JP2009059444A - Information processing device and information processing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information processing device capable of preventing corruption of data outside the range of a writing request even when power supply is interrupted or a recording medium is pulled out during writing. <P>SOLUTION: The information processing device comprises: an access control part for controlling recording of recorded data in a recording medium or reading of the recorded data from the recording medium; and a recorded data storage part for temporarily storing recorded data output to the recording medium as backup data. The access control part verifies whether the recording start position and/or the recording end position of recorded data input by a logical sector unit in the recording medium is different from the division position of a physical sector which is an access unit to the recording medium. If the verification result shows that the position is different from the division position of the physical sector, recorded data to be recorded in the recording medium is stored in a recorded data storage unit, and the recorded data is output to the recording medium after completion of the storing. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an information processing apparatus and an information processing method, and more specifically, in a configuration for performing data recording / playback processing using a hard disk or the like as a recording medium, a data unit as an access unit used by an application or device driver, and a recording medium The present invention relates to an information processing apparatus and an information processing method applied in a system having a different data unit managed internally.

  In a digital video camera, a personal computer (PC), and other information processing apparatuses, information recording and information reproduction processing using a recording medium (media) such as a hard disk (HDD) is performed. When executing information recording processing and information reproduction processing using a recording medium, an application built in the information processing apparatus generates recording data or specifies reproduction data, and via a device driver corresponding to the recording medium, Recording data is output to the recording medium or reproduction data is input from the recording medium.

  For example, an application or a device driver performs access using LBA (Logical Block Addressing) in units of 512 bytes. There is no problem if the 512-byte LBA access unit matches the management data unit inside the recording medium such as an HDD, but a problem may occur in a system that does not match.

Specifically, for example, N logical sectors (Logical) are used as access units inside the HDD.
physical sector (Physical Sector) in a group of al Sector
) Is available. By increasing the management unit inside the HDD, for example, ECC (E
increase the processing unit by increasing the setting unit of the error correction code)
There is an effect that the storage area can be efficiently used by reducing the ECC data.

  In this way, when the data access unit of the upper layer (application or device driver) is different from the data access unit controlled inside the recording medium, the access unit of the recording medium is set to be larger than the access unit of the upper layer. For example, when a certain data recording or reproduction area is designated from the upper layer to the recording medium, the designated area and the data area managed collectively are also read and recorded collectively within the recording medium. Processing will be executed.

  For example, when the application reads and updates the data recorded on the recording medium, the update process on the application side is executed in units of logical sectors. However, in the recording medium, the recording medium temporarily includes the sector data to be updated. Data is read in units of access, that is, in physical sector units, and temporarily stored in the internal memory of the recording medium, and only the update data portion input from the application via the device driver is updated and re-recorded. .

  In such processing, it is assumed that a physical sector read error occurs in the recording medium. The updated logical sector data is replaced with the data updated by the application, and is recorded in, for example, a spare area which is an emergency data recording area of the recording medium. However, for non-updated sector data contained in the same physical sector as the updated logical sector, dummy data temporarily stored in the memory inside the recording medium is directly stored in the spare area due to a read error that occurs inside the recording medium. It will be recorded, and the same situation will occur if the non-updated data is lost. In this case, the upper application or device driver cannot detect data loss at all.

  Therefore, in the file system higher than the device driver, the recording data is controlled without being aware of the number of sectors managing ECC, and the device driver records on the recording medium based on the number of sectors managing ECC. There is a technology that tries to prevent data loss.

  However, even when data is controlled in this way, when the LBA access unit does not match the management data unit inside the recording medium, the power is shut off or the recording medium is removed during recording in the physical sector. There is a problem that data outside the range of the write request is destroyed.

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a power supply in the middle of writing when the LBA access unit does not match the management data unit in the recording medium. It is an object of the present invention to provide a new and improved information processing apparatus and information processing method in which data outside the range of the write request is not destroyed even when the recording medium is removed or the recording medium is removed.

  In order to solve the above problems, according to an aspect of the present invention, an information processing apparatus for recording data on a recording medium, which controls recording of recording data to the recording medium and reading of recording data from the recording medium An access control unit, and a recording data storage unit that temporarily stores the recording data to be output to the recording medium as backup data. The access control unit starts recording the recording data to be input to the recording medium in units of logical sectors It is verified whether the position and / or the recording end position is different from the physical sector division position which is an access unit to the recording medium, and if the result of the verification is different from the physical sector division position, recording is performed in the recording data storage unit. Recording information to be recorded on a medium is stored, and when the storage is completed, the recording data is output to the recording medium. Location is provided.

  According to this configuration, the access control unit controls recording of the recording data to the recording medium and reading of the recording data from the recording medium, and the recording data storage unit temporarily uses the recording data output to the recording medium as backup data. Store. Then, the access control unit verifies whether the recording start position and / or the recording end position of the recording data input to the recording medium in units of logical sectors is different from the physical sector division position that is an access unit to the recording medium. As a result of the verification, if it is different from the physical sector division position, the recording data to be recorded on the recording medium is stored in the recording data storage unit, and when the storage is completed, the recording data is output to the recording medium. As a result, when the LBA access unit does not match the management data unit inside the recording medium, data outside the write request range will not be destroyed even if the power is cut off or the recording medium is removed during the writing. Can be protected.

  The access control unit may confirm whether valid backup data exists in the recording data storage unit when an error occurs when reading the recording data from the recording medium. As a result, by confirming the presence of the backup data, the data that should be read can be read from the recording data storage unit.

  When valid backup data exists, the access control unit may output the backup data to the original storage position of the recording medium. As a result, when the storage location of the recording medium is accessed thereafter, the data that should be read out can be read from the recording medium without causing an error.

  In order to solve the above problem, according to another aspect of the present invention, there is provided an information processing method for recording data on a recording medium, the recording of recording data on the recording medium and the recording data from the recording medium. An access control step for controlling reading; and a recording data storage step for temporarily storing recording data to be output to the recording medium as backup data. The access control step includes recording data input to the recording medium in units of logical sectors. A verification step for verifying whether the recording start position and / or the recording end position of the recording medium are different from the physical sector division position as an access unit for the recording medium, and as a result of the verification step verification, are different from the physical sector division position In this case, a storage step for storing recording data to be recorded on the recording medium in the recording data storage unit, and storage Characterized in that it comprises Ryosuru and output step of outputting the recorded data on the recording medium, the information processing method is provided.

  According to this configuration, the access control step controls recording of the recording data to the recording medium and reading of the recording data from the recording medium, and the recording data storage step temporarily uses the recording data output to the recording medium as backup data. Store. The verification step verifies whether the recording start position and / or the recording end position of the recording data input to the recording medium in units of logical sectors are different from the physical sector division position that is an access unit to the recording medium, The output step stores the recording data to be recorded on the recording medium in the recording data storage unit when the verification result in the verification step is different from the physical sector division position, and when the storage is completed, the recording step Output data. As a result, when the LBA access unit does not match the management data unit inside the recording medium, data outside the write request range will not be destroyed even if the power is cut off or the recording medium is removed during the writing. Can be protected.

  As described above, according to the present invention, when the LBA access unit does not coincide with the management data unit inside the recording medium, the data processing apparatus which is new and improved in which data outside the range of the write request is not destroyed, and An information processing method can be provided.

  Exemplary embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol.

First, a problem based on a difference between an access unit of an upper layer (application or device driver) and an access unit of a recording medium will be described with reference to FIGS. In the following, access to a recording medium from an upper layer (application or device driver) is executed in units of 512-byte LBA (Logical Block Addressing) designation, that is, in units of logical sector (Logical Sector). An example in which the access unit in the recording medium is executed in units of physical sectors (Physical Sectors) corresponding to the N logical sectors will be described. N is 2 or more.

  FIG. 1 is an explanatory diagram showing a correspondence example between a logical sector (LBA) that is an access unit of a device driver and a physical sector that is an access unit of a recording medium (for example, HDD). FIG. 1 shows (a) logical sectors and (b) physical sectors. In this example, the physical sector consists of two logical sectors. That is, the number N of logical sectors included in one physical sector is N = 2.

  Here, N is a value calculated by N = (physical sector) / (logical sector), and means the number of logical sectors that are actually managed as one group inside the HDD.

  Further, one (X) is entered next to the logical sector (LBA = 60) shown in FIG. 1, and then the logical sector (LBA = 61) is set. Thus, there may be a point where the correspondence between the logical sector and the physical sector changes. That is, it is an LBA whose phase changes, and X is the logical sector (LBA) at this phase change point. In the example shown in FIG. 1, X = 61.

  The relationship of physical sector number = logical sector number (LBA) × M ÷ N (M ≧ 0) is established in the region of LBA = 0 to X−1, but the relationship is not established in the region of LBA = X to MAX. For example, as shown in the figure, when the number of logical sectors N included in one physical sector is N = 2, the physical sector number = (logical sector number (LBA) +1) × M ÷ N (M ≧ 0).

  In the example shown in FIG. 1, N = 2. For example, the information stored in LBA = 2 and the information stored in LBA = 3 are collectively managed in the HDD, and the physical sector number = 1. It is managed as information. In the data recording or reproducing process, data is read from or written to the recording medium in units of physical sectors in the HDD.

  FIG. 1 shows an example in which the phase change point X is X = 61. In the area from LBA = 0 to 60, even addresses (0, 2, 4, 6. Although aligned with the head of the sector, in the area after LBA = 61, odd addresses (61, 63, 65...) Of the LBA are aligned with the head of the physical sector.

  Next, referring to FIG. 2 and FIG. 3, a problem in access processing when the access unit (logical sector (LBA)) of the upper layer (application or device driver) is different from the access unit (physical sector) of the recording medium The point will be described.

  FIG. 2 shows a part corresponding to a sector in which the number of logical sectors N included in one physical sector is N = 2 and the phase conversion point X is X = 61, as in FIG.

  When the device driver issues a write request to the HDD specifying the write start LBA = 77 and the number of write sectors = 1, the data write process is executed in the HDD as shown in FIG. Is done.

  First, the contents of LBA = 77 to 78 of physical sector number = 39 are read out to the HDD internal buffer (step S11). Next, the data of LBA = 77 is updated in the buffer inside the HDD. This update data is supplied from the upper device driver (step S12). Finally, the updated contents of LBA = 77 to 78 are written as the contents of physical sector number = 39 (step S13).

  By such processing, update data is recorded. As can be understood from this processing, the data of LBA = 78 is simply read into the buffer inside the HDD and rewritten.

  Next, problems in the processing example of FIG. 2 will be described with reference to FIG. FIG. 3 is an explanatory diagram for explaining processing when an error occurs in the data reading process to the HDD internal buffer in step S11, which is a process in the HDD, in the processing example of FIG. In the HDD, as shown in FIG. 3, the data writing process to the hard disk is executed in the following flow.

  The contents of LBA = 77 to 78 of physical sector number = 39 are read into the HDD internal buffer (step S21). It is assumed that the reading process has failed at this point. Then, because of a read error, dummy data corresponding to LBA = 77 to 78 of physical sector number = 39 is set in the buffer in the HDD, and the data of LBA = 77 is updated to this dummy data (step S22). This update data is supplied from a higher-level device driver. Finally, the updated contents of LBA = 77 to 78 are written as the contents of physical sector number = 39 in the spare area (alternate sector), which is the area used when a read error occurs (step S23).

  When data is updated in the above flow, the data written in the spare area (alternate sector) is LBA = 77 is update data provided from the device driver, and LBA = 78 is dummy data set in the HDD. That is, a situation occurs in which data of LBA = 78 other than the update target LBA is lost. Even if such a situation occurs, the host application or device driver cannot detect the loss of LBA = 78 data, and determines that normal recording has been performed.

  In the present embodiment, a configuration for preventing occurrence of data loss as described with reference to FIG. 3 is proposed. The information processing apparatus and information processing method according to the present embodiment will be described below.

  The information processing apparatus according to the embodiment of the present invention avoids falling into the situation as shown in FIG. 3, and at least the number of logical sectors N included in one physical sector is set in an upper layer, for example, an application or a device driver. Issue a write request with awareness. Note that in a system having a phase change point, it is preferable to perform processing that also considers the phase change point X.

  The process for issuing a write request for a recording medium (for example, HDD) executed by the device driver is executed as a process for issuing a write request in consideration of the number N of logical sectors included in at least one physical sector. Specifically, a write request is made by determining whether or not a process that requires data read, update, and rewrite processing from the recording medium to the internal buffer of the recording medium occurs.

  Data read, update, and rewrite processing from the recording medium to the internal buffer of the recording medium is processing shown in the flow of FIGS. 2 and 3 and is called read-modify-write (RMW) processing. When this read-modify-write process occurs, the data read data from the recording medium is written to the internal buffer of the recording medium in the memory area accessible by the device driver itself, and in the physical area unit in the memory area accessible by the device driver. Execute data read, update, and rewrite processing.

  A specific processing example will be described with reference to FIG. The RMW process is executed when the boundary of the data access start position or end position of the device driver does not coincide with the boundary of the physical sector that is the access unit of the recording medium. That is, in this case, the memory area accessible by the device driver is written in the memory area accessible by the device driver itself (buffer area corresponding to the device driver) by writing the data read data from the recording medium to the internal buffer of the recording medium. The data read, update and rewrite processes are executed in physical sector units.

  4A to 4C are explanatory diagrams for explaining the necessity of RMW processing according to the data access mode of the device driver.

  FIG. 4A shows an example in which both of the boundary of the data access start position and the end position of the device driver coincide with the boundary of the physical sector that is the access unit of the recording medium. , RMW processing becomes unnecessary.

  FIG. 4B is an example in which one of the two boundaries of the device driver data access start position and the end position does not match the boundary of the physical sector that is the access unit of the recording medium. Requires RMW processing.

  4B is an example in which the data access start position of the device driver does not coincide with the boundary of the physical sector that is the access unit of the recording medium. In this case, the logical sector number of the data access start position is shown. RMW processing for one physical sector including the logical sector number before is required.

  4B is an example in which the data access end position of the device driver does not coincide with the boundary of the physical sector that is the access unit of the recording medium. In this case, the logical sector number of the data access end position is shown. RMW processing for one physical sector including the subsequent logical sector number is required.

  FIG. 4C shows an example in which neither of the two boundaries of the data access start position and the end position of the device driver coincides with the boundary of the physical sector that is the access unit of the recording medium. At the access start position, one physical sector including the logical sector number before the logical sector number at the data access start position, and at the access end position, one physical sector including the logical sector number after the logical sector number at the data access end position. The RMW process to be processed is required.

  FIG. 5 is an explanatory diagram showing the necessity of RMW processing corresponding to each writing mode in FIGS. 4A to 4C divided into a data access start position and an end position. A device driver (which may be an application) that executes data access, based on address information (LBA) when executing data access, (A), (B-a), (B-) shown in FIGS. It is determined which of b) and (C) is supported, the necessity of the RMW process is determined, and the RMW process is executed if necessary.

  In the device driver, the RMW necessity determination process based on the address information (LBA) is executed as follows.

  First, the write start LBA and the number of write sectors are determined by the application. Further, the device driver calculates the write end LBA as write end LBA = write start LBA + write sector number−1.

Further, the number N of logical sectors included in one physical sector and the phase conversion point X are input, and RMW necessity determination processing according to the following algorithm is executed.
if (write start LBA <X) {
LBA = 0 as a discrimination criterion;
} Else {
LBA = X serving as a discrimination criterion;
}
if (write start LBA-discrimination criterion LBA)% N) {
RMW (Read Modify Write) is required for the data head;
} Else {
RMW (read modify write) is not required for the beginning of data;
}
if (write end LBA−discrimination criterion LBA)% N) {
RMW (read modify write) is required for the end of data;
} Else {
RMW (read modify write) is not required for the end of data;
}

  In this way, the device driver writes as write end LBA = write start LBA + write sector number−1 based on the write start LBA, the number of write sectors, the number of logical sectors N included in one physical sector, and the phase conversion point X. The end LBA is calculated, and RMW necessity determination processing according to the above algorithm is executed. When RMW processing is required by this determination processing, RMW processing is performed that involves reading, updating, and rewriting data from the recording medium in units of physical sectors in a memory (buffer) accessible from the device driver.

  Here, specific processing examples in the respective cases (A), (Ba), (BB), and (C) shown in FIGS. 4 and 5 will be described.

  FIG. 4A shows an example in which both of the boundary of the data access start position and the end position of the device driver coincide with the boundary of the physical sector that is the access unit of the recording medium. , RMW processing becomes unnecessary.

  FIG. 4B is an example in which one of the two boundaries of the device driver data access start position and the end position does not match the boundary of the physical sector that is the access unit of the recording medium. Requires RMW processing.

  4B is an example in which the data access start position of the device driver does not coincide with the boundary of the physical sector that is the access unit of the recording medium. In this case, the logical sector number of the data access start position is shown. RMW processing for one physical sector including the logical sector number before is required.

  The data recording process including the RMW process in the case of (Ba) in FIG. 4 will be described with reference to FIGS. (1) in FIG. 6 is an explanatory diagram similar to FIG. 4 (B-a), in which RMW processing is performed for one physical sector including a logical sector number preceding the logical sector number corresponding to the data access start position. Indicates that it is necessary.

  FIG. 6B is an explanatory diagram for explaining data copy processing of each memory in the device driver when executing this read-modify-write (RMW). The device driver receives recording data from the application during processing such as data recording. The received data is recorded in a first memory area accessible by the device driver. This data is data shown in the (M1) first memory area in (2) of FIG. This data is the same as the data shown in (1) of FIG.

  The device driver selects data requiring RMW processing from the received data, and records it in the (M2) RMW memory (buffer). In this RMW memory (buffer), data in units of physical sectors received from the control unit that controls the recording medium is recorded in advance, and thereafter, logical sector data corresponding to this physical sector is (M1) first. The memory area selected from the memory area is copied, and at least a part of the sector data of the physical sector unit data received from the control unit of the recording medium is overwritten and updated. Data in units of physical sectors including the update data is output to the recording medium.

  The device driver executes processing using such RMW memory for the data subject to RMW processing ([D1] shown in (1) and (2) of FIG. 6). Data, that is, data not subject to RMW processing ([D2] shown in (1) of FIG. 6) is output directly from the first memory area to the recording medium without passing through the RMW memory (M1).

A processing sequence in the device driver will be described with reference to FIG. First, the device driver determines a logical sector address (LBA) for RMW processing read (step S51). This LBA corresponds to LBA1 shown in (M2) RMW memory (buffer) in (2) of FIG. That is, the logical sector address (LBA) corresponding to the start position of the physical sector unit is determined. Next, N sectors of data are read from the recording medium from the determined LBA (LBA1) (step S52). N is the number of logical sectors included in one physical sector. For example, in the example shown in FIG. 6, N = 2, and data for two logical sectors, that is, data for one physical sector is read from the media and recorded in the (M2) RMW memory (buffer). .

  Next, (M2) update processing based on the data received from the application is executed on one physical sector data recorded in the RMW memory (buffer) (step S53). This process is executed as an inter-memory copy process shown in (2) of FIG. Next, the updated contents of the RMW buffer are recorded on the media (step S54). Thereafter, data other than the RMW process target, that is, data [D2] shown in (1) of FIG. 6 is recorded on the recording medium (step S55). Data recording processing is performed by such processing.

  Next, data recording processing including RMW processing in the case of (B-b) in FIG. 4 will be described with reference to FIGS. (1) in FIG. 8 is the same diagram as (B-b) in FIG. 4, and RMW processing is performed for one physical sector including a logical sector number after the logical sector number corresponding to the data access end position. Indicates that it is necessary.

  (2) of FIG. 8 is a diagram for explaining data copy processing for each memory in the device driver when executing this RMW processing. The device driver receives recording data from the application during processing such as data recording. The received data is recorded in a first memory area accessible by the device driver. This data is data shown in the (M1) first memory area of (2) in FIG. This data is the same as the data shown in (1) of FIG.

  The device driver selects data requiring RMW processing from the received data, and records it in the (M2) RMW memory (buffer). In this RMW memory (buffer), data in units of physical sectors received from the control unit of the recording medium is recorded in advance, and then logical sector data corresponding to the physical sectors is (M1) first memory area. To copy data between memories, and at least a part of the sector data of the physical sector unit received from the control unit of the recording medium is overwritten and updated. Data in units of physical sectors including the update data is output to the recording medium.

  The device driver executes processing using such RMW memory for the data subject to RMW processing ([D1] shown in (1) and (2) of FIG. 8), and so on. Data, that is, data not subject to RMW processing ([D2] shown in (1) of FIG. 8) is output directly from the first memory area to the recording medium without going through the RMW memory (M1). .

  A processing sequence in the device driver will be described with reference to FIG. First, the device driver records data not subject to RMW processing, that is, data [D2] shown in FIG. 8 on the medium (step S71). Next, a logical sector address (LBA) for reading in the RMW process is determined (step S72). This LBA corresponds to LBA1 shown in (M2) RMW memory (buffer) in (2) of FIG. That is, the logical sector address (LBA) corresponding to the start position of the physical sector unit is determined. Next, N sectors of data are read from the recording medium from the determined LBA (LBA1) (step S73). N is the number of logical sectors included in one physical sector. For example, in the example shown in FIG. 8, N = 2, and data for two logical sectors, that is, data for one physical sector is read from the media and recorded in the (M2) RMW memory (buffer).

  Next, (M2) update processing based on the data received from the application is executed on one physical sector data recorded in the RMW memory (buffer) (step S74). This process is executed as an inter-memory copy process shown in (2) of FIG. Finally, the updated contents of the RMW buffer are recorded on the media (step S75). Data recording processing is performed by such a series of processing.

  4 and 5C, both the RMW process at the data recording start position described with reference to FIGS. 6 and 7 and the RMW process at the data recording end position are executed. become.

  Next, a configuration example and a processing example of the information processing apparatus according to the embodiment of the present invention will be described. An information processing apparatus according to an embodiment of the present invention is an apparatus that performs data recording on an information recording medium or data reproduction processing from the information recording medium. The information processing apparatus is an apparatus such as a digital video camera or a PC.

  The configuration of the information processing apparatus will be described with reference to FIGS. FIG. 10 is an explanatory diagram showing the configuration of an information processing apparatus that accesses an information recording medium 284 such as a hard disk and executes data recording or data reading for each processing hierarchy. As shown in FIG. 10, when data is recorded on an information recording medium 284 such as a hard disk or when data recorded on the information recording medium 284 is read and used, a processing request from the user is issued. An application 281 exists in the uppermost layer as a window with the user for receiving and providing a user interface. A file system (file management program) 282 for managing files on the information recording medium 284 and a device driver 283 for controlling the information recording medium 284 based on information from the file system exist below the application 281. .

  When data is recorded on or reproduced from the information recording medium 284, for example, a request via the application 281 is transmitted to the file system 282 and the device driver 283, and the file system 282 and the device driver 283 are transmitted. Data writing and reproduction are executed by this function. The processing is performed with a configuration such as a file system 282-device driver 283-information recording medium (hard disk) 284 by the same processing as before.

  When data recording is performed, when a plurality of different files are applied as continuous recording files, special codes are recorded in a file allocation table (FAT) applied by the file system. When a plurality of different files are applied as continuous recording files when data reproduction is executed, file switching is executed on condition that a special code is detected from the FAT.

  FIG. 11 shows a configuration diagram showing the file system in the system configuration shown in FIG. 10 in more detail. FIG. 11 is an explanatory diagram showing the system configuration of an information processing apparatus that executes data recording on an information recording medium, data acquisition from the information recording medium, and reproduction processing, as in FIG. The system configuration | structure of the information processing apparatus which performs the process which records data with respect to the media A361 and media B362 which are examples of the recording medium of invention, and reads and utilizes the data currently recorded on the recording medium is shown Yes.

  In FIG. 11, similarly to FIG. 10, a file A (media management program) 310 for managing files on the media A 361 and media B 362 below the application 300 and information from the file system 310 are used. A device driver 350 that controls B362 is shown. In the example shown in FIG. 11, two media A361 and media B362 are shown. For example, a hard disk whose logical sector unit and physical sector unit described with reference to FIG. 1 and the like do not match, and other recording media such as a flash memory. The device driver 350 includes device drivers 351 and 352 corresponding to media A361 and media B362 that are recording devices.

  The application 300, the file system 310, and the device driver 350 access and use the memory 370 as a work area for storing programs and parameters necessary for processing of each component and data processing. For example, the areas of the (M1) first memory and the (M2) RMW memory (buffer) described with reference to FIGS. 6 and 8 are set in the memory 370. The memory 370 is preferably a non-volatile flash memory.

  The application 300 includes a recording application 301 that executes data recording processing on the media A 361 and the media B 362, a playback application 302 that executes playback processing of data recorded on the media A 361 and B 362, and a USB connection that executes processing by the connected device. Applications corresponding to processing such as the application 303 are included. The user selects these applications and executes various processes.

  The file system 310 holds mount drive information 311 and 312 corresponding to each storage medium including the type and format information of the recording medium, and data recording using an information recording medium such as a hard disk according to the mount drive information 311 and 312. Perform playback control. The file system 310 includes a recording / playback control unit 320 that executes data recording / playback control, and a media control unit 330 that executes media control. The processing executed by the recording / playback control unit 320 is media-independent media common processing, and the processing executed by the media control unit 330 is media-dependent processing.

  The recording / playback control unit 320 includes a FAT control unit 321 that performs file allocation table (FAT) recording and reference processing, a cluster determination process as data recording position information, and a cluster that performs a playback position determination process based on the cluster number. It has a control unit 322 and a directory entry control unit 323 that executes a process for generating or referring to a directory entry (see FIG. 3) that stores information corresponding to a file. The directory entry control unit 323 acquires a directory entry corresponding to a specific file based on storage means and file designation information from the application 300. For example, in the case of file reproduction, the directory entry control unit 323 acquires a head cluster number from the directory entry. This is provided to the control unit 322.

  The media control unit 330 has a position calculation unit 331, controls the device driver 350 based on the cluster information determined by the cluster control unit 322 and the cluster linkage information of FAT, and performs data recording or data reproduction according to the cluster number. The position of the disk to be executed is determined, and data recording or data reproduction from the disk position is executed via the device driver 350 according to the determined position information.

  An access control unit 340 in the file system 310 controls access to storage means according to the application. The access control unit 340 executes access control according to each process in both the media control unit 330 that executes media-independent media common processing and the media control unit 330 that executes media-dependent processing. To do. The device drivers 351 and 352 also have access control units 353 and 354, respectively, and execute the access control process including the RMW process described above under the control of at least one of these access control units.

  Media A361 and Media B362, which are recording media, include media correspondence control units 363 and 364 that execute data recording processing and playback processing on the media. For example, media correspondence control of the media A361 configured by a hard disk is performed. The unit 363 executes data access to the hard disk in units of physical sectors.

  Next, a file system activation process and a device driver activation process sequence executed in the information processing apparatus according to the embodiment of the present invention will be described with reference to FIGS.

  The activation process is a process executed when the information processing apparatus is activated. First, FIG. 12 is a flowchart for explaining a file system activation process. First, as initialization process 1, for example, the type of the loaded medium is determined, and the format information of the determined medium is acquired (step S101). Next, the access control information recorded in advance in the nonvolatile memory is held in a memory area accessible by the file system (for example, a part of the RAM shown in FIG. 11) (step S102).

  As shown in FIG. 12, the access control information recorded in advance in the non-volatile memory is the phase conversion point X and the number of logical sectors N included in one physical sector described earlier with reference to FIG. . Next, as an initialization process 2, a final process for waiting for a command input from the upper application is executed (step S103). Thereafter, a command from the application is input, and processing according to the input can be executed.

  Next, device driver activation processing will be described with reference to FIG. First, as the initialization process 1, for example, the type of the loaded medium is determined and the format information of the determined medium is acquired (step S121). Next, an RMW buffer is secured based on the value of the number of logical sectors N included in one physical sector included in the access control information received from the file system, and further included in the phase conversion point X and one physical sector. The value of the number of logical sectors N is held in a memory area accessible by the device driver (for example, a part of the RAM shown in FIG. 11) (step S122).

  Next, as initialization processing 2, final processing for waiting for a command input from a higher-level application is executed (step S123). Thereafter, a command from the application is input, and processing according to the input can be executed.

  Here, with reference to FIG. 2, consider a case where a device driver issues a write request to a recording medium (HDD) by designating write start LBA = 77 and the number of write sectors = 1. When such a write request is made, RMW processing is performed on the HDD. When such a write request is issued, the updated contents of LBA = 77 to 78 are written as the contents of new physical sector = 39, regardless of whether they are processed by the device driver or inside the HDD. .

  FIG. 14 is an explanatory diagram showing the relationship between data and ECC in a physical sector. Each physical sector has an area for recording data and an area for recording ECC. For example, if the power is cut off or the medium is removed while the physical sector = 39 is being recorded, ECC is not recorded in the sector. As a result, not only the LBA = 77 data for which the write request has been made, but also the LBA = 78 data outside the write request range will be lost.

  Therefore, in the present embodiment, when the RMW process is performed, the contents to be recorded are backed up to a storage device different from the recording medium to be recorded, so that the power is cut off or the medium is removed. Even in such a case, data loss is prevented.

  FIG. 15 is a flowchart for explaining processing for backing up the contents to be recorded according to an embodiment of the present invention. First, the device driver 350 is instructed to write to the medium (step S131). For example, the device driver 350 is instructed to write data to the medium A361. Then, the device driver 350 determines whether the area of the medium A361 for which writing has been instructed is an area where RMW processing occurs during recording (step S132).

  Whether the RMW is generated or not can be determined from the number N of logical sectors included in one physical sector and the phase conversion point X. When the number N of logical sectors included in one physical sector is N = 2 and the phase conversion point X is X = 61, when a write request is issued with the specification of write start LBA = 77 and the number of write sectors = 1 RMW processing occurs during recording.

  If it is an area where RMW processing occurs, the contents to be written to the medium A361 are backed up to a storage device other than the medium A361 in units of physical sectors (step S133). In the present embodiment, the content to be written to the media A 361 is recorded in the memory 370. Then, the contents to be written are actually written to the medium A361 (step S134). As a result of the determination in step S132, if it is determined that the area does not generate an RMW process, the process proceeds to step S134 as it is, and the content to be written is actually written in the medium A361.

  As described above, when data is recorded on the recording medium in the area where the RMW processing occurs, by backing up in units of physical sectors, the power is shut off or the medium is removed during recording on the recording medium. Thus, even when the data to be written on the recording medium cannot be normally recorded, the destruction and erasure of the data can be prevented.

  FIG. 16 is an explanatory diagram illustrating an example of a data structure of a backup destination storage device according to the embodiment of this invention. In FIG. 16, a case where data is backed up to a memory 370 using a flash memory will be described as an example.

  In the example shown in FIG. 16, backup data is recorded from an erase block whose erase block logical number is N in the memory 370. The memory 370 records the backup source LBA number and the backup destination LBA number. The backup source LBA number records the LBA number of a recording medium (for example, HDD) that is a data recording target, and the backup destination LBA number records the LBA number of the memory 370.

  Then, the data to be actually backed up is recorded from the area of the memory 370 designated by the backup destination LBA number. If recorded in this way, backup data can be acquired by referring to the LBA number of the backup destination.

  FIG. 17 is a flowchart illustrating a method for reading backup data from the memory 370 (flash memory) in an embodiment of the present invention. First, the device driver 350 is instructed to read from the medium A361 (step S141). Here, it is assumed that a read request from the medium A361 is issued by designating the read start LBA = 77 and the number of read sectors = 1 to the device driver 350.

  Next, it is determined whether data reading from the designated area has failed (step S142). If it does not fail, reading of data from the designated area ends normally. On the other hand, when reading of data from the designated area fails, it is confirmed whether or not valid backup data exists in the memory 370 (step S143).

  If valid backup data exists in the memory 370, the backup data is read from the memory 370 (step S144), and the process ends normally. On the other hand, if valid backup data does not exist in the memory 370, the process ends in error.

  In this way, by backing up the data to be recorded on the medium A361 in the memory 370, the backup data can be read from the memory 370 even if the data reading from the medium A361 fails, the data Can be prevented from being destroyed or lost.

  Note that after the backup data is read from the memory 370, the device driver 350 may write the backup data back to the area of the medium A361 designated to be read. By writing the backup data back to the medium A361, the next time the reading of the area is attempted, the data can be read from the medium A361 without failing to read the data.

  Next, as a configuration example of an information processing apparatus that performs the above-described processing, a configuration example of a digital video camera and a PC will be described with reference to FIGS.

  First, a configuration example of a digital video camera will be described with reference to FIG. The digital video camera captures an image and records image data obtained by capturing the image on various information recording media such as a magnetic disk, an optical disk, a magneto-optical disk, and a semiconductor memory via the drive 432, and A VTR mode for recording data supplied through the image input / output unit 414, the audio input / output unit 416, or the communication unit 431 on a recording medium, and reproducing the data recorded on the recording medium. is there.

  The imaging mode includes a moving image imaging mode in which a moving image is captured and simultaneously recorded sound is recorded on a recording medium, and a still image imaging mode in which a still image is captured. In the VTR mode, the supplied data is recorded by operating the operation input unit 420 including a recording button switch, and the recording is performed on the recording medium by operating the playback button switch. The target data can be reproduced.

  As shown in FIG. 18, the digital video camera includes an optical lens unit 411, a photoelectric conversion unit 412, a camera function control unit 402, an image signal processing unit 413, an image input / output unit 414, a liquid crystal display 415, an audio input / output unit 416, Audio processing unit 417, communication unit 431, control unit (CPU) 401, built-in memory (RAM) 418, built-in memory (ROM) 419, operation input unit 420, drive 432 for information recording medium, and power supply to each component A power source 441 is provided.

  A control unit (CPU) 401 executes processing according to various processing programs stored in the ROM 419. The RAM 418 is mainly used as a work area such as temporarily storing intermediate results in each process. The (M1) first memory, (M2) RMW memory, etc. described with reference to FIGS. 6 and 8 are set.

  The operation input unit 420 includes a mode switching key for switching operation modes such as a moving image shooting mode, a still image shooting mode, and a VTR mode, a shutter key for shooting a still image, a shooting start key for shooting a movie, a recording key, Various operation keys and function keys such as a reproduction key, a stop key, a fast-forward key, and a fast-rewind key are provided, and an operation input from the user is received and an electric signal corresponding to the received operation input is transmitted to the control unit (CPU) 401. To supply.

  A control unit (CPU) 401 reads out and executes a program for performing a target process from the ROM 419 in response to an operation input from the user, and controls each unit to perform a process according to an instruction from the user. Take control. The digital video camera can mount various information recording media such as a magnetic disk, an optical disk, a magneto-optical disk, and a semiconductor memory as an information recording medium, and record various information on these information recording media via a drive 432. Also, the information recorded on these information recording media is reproduced. A hard disk as a magnetic disk has the settings described above with reference to FIG.

  Next, a hardware configuration example of a PC as an example of an information processing apparatus that performs the above-described processing will be described with reference to FIG. The CPU 501 functions as a data processing unit that executes processing corresponding to an OS (Operating System), data recording, or data reproduction processing described in the above-described embodiments. These processes are executed according to a computer program stored in a data storage unit such as a ROM or a hard disk of the information processing apparatus.

  The ROM 502 stores programs used by the CPU 501, calculation parameters, and the like. The RAM 503 is set with a program used in the execution of the CPU 501, parameters that change as appropriate in the execution, (M1) first memory, (M2) RMW memory described with reference to FIGS. 6 and 8 described above, and the like. The These are connected to each other by a host bus 504 including a CPU bus. Also in the management information recording process described above, data update or the like is executed using the RAM 503 as a work area.

  The host bus 504 is connected via a bridge 505 to an external bus 506 such as a PCI (Peripheral Component Interconnect / Interface) bus. A keyboard 508 and a pointing device 509 are input devices operated by the user. The display 510 includes a liquid crystal display device, a CRT (Cathode Ray Tube), or the like, and displays various types of information as text and images.

  The drive 512 reads data or a program recorded on a removable recording medium 521 such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory, and the data or program is read out from the interface 507 and the external bus 506. , And supplied to the RAM 503 connected via the bridge 505 and the host bus 504.

  The connection port 514 is a port for connecting the external connection device 522 and has a connection unit such as USB or IEEE1394. The connection port 514 is connected to the CPU 501 and the like via the interface 507, the external bus 506, the bridge 505, the host bus 504, and the like. The communication unit 515 is connected to a network and executes communication with other information processing apparatuses.

  Note that the configuration examples of the information processing apparatus illustrated in FIGS. 18 and 19 are examples of the apparatus, and the information processing apparatus is not limited to the configurations illustrated in FIGS. Any configuration is possible.

  The present invention is not limited to HDDs (hard disk drives), and can be applied to all randomly accessible media having properties corresponding to the number of logical sectors N and the phase conversion point X included in one physical sector. As an example of the file system, it can be used in other file systems such as FAT16 / 32. Also, it can be applied to removable media in the same manner as media built in the main body.

  The series of processing described in the specification can be executed by hardware, software, or a combined configuration of both. When executing processing by software, the program recording the processing sequence is installed in a memory in a computer incorporated in dedicated hardware and executed, or the program is executed on a general-purpose computer capable of executing various processing. It can be installed and run. For example, the program can be recorded in advance on a recording medium. In addition to being installed on a computer from a recording medium, the program can be received via a network such as a LAN (Local Area Network) or the Internet, and installed on a recording medium such as a built-in hard disk.

  As described above, according to an embodiment of the present invention, data outside the write request range is not destroyed when the LBA access unit does not match the management data unit in the recording medium (for example, HDD). In addition, once the data to be written is stored in a storage device (for example, RAM) different from the recording medium, the backup is recorded on the recording medium, so that the destruction and disappearance of the data can be prevented. In addition, once the data to be written is stored in a storage device different from the recording medium, the backup data can be read even if the recording medium is destroyed or lost. Data can be read and data can be recovered by writing the read data back to the recording medium.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to the example which concerns. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  INDUSTRIAL APPLICABILITY The present invention is applicable to an information processing apparatus and an information processing method, and in particular, in a configuration for performing data recording / playback processing using a hard disk or the like as a recording medium, The present invention can be applied to an information processing apparatus and an information processing method applied in a system in which a data unit managed in the medium is different.

It is explanatory drawing explaining the example of a response | compatibility with the logical sector (LBA) which is an access unit of a device driver, and the physical sector which is a media, ie, HDD access unit. It is explanatory drawing explaining the problem in the access process in case the logical sector which is an access unit of an upper layer differs from the physical sector which is a media access unit. It is explanatory drawing explaining the problem in the access process in case the logical sector which is an access unit of an upper layer differs from the physical sector which is a media access unit. It is explanatory drawing explaining a RMW process and its necessity. It is explanatory drawing explaining the necessity determination process of a RMW process. It is explanatory drawing explaining the specific example of a RMW process. It is a flowchart explaining the process sequence of RWM process. It is explanatory drawing explaining the specific example of a RMW process. It is a flowchart explaining the process sequence of RMW process. It is explanatory drawing explaining the system configuration | structure of the information processing apparatus which concerns on one Embodiment of this invention. It is explanatory drawing explaining the system configuration | structure of the information processing apparatus which concerns on one Embodiment of this invention. It is a flowchart explaining the file system starting process in the information processing apparatus which concerns on one Embodiment of this invention. It is a flowchart explaining the device driver starting process in the information processing apparatus which concerns on one Embodiment of this invention. It is explanatory drawing which shows the relationship between the data and ECC in a physical sector. It is a flowchart explaining the process which backs up the content which is going to record based on one Embodiment of this invention. It is explanatory drawing which shows an example of the data structure of the backup destination memory | storage device in one Embodiment of this invention. 6 is a flowchart illustrating a method for reading backup data from a storage device (flash memory) in an embodiment of the present invention. It is explanatory drawing explaining the structural example of a digital video camera. It is explanatory drawing explaining the hardware structural example of PC as an example of the information processing apparatus of this invention.

Explanation of symbols

281 Application 282 File system 283 Device driver 284 Information recording medium 300 Application 301 Recording application 302 Playback application 303 USB connection application 310 File system 311, 312 Mount drive information 320 Recording / playback control unit 321 FAT control unit 322 Cluster control unit 323 Directory entry control Unit 330 Media control unit 331 Position calculation unit 340 Access control unit 350, 351, 352 Device driver 353, 354 Access control unit 361 Media A
362 Media B
363, 364 Media compatible control unit 370 Memory 401 Control unit (CPU)
402 Camera Function Control Unit 411 Optical Lens Unit 412 Photoelectric Conversion Unit 413 Image Signal Processing Unit 414 Image Input / Output Unit 415 Liquid Crystal Display 416 Audio Input / Output Unit 417 Audio Processing Unit 418 Built-in Memory (RAM)
419 Internal memory (ROM)
420 Operation Input Unit 431 Communication Unit 432 Drive 441 Power Supply 501 CPU
502 ROM
503 RAM
504 Host bus 505 Bridge 506 External bus 507 Interface 508 Keyboard 509 Pointing device 510 Display 511 HDD
512 drive 514 connection port 515 communication unit 521 removable recording medium 522 external connection device

Claims (4)

An information processing apparatus for recording data on a recording medium,
An access control unit that controls recording of recording data to the recording medium and reading of the recording data from the recording medium;
A recording data storage unit for temporarily storing recording data to be output to the recording medium as backup data;
Including
The access control unit
Whether or not the recording start position and / or the recording end position of the recording data input to the recording medium in logical sector units is different from the physical sector division position that is an access unit to the recording medium. When different from the division position of the physical sector, the recording data to be recorded on the recording medium is stored in the recording data storage unit, and when the storage is completed, the recording data is output to the recording medium, Information processing device.   The access control unit checks whether valid backup data exists in the recording data storage unit when an error occurs when reading the recording data from the recording medium. The information processing apparatus according to 1.   The information processing apparatus according to claim 2, wherein, when valid backup data exists, the access control unit outputs the backup data to an original storage position of the recording medium. An information processing method for recording data on a recording medium,
An access control step for controlling recording of the recording data to the recording medium and reading of the recording data from the recording medium;
A recording data storing step for temporarily storing recording data to be output to the recording medium as backup data;
Including
The access control step includes
A verification step of verifying whether a recording start position and / or a recording end position of recording data input to the recording medium in units of logical sectors is different from a physical sector division position that is an access unit to the recording medium;
A storage step of storing recording data to be recorded on the recording medium in the recording data storage unit when the verification result of the verification step is different from the physical sector division position;
An output step of outputting the recording data to a recording medium when the storage is completed;
An information processing method comprising:

Images