster number, and file size information for each directory (each file).

  The user area UA3 is an area which is set so that normal writing cannot be performed from the host device 4, and can be written only under the management of the composite storage device 2 when a predetermined mode is selected.

  Here, the process of assigning logical sector numbers by the control unit 27 will be described below with reference to FIG. One track consists of 16 sectors, and the track skew is 2 sectors. In FIG. 5, a white block represents one sector included in each recording track of the recording medium 20, and a hatched block represents the non-volatile solid-state memory 26 corresponding to the sector of the recording medium 20. Represents one page. FIG. 5 also shows the logical sector number a assigned by a conventional method and the logical sector number b assigned by the present invention for easy comparison. In FIG. 5, it is assumed that the primary defect and the secondary defect have not occurred.

  In the conventional logical sector number assignment method, as shown in the logical sector number a, the logical sector number “0” is assigned to the sector having the physical sector number “0” of the recording track 1, A logical sector number is assigned to a sector. When the logical sector number “15” is assigned to the sector having the physical sector number “15” (the last sector of the recording track 1), the logical sector number “15” is assigned to the sector having the physical sector number “18” of the recording track 2. 16 "is assigned. Therefore, in the conventional recording apparatus, each sector is accessed according to the logical sector number assigned in this way. Therefore, the time required for the track skew (2 sectors) when moving from the recording track 1 to the recording track 2 is reduced. The write operation was interrupted.

  On the other hand, the control unit 27 assigns a logical sector number “0” to a sector having a physical sector number “0” of the recording track 1 of the recording medium 20, and sequentially assigns a logical sector number to other sectors. When the logical sector number “15” is assigned to the sector having the number “15” (the last sector of the recording track 1), the logical sector number “16” is assigned to the page having the page number “0” in the nonvolatile solid-state memory 26. The logical sector number “17” is allocated to the page with the page number “1”.

  In addition, the control unit 27 skips the physical sector numbers “16” and “17” of the recording track 2 due to the track skew, and assigns the logical sector number “18” to the sector having the physical sector number “18”. Then, logical sector numbers are assigned to other sectors and pages as appropriate.

  Thus, the head unit 21 can access (write data) the nonvolatile solid-state memory 26 for the time required for moving from the recording track recording track 1 to the recording track 2 (time for two sectors). Therefore, it is possible to continue writing data supplied from the host device 4 without interruption.

  Next, another process for assigning a logical sector number by the control unit 27 will be described below with reference to FIG.

  When the control unit 27 assigns the recording medium 20 and the nonvolatile solid-state memory 26 to overlap a part of the user area UA1, the user area UA2, and the user area UA3, as schematically shown in FIG. For example, the same logical sector number (b) “15” is assigned to the physical sector number “15” of the recording track 1 and the page number “0” of the nonvolatile solid-state memory 26, and the physical sector number “ 17 ”and the same logical sector number (b)“ 32 ”are assigned to the page number“ 2 ”of the nonvolatile solid-state memory 26.

  By doing so, the same data is written to the physical sector number “15” of the recording track 1 and the page number “0” of the nonvolatile solid-state memory 26, and the physical sector number “17” of the recording track 2 is written. The same data is written in the page number “2” of the nonvolatile solid-state memory 26. Even if one data is lost, the other data remains, so that a more robust system can be constructed. .

  FIG. 7 is a schematic diagram of logical sector numbers assigned by the above method. User area UA2 and user area UA3 are alternately assigned at predetermined intervals. In the actual recording medium 20, there is an individual difference in the seek performance for each recording medium 20, and also in the recording medium 20, there is a variation in seek operation at the place (position) where the seek operation is performed. Considering these factors, it is desirable to assign a logical sector number. Specifically, when a track skew is obtained by a test before shipment or a self-learning function after shipment, logical sector numbers are assigned according to the time.

  In this embodiment, the case where data supplied from the host device 4 is continuously transferred and written to the composite storage device 2 is seek-moved from one recording track to another adjacent recording track. However, even when the head unit 21 is switched from one recording medium to another recording medium or the head unit 21 is switched from one side of the one recording medium to the other side, logical sector numbers are appropriately assigned. Need to do work. Even in this case, logical sector numbers may be assigned according to the skew time.

  The data access system 1 configured as described above writes data to the non-volatile solid-state memory 26 for the time of track skew required for moving from one recording track to another recording track, and the head unit 21 performs other recording. Since the logical sector number is assigned so that data can be written to the recording medium 20 again when the data can be written to the recording track, the data supplied from the host device 4 can be continuously written without interruption. Therefore, the influence on the data transfer speed caused by the track skew can be minimized.

  In the present invention, it is possible to improve the continuous data transfer performance without using a high-performance actuator such as a two-stage actuator and without performing complicated control, and to suppress an increase in cost. In addition, the load on the CPU 28 in the composite storage device 2 can be reduced.

  Further, in the present invention, for example, it is possible to avoid a problem that occurs due to variations in mechanical parts, such as a case where natural resonance vibrations vary and vibrations accompanying a seek operation occur in a part of the product. .

  Even in the existing actuator, the required performance for one track seek can be lowered, so that the design policy can be reviewed. The time required for one track seek is dominant over the time required for subsequent settling rather than the time required for movement of one track. On the other hand, it takes longer to move the track when seeking at a medium distance or a long distance. These are sometimes contradictory when designing. Therefore, if the time required for settling during one track seek can be reduced by using the logical sector number assignment method according to the present invention, an actuator with lower cost and higher performance can be manufactured.

  The invention of the present application contributes to the improvement of the continuous transfer rate of data, and is first effective for writing to the disk cache area.

  The operation in units of superclusters increases the rate of continuous data transfer. Therefore, in the present invention, by combining with disk scheduling, it is possible to realize a more stable and high transfer rate. Note that defragmentation relocates files and empty areas as much as possible as much as possible, resulting in an increase in the rate of continuous data transfer.

  Although the present invention is particularly effective for a storage device having a function of controlling address information necessary for accessing data, the present invention is not limited thereto, The present invention provides a technique that is effective in a storage device that involves a seek operation during continuous data transfer.

  In this embodiment, the recording medium 20 is described as a specific example of a storage device using a rotational recording medium. However, any other random-accessible storage device that performs track seek during continuous transfer can be used. Similar processing is possible.

  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. It is a schematic diagram about the LBA space in the case of managing with a predetermined file format. It is a figure which shows typically an example of the structure (logical sector number (LSN)) inside a composite type | mold storage apparatus, and the structure (logical block address (LBA)) of the composite type | mold storage apparatus recognized by a host apparatus. It is a figure which shows typically another example of the structure (logical sector number (LSN)) inside a composite type | mold storage apparatus, and the structure (logical block address (LBA)) of the composite type | mold storage apparatus recognized by a host apparatus. . It is a figure where it uses for description of the allocation method of a logical sector number. It is a figure where it uses for description of the allocation method of a logical sector number. FIG. 6 is a schematic diagram of logical sector numbers assigned by the method of FIG. 5. It is a figure with which it uses for description about the method of assigning a logical sector number employ | adopted conventionally.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Data access system, 2 Compound storage device, 3 Interface part, 4 Host apparatus, 10, 28 CPU, 11, 29 Memory, 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 control section

Claims (6)

A plurality of sectors of a predetermined size are included to form an annular recording track, and a plurality of the recording tracks are formed concentrically from the center to the outer periphery, and each sector has a unique physical sector number. A recording medium attached,
There is a data area composed of a plurality of areas of a predetermined size, and a management information area in which predetermined recording information that is appropriately referred to when accessing the recording track and the data area formed on the recording medium is stored. And each area has its own physical number assigned to a non-volatile storage medium,
When writing data, if the writing destination moves from one recording track to another recording track in the recording medium, the data is written to the data area during the movement, and the movement Is completed, each sector included in each recording track of the recording medium and each area of the data area of the nonvolatile storage medium so that data is written to the other recording track. Assigning means for assigning logical sector numbers;
A composite storage device comprising: access means for accessing the recording medium or the nonvolatile storage medium based on the logical sector number assigned by the assigning means.   The assigning means assigns the same logical sector number to a part of each sector included in each recording track of the recording medium and a part of each area of the data area of the nonvolatile storage medium. The composite storage device according to claim 1, wherein:   The allocating means writes data to the data area during a seek time caused by a track jump from one recording track to another recording track of the recording medium, and when the seek time has elapsed, A logical sector number is assigned to each sector included in each recording track of the recording medium and each area of the data area of the nonvolatile storage medium so that data is written to the recording track. The composite storage device according to claim 1. The recording medium is composed of a plurality of recording media,
The assigning means writes data to the data area when the recording medium is changed from the one recording medium to another recording medium, and when the change is completed, 2. A logical sector number is assigned to each sector included in each recording track of the recording medium and each area of the data area of the nonvolatile storage medium so that data is written. The composite storage device described. A plurality of sectors of a predetermined size are included to form an annular recording track, and a plurality of the recording tracks are formed concentrically from the center to the outer periphery, and each sector has a unique physical sector number. Attached recording medium, a data area composed of a plurality of areas of a predetermined size, the recording track formed on the recording medium, and predetermined management information that is appropriately referred to when accessing the data area are stored. In an access method for accessing a composite storage device having a management information area and a nonvolatile storage medium having a unique physical number in each area,
When the write destination moves from one recording track to another recording track when accessing the composite storage device, data is written to the data area during the movement. When the movement is completed, each sector included in each recording track of the recording medium and the data area of the non-volatile storage medium so that data is written to the other recording track. An allocation process for assigning logical sector numbers to each area;
And an access step of accessing the recording medium or the nonvolatile storage medium based on the logical sector number assigned in the assignment step. A plurality of sectors of a predetermined size are included to form an annular recording track, and a plurality of the recording tracks are formed concentrically from the center to the outer periphery, and each sector has a unique physical sector number. Attached recording medium, a data area composed of a plurality of areas of a predetermined size, the recording track formed on the recording medium, and predetermined management information that is appropriately referred to when accessing the data area are stored. A program for causing a computer to execute access to a composite storage device having a management information area, and each area having a nonvolatile storage medium to which a unique physical number is assigned. And
When the write destination moves from one recording track to another recording track when accessing the composite storage device, data is written to the data area during the movement. When the movement is completed, each sector included in each recording track of the recording medium and the data area of the non-volatile storage medium so that data is written to the other recording track. An allocation process for assigning logical sector numbers to each area;
A program for causing a computer to execute an access step of accessing the recording medium or the nonvolatile storage medium based on the logical sector number assigned by the assignment step.

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