JP2008250918A - Information processor, information processing method and computer program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain an improved data recording configuration in a recording device having a difference in data classification between a logic sector and a physical sector. <P>SOLUTION: In an access control part, a device information acquisition result is outputted to a medium correspondence control part which executes data recording to a medium, device information such as logic sector number [N] contained in one physical sector or phase change point [X] is received, it is verified based on the received information whether a recording start position or recording end position of recording data input in logic sector units from an application is differed from a classification position of physical sector that is an access unit to a medium managed by the medium correspondence control part or not, and read-modify-write (RMW) processing is executed according to the verification result. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an information processing apparatus, an information processing method, and a computer program. More specifically, for example, in a configuration in which data recording / reproduction processing is performed using a hard disk or the like as a recording medium, a data unit as an access unit used by an application or a device driver and a data unit managed in a recording medium (such as an HDD) The present invention relates to an information processing apparatus, an information processing method, and a computer program applied in different systems.

  In digital video cameras, PCs, and other information processing devices, information recording and information reproduction processing using a medium (information recording medium) such as a hard disk is performed. When performing information recording or information reproduction processing using a medium (information recording medium), the application generates recording data or designates reproduction data, and the medium via a device driver corresponding to the medium (information recording medium) Recording data is output to (information recording medium) or reproduction data is input from the medium (information recording medium).

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

  Specifically, for example, as an access unit inside the HDD, there is one that uses a physical sector (Physical Sector) in which N logical sectors (Logical Sector) are grouped together. By increasing the management unit inside the HDD, there is an effect that, for example, the ECC (Error Correction Code) setting unit is increased to increase the processing efficiency, and the storage area can be efficiently used by reducing the ECC data.

  As described above, the data access unit of the upper layer (application or device driver) and the data access unit of the control unit in the medium (information recording medium) are different, and the access unit in the medium is set larger than the access unit of the upper layer. If, for example, a certain data recording or playback area is designated for the medium from the upper layer, the designated area and the data area managed collectively are also read and recorded collectively in the medium. Will be executed.

  For example, when an application reads and updates data recorded on a medium, the update process on the application side is executed in units of logical sectors. However, in the medium (for example, inside the HDD), the medium temporarily includes the sector data to be updated. The data is read in units of access, that is, in units of physical sectors, temporarily stored in the memory inside the 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 medium. The updated data in the logical sector is replaced with data updated by the application and recorded in a spare area which is an emergency data recording area of the medium, for example. However, for non-updated sector data included in the same physical sector as the updated logical sector, dummy data temporarily stored in the internal memory of the medium is recorded in the spare area as it is due to a read error that occurs inside the medium. As a result, a situation similar to that when the non-updated data is lost occurs. In this case, the upper application or device driver cannot detect data loss at all.

In a semiconductor memory or the like, garbage collection, that is, processing for securing a memory area is performed when there is a recorded cluster behind a cluster to be written in the same erase block. 1 (Japanese Patent Laid-Open No. 2003-308240) discloses a device for arranging various types of information on a medium so that such garbage collection does not occur frequently. However, for example, in a recording medium such as an HDD, it is practically difficult to control the layout of information related to a file system such as FAT.
JP 2003-308240 A

  The present invention has been made in view of the above-described situation. For example, in a system for performing data recording / playback processing using a hard disk or the like, an access unit used by an application or a device driver and management inside a recording medium (HDD or the like). Even if there is a difference from the unit, for example, by controlling the recording data based on the device information acquired by the access control unit of the device driver, it is possible to detect the occurrence of data loss in the upper layer and prevent unexpected data loss. An object is to provide an information processing apparatus, an information processing method, and a computer program.

The first aspect of the present invention is:
An information processing apparatus that executes data recording processing on a recording medium,
An access control unit that outputs recording data for a recording medium input from an application that generates recording data in units of logical sectors to the media correspondence control unit;
A media correspondence control unit that inputs the recording data from the access control unit and executes a data recording process on a recording medium in a physical sector unit different from the logical sector;
The access control unit
Output a device information acquisition request to the media correspondence control unit, and acquire the number of logical sectors [N] included in one physical sector as a response corresponding to the device information acquisition request from the media correspondence control unit,
Physical sector classification in which the recording start position or recording end position of recording data input in logical sector units from the application by applying the acquisition information [N] is an access unit for media managed by the media correspondence control unit It is verified whether or not it is different from the position, and if it is different, the recording data for each physical sector is obtained via the media correspondence control unit and stored in the memory, and a part of the stored physical sector data is stored in the logical sector data. An information processing apparatus that is configured to execute read-modify-write (RMW) processing in which update is performed by recording data in units of sectors input from an application, and physical sector data after update processing is output to the media correspondence control unit. It is in.

  Furthermore, in one embodiment of the information processing apparatus of the present invention, the access control unit outputs an IDENTIFY Device command as a device information acquisition request to the media support control unit, and responds to the command from the media support control unit. As a return value, the number of logical sectors [N] information included in one physical sector is acquired.

  Furthermore, in one embodiment of the information processing apparatus of the present invention, the access control unit further includes a phase change of a correspondence relationship between the logical sector and the physical sector as a response corresponding to the device information acquisition request from the media correspondence control unit. Phase conversion point [X] information is generated, and the acquired phase conversion point [X] information is applied, and the recording start position or recording end position of recording data input in units of logical sectors from the application is The present invention is characterized in that a process for verifying whether or not the position differs from a physical sector division position, which is a unit of access to the media managed by the media control unit, is provided.

  Furthermore, in one embodiment of the information processing apparatus of the present invention, the access control unit further acquires and acquires the sector size information of the logical sector as a response corresponding to the device information acquisition request from the media support control unit. Whether the recording start position or recording end position of the recording data input from the application in logical sector units by applying sector size information is different from the physical sector division position that is an access unit to the media managed by the media control unit It is the structure which performs the process which verifies whether or not.

  Furthermore, in an embodiment of the information processing apparatus of the present invention, the access control unit stores a first memory area for storing recording data input in units of logical sectors from the application in the execution of the read modify write (RMW) process. From the above, the read modify write (RMW) memory area is configured to execute a copy process of the logical sector data to be subjected to the read modify write (RMW) process.

  Furthermore, in an embodiment of the information processing apparatus according to the present invention, the access control unit, as a management information list corresponding to the recording data, records a logical block address corresponding to the recording data when recording the recording data input from the application. (LBA), a sector count that is the number of sectors of recording data, and a write list that records offset information that is offset information of a logical sector number are generated, and a recording process that refers to the write list is performed.

  Furthermore, in one embodiment of the information processing apparatus of the present invention, the access control unit further includes a phase conversion point [X] at which a phase change of a correspondence relationship between a logical sector and a physical sector occurs, and the application When the recording data input in units of logical sectors is data before and after the phase conversion point [X], the first writing list for the recording data before the phase conversion point [X] and after the phase conversion point [X] It is the structure which performs the process which produces | generates the 2nd writing list with respect to this recording data.

Furthermore, the second aspect of the present invention provides
An information processing method for performing a data recording process on a recording medium in an information processing device,
An access control unit that outputs recording data for a recording medium input from an application that generates recording data in units of logical sectors to the media corresponding control unit;
A media correspondence control unit having the media correspondence control step of inputting the recording data from the access control unit and executing a data recording process on the recording medium in a physical sector unit different from the logical sector;
The access control step includes
Device information acquisition that outputs a device information acquisition request to the media correspondence control unit and acquires the number of logical sectors [N] contained in one physical sector as a response to the device information acquisition request from the media correspondence control unit Steps,
Physical sector classification in which the recording start position or recording end position of recording data input in logical sector units from the application by applying the acquisition information [N] is an access unit for media managed by the media correspondence control unit A verification step for verifying whether it is different from the position;
In the verification step, if a verification result that is different is obtained, recording data in units of physical sectors is obtained via the media correspondence control unit, stored in the memory, and some logical sectors of the stored physical sector data A read-modify-write (RMW) processing step for executing a read-modify-write (RMW) process in which data is updated with recording data in units of sectors input from an application, and the physical sector data after the update process is output to the media correspondence control unit; ,
There is an information processing method characterized by being a step of executing.

  Furthermore, in one embodiment of the information processing method of the present invention, the device information acquisition step outputs an IDENTIFY Device command as a device information acquisition request to the media correspondence control unit, and the media correspondence control unit sends the command to the command. As a corresponding return value, it is a step of acquiring the number [N] of logical sectors included in one physical sector.

  Furthermore, in one embodiment of the information processing method of the present invention, the device information acquisition step further includes a phase of a correspondence relationship between the logical sector and the physical sector as a response corresponding to the device information acquisition request from the media correspondence control unit. The phase conversion point [X] information where the change occurs is acquired, and the verification step applies the acquired phase conversion point [X] information and records recording data input in units of logical sectors from the application. It is a step of executing a process of verifying whether or not the start position or the recording end position is different from a physical sector division position that is an access unit for the medium managed by the media control unit.

  Furthermore, in one embodiment of the information processing method of the present invention, the device information acquisition step further includes a step of acquiring sector size information of a logical sector as a response corresponding to the device information acquisition request from the media support control unit. In the verification step, the acquired sector size information is applied, and the recording start position or recording end position of the recording data input from the application in logical sector units is an access unit for the medium managed by the media control unit. It is a step for executing a process of verifying whether or not a physical sector is different from a divided position.

  Furthermore, in an embodiment of the information processing method of the present invention, the access control step stores a first memory area for storing recording data input in units of logical sectors from the application in the execution of the read-modify-write (RMW) process. From the above, a copy process of logical sector data to be read-modify-write (RMW) processing target is executed for the read-modify-write (RMW) memory area.

  Furthermore, in an embodiment of the information processing method of the present invention, the access control step includes a logical block address corresponding to the recording data as a management information list corresponding to the recording data when recording the recording data input from the application. (LBA), a sector count that is the number of sectors of recording data, and a writing list that records offset information that is offset information of a logical sector number are generated, and recording processing is performed with reference to the writing list.

  Furthermore, in an embodiment of the information processing method of the present invention, the access control step further includes a phase conversion point [X] at which a phase change of a correspondence relationship between a logical sector and a physical sector occurs, and from the application When the recording data input in units of logical sectors is data before and after the phase conversion point [X], the first writing list for the recording data before the phase conversion point [X] and after the phase conversion point [X] A process for generating a second writing list for the recorded data is executed.

Furthermore, the third aspect of the present invention provides
In the information processing apparatus, a computer program for executing a data recording process on a recording medium,
An access control step for causing the access control unit to output recording data for a recording medium input from an application that generates recording data in units of logical sectors, to the media correspondence control unit;
A media correspondence control step of inputting the recording data from the access control unit to the media correspondence control unit, and executing a data recording process on the recording medium in a physical sector unit different from the logical sector;
The access control step includes
A device information acquisition request for outputting a device information acquisition request to the media correspondence control unit and acquiring the number of logical sectors [N] contained in one physical sector as a response corresponding to the device information acquisition request from the media correspondence control unit Steps,
Physical sector classification in which the recording start position or recording end position of recording data input in logical sector units from the application by applying the acquisition information [N] is an access unit for media managed by the media correspondence control unit A verification step for verifying whether it is different from the position;
In the verification step, if a verification result that is different is obtained, recording data in units of physical sectors is obtained via the media correspondence control unit, stored in the memory, and some logical sectors of the stored physical sector data A read-modify-write (RMW) processing step for executing a read-modify-write (RMW) process for updating data with recording data in units of sectors input from an application and outputting the updated physical sector data to the media correspondence control unit; ,
There is a computer program characterized by the step of executing

  The computer program of the present invention is a computer program that can be provided by, for example, a storage medium provided in a computer-readable format in a general-purpose computer system that can execute various program codes. By providing such a program in a computer-readable format, processing corresponding to the program is realized on the computer system.

  Other objects, features, and advantages of the present invention will become apparent from a more detailed description based on embodiments of the present invention described later and the accompanying drawings. In this specification, the system is a logical set configuration of a plurality of devices, and is not limited to one in which the devices of each configuration are in the same casing.

  According to the configuration of one embodiment of the present invention, in an access control unit of an information processing apparatus that performs data recording processing on a recording medium (information recording medium), a device information acquisition request is sent to the media corresponding control unit that performs data recording on the medium IDENTIFY Device command is output, device information such as the number of logical sectors [N] and phase change point [X] included in one physical sector is received, and the logical sector unit is received from the application based on the received information. It is verified whether or not the recording start position or recording end position of the input recording data is different from the physical sector division position that is an access unit for the medium managed by the media correspondence control unit. The recording data in physical sector units via the The logical sector data that is part of the physical sector data is updated with the recording data in units of sectors input from the application, and the read-modify-write (RMW) process is executed to output the updated physical sector data to the media corresponding control unit. Since it is configured, data input / output in units of physical sectors is realized between the device driver and the media compatible control unit, and logical sector data without data update can be confirmed on the device driver side. The occurrence of unforeseen circumstances such as disappearance can be grasped in the upper layer.

Details of the information processing apparatus, the information processing method, and the computer program of the present invention will be described below with reference to the drawings. The description will be made according to the following items.
1. 1. Problems based on the difference between access units of upper layers (applications and device drivers) and access units of media (information recording media) 2. Outline of access processing of media (information recording medium) according to the present invention 3. Configuration example and processing example of information processing apparatus 4. Details of sequence of processing executed by information processing apparatus Hardware configuration example of information processing device

[1. Problems based on the difference between the upper layer (application and device driver) access unit and the media (information recording medium) access unit]
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 medium (information recording medium) will be described with reference to FIGS.

In the examples below,
Media access from higher layers (applications and device drivers) is executed in units of 512 B (bytes) LBA (Logical Blobk Addressing) designation, that is, in units of logical sectors (Logical Sector),
An example in which an access unit in a medium (information recording medium) such as an HDD 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 shows 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 medium, that is, an 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 of logical sectors included in one physical sector is N = 2.

N is
N = (physical sector) / (logical sector)
And means “the number of logical sectors that are actually managed as a whole in 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, “LBA whose phase changes”, and the logical sector (LBA) at this phase change point is [X]. In the example shown in FIG. 1, X = 61.

In the region of LBA = 0 to X-1,
Physical sector number = logical sector number (LBA) × M ÷ N (M ≧ 0)
Is established,
In the region of LBA = X to MAX, the relationship does not hold,
For example, as shown in the figure, when the number of logical sectors included in one physical sector: N = 2,
Physical sector number = (logical sector number (LBA) +1) × M ÷ N (M ≧ 0)
It becomes the relationship.

  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 reading from the medium or data writing to the medium is executed in units of physical sectors in the HDD.

In addition, FIG.
Phase change point: X = 61
In the area from LBA = 0 to 60, even addresses (0, 2, 4, 6...) Of the LBA are aligned with the top of the physical sector, but the area after LBA = 61. In this case, the odd addresses (61, 63, 65...) Of the LBA are aligned with the head of the physical sector.

With reference to FIG. 2 and FIG.
Access unit of upper layer (application or device driver) = (logical sector (LBA)),
Media (information recording medium) access unit = physical sector,
A problem in access processing when these are different will be described.

In FIG. 2, as in FIG.
Number of logical sectors included in one physical sector: N = 2
Phase conversion point: X = 61
A part corresponding to the sector having X and N is shown.

The device driver
Write start LBA = 77,
Number of write sectors = 1
When the write request is issued by designating, the data write process to the hard disk is executed in the HDD as shown in FIG.

(Step S11)
The contents of LBA = 77 to 78 of physical sector number = 39 are read into the HDD internal buffer.
(Step S12)
Data of LBA = 77 is updated in the HDD internal buffer, and this updated data is supplied from the upper device driver.
(Step S13)
The updated contents of LBA = 77 to 78 are written as the contents of physical sector number = 39. By such a process, update data is recorded. As understood from this processing, the data of LBA = 78 is simply read into the HDD internal buffer inside the HDD and rewritten.

With reference to FIG. 3, problems in the processing example of FIG. 2 will be described. FIG. 3 is a process in the case where 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 process 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.
(Step S21)
The contents of LBA = 77 to 78 of physical sector number = 39 are read into the HDD internal buffer. It is assumed that the reading process has failed at this point.
(Step S22)
Due to a read error, dummy data corresponding to LBA = 77 to 78 of physical sector number = 39 is set in the HDD internal buffer, and data of LBA = 77 is updated with respect to this dummy data. This update data is supplied from a higher-level device driver.
(Step S13)
The updated contents of LBA = 77 to 78 are used as the contents of physical sector number = 39, and data is written to a spare area (alternate sector) that is an area used when a read error occurs.

When data is updated in the above sequence, the data written to the spare area (alternate sector)
LBA = 77: Update data provided from the device driver,
LBA = 78: 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.

[2. Access processing of media (information recording medium) according to the present invention]
The information processing apparatus according to the present invention proposes a configuration that prevents the occurrence of the situation described with reference to FIG. Hereinafter, processing examples of the present invention will be described.

  In order to avoid the situation shown in FIG. 3, the information processing apparatus according to the present invention writes data in an upper layer, for example, an application or a device driver while paying attention to at least the number of logical sectors included in one physical sector: N. Issue a request. Note that in a system having a phase change point, it is preferable to perform processing in consideration of the phase change point: X.

  The process for issuing a write request to a medium such as an HDD executed by the device driver is executed as a process for issuing a write request in consideration of the number of logical sectors included in at least one physical sector: N. Specifically, it is determined whether or not processing requiring data reading, updating, and rewriting processing from the medium to the internal buffer of the recording medium occurs, and a write request is made.

  The data read, update, and rewrite processing from the medium to the internal buffer of the recording medium is a process shown in the flow of FIGS. 2 and 3, and is called a read-modify-write (RMW) process. When this read-modify-write processing occurs, the data read data from the medium to the internal buffer of the recording medium is written 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, Data read, update, and rewrite processes are executed.

  A specific processing example will be described with reference to FIG. Read-modify-write (RMW) processing 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 a physical sector that is an access unit of a recording medium (such as an HDD). To do. That is, in this case, the data read data from the medium to the internal buffer of the recording medium is written into the memory area accessible by the device driver itself (buffer area corresponding to the device driver), and the memory area accessible by the device driver is written. Data read, update, and rewrite processes are executed in units of physical sectors.

  4A to 4C are diagrams for explaining the necessity of a read-modify-write (RMW) process according to the data access mode of the device driver.

  FIG. 4A is an example in which both of the two boundaries 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 (such as HDD). In this case, read-modify-write (RMW: Read-Modify-Write) processing is not required.

FIG. 4B is an example in which one of the two boundaries of the data access start position and the end position of the device driver does not match the boundary of the physical sector that is the access unit of the recording medium (HDD or the like). In this case, read-modify-write (RMW: Read-Modify-Write) processing is required.
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 (HDD or the like). In this case, the data access start position Read-modify-write (RMW) processing for one physical sector including the logical sector number before the logical sector number 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 (HDD or the like). In this case, the data access end position Read-modify-write (RMW) processing for one physical sector including the logical sector number after the logical sector number is required.

  FIG. 4C is 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 (HDD or the like). In this case, 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 number including the logical sector number after the logical sector number at the data access end position. A read-modify-write (RMW) process for a physical sector is required.

  FIG. 5 is a table showing whether or not the read-modify-write process according to each writing mode of FIGS. 4A to 4C is 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. b) or (C) is determined to determine whether or not RMW (reed modify write) is necessary, and if necessary, RMW (reed modify write) is executed.

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. In addition, the device driver
Write end LBA = write start LBA + number of write sectors−1
As a result, the write end LBA is calculated.

further,
Number of logical sectors included in one physical sector: N
Phase conversion point: X
By inputting these parameters, 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
Write start LBA,
Number of write sectors,
Number of logical sectors included in one physical sector: N
Phase conversion point: X
Based on these data,
Write end LBA = write start LBA + number of write sectors−1
As described above, the write end LBA is calculated, and RMW necessity determination processing according to the above algorithm is executed. When RMW (read modify write) is required by this determination processing, read modify write (read, write, update, and rewrite processing including data read, update, and rewrite processing from the medium in units of physical sectors in a memory (buffer) accessible by the device driver. RMW) processing is executed.

  Specific processing examples in the cases (A), (Ba), (BB), and (C) shown in FIGS. 4 and 5 will be described. FIG. 4A is an example in which both of the two boundaries 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 (such as HDD). In this case, read-modify-write (RMW: Read-Modify-Write) processing is not required.

FIG. 4B is an example in which one of the two boundaries of the data access start position and the end position of the device driver does not match the boundary of the physical sector that is the access unit of the recording medium (HDD or the like). In this case, read-modify-write (RMW: Read-Modify-Write) processing is required.
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 (HDD or the like). In this case, the data access start position Read-modify-write (RMW) processing for one physical sector including the logical sector number before the logical sector number is required.

  The data recording process including the read modify write process in the case (Ba) will be described with reference to FIGS. FIG. 6 (1) is the same diagram as FIG. 4 (B-a), and read-modify-write (one for the physical sector including the logical sector number preceding the logical sector number corresponding to the data access start position). RMW: Read-Modify-Write) processing is required.

  FIG. 6B is a 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 of FIG. This data is the same as the data shown in FIG. From this received data, the device driver selects data that requires read-modify-write (RMW) processing (M2) and records it in the RMW memory (buffer). In this RMW memory (buffer), data in units of physical sectors received from the control unit of the information recording medium (HDD) is recorded in advance, and then logical sector data corresponding to the physical sectors is (M1). The memory data selected from the first memory area is copied, and at least a part of the sector data in the physical sector unit received from the control unit of the information recording medium (HDD) is overwritten and updated. Data in units of physical sectors including the update data is output to an information recording medium (HDD).

  The device driver uses such RMW memory for [D1] shown in FIGS. 6 (1) and (2) as data subject to read-modify-write (RMW) processing. The other data, that is, the data [D2] not subject to the RMW process is output directly from the first memory area to the information recording medium (HDD) without passing through the RMW memory. .

  A processing sequence in the device driver will be described with reference to FIG. First, in step S51, the device driver determines a logical sector address (LBA) for reading in a read-modify-write (RMW) process. This LBA corresponds to LBA1 shown in (M2) RMW memory (buffer) in FIG. That is, the logical sector address (LBA) corresponding to the start position of the physical sector unit is determined. In step S52, N sectors of data are read from the recording medium from the determined LBA (LBA1). 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).

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

  Next, data recording processing including read modify write processing in the case of FIG. 4B-B will be described with reference to FIGS. FIG. 8 (1) is the same diagram as FIG. 4 (B-b), and read-modify-write (one physical sector including the logical sector number after the logical sector number corresponding to the data access end position) RMW: Read-Modify-Write) processing is required.

  FIG. 8B is a 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 of FIG. This data is the same as the data shown in FIG. From this received data, the device driver selects data that requires read-modify-write (RMW) processing (M2) and records it in the RMW memory (buffer). In this RMW memory (buffer), data in units of physical sectors received from the control unit of the information recording medium (HDD) is recorded in advance, and then logical sector data corresponding to the physical sectors is (M1). The memory data selected from the first memory area is copied, and at least a part of the sector data in the physical sector unit received from the control unit of the information recording medium (HDD) is overwritten and updated. Data in units of physical sectors including the update data is output to an information recording medium (HDD).

  The device driver uses such RMW memory for [D1] shown in FIGS. 8 (1) and (2) as data subject to read-modify-write (RMW) processing in this way. The other data, that is, the data [D2] not subject to the RMW process is output directly from the first memory area to the information recording medium (HDD) without passing through the RMW memory. .

  A processing sequence in the device driver will be described with reference to FIG. First, in step S71, the device driver records data that is not a target of read-modify-write (RMW) processing, that is, data [D2] shown in FIG. Next, in step S72, a logical sector address (LBA) for reading in a read-modify-write (RMW: Read-Modify-Write) process is determined. This LBA corresponds to LBA1 shown in (M2) RMW memory (buffer) in FIG. That is, the logical sector address (LBA) corresponding to the start position of the physical sector unit is determined. In step S73, data for N sectors is read from the recording medium from the determined LBA (LBA1). 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).

  In step S74, (M2) one physical sector data recorded in the RMW memory (buffer) is updated based on the data received from the application. This process is executed as an inter-memory copy process shown in FIG. Next, in step S54, the updated contents of the RMW buffer are recorded on the media. Data recording processing is performed by such processing.

  In the case of (C) shown in FIGS. 4 and 5, the read-modify-write (RMW) process at the data recording start position described with reference to FIGS. 6 and 7 and the data recording end position are performed. Both of the read-modify-write (RMW: Read-Modify-Write) processes are executed.

[3. Configuration example and processing example of information processing apparatus]
Next, a configuration example and a processing example of the information processing apparatus according to an embodiment of the present invention will be described. The information processing apparatus 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 shows the configuration of an information processing apparatus that accesses an information recording medium 284 such as a hard disk to execute 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 recording medium is read and used, a processing request from a user is accepted, In addition, an application program 281 exists in the uppermost layer as a window with a user for providing a user interface. Below that are 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.

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

  When a plurality of different files are applied as continuous recording files when data recording is performed, 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. The configuration shown in FIG. 11 is a 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. 2 shows a system configuration of an information processing apparatus that records data on information recording media 361 and 362 and executes processing for reading and using data recorded on a recording medium.

  Also in FIG. 11, as in FIG. 10, a file system (file management program) 310 for managing files on the information recording media 361 and 362 below the application 300 and an information recording medium based on information from the file system 310. A device driver 350 that controls 361 and 362 is shown. In the example shown in FIG. 11, two information recording media 361 and 362 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 information recording media 361 and 362 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, (M1) first memory (M2) RMW memory (buffer) described with reference to FIGS.
These memory areas are set in the memory 370.

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

  The file system 310 holds mount drive information 311, 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, 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. Access control units 353 and 354 are also provided in the device drivers 351 and 352, respectively, and the access control process with the read modify write (RMW) described above under the control of at least one of these access control units. Execute.

  In addition, inside the information recording media 361 and 362 that are recording media, media correspondence control units 363 and 364 that execute recording processing and reproducing processing of data with respect to the media are configured, and for example, the information recording media 361 configured by a hard disk. The media correspondence control unit 363 executes data access to the hard disk in units of physical sectors.

[4. Details of sequence of processing executed by information processing apparatus]
Next, various processing sequences executed in the information processing apparatus of the present invention will be described with reference to the flowchart in FIG. First, a device driver activation process sequence will be described with reference to FIG. The activation process is a process executed when the information processing apparatus is activated.

  In step S101, as initialization processing 1 at the time of activation, for example, processing such as setting of a data communication path with a loaded medium is executed. Next, in step S102, a device identification process [IDENRIFY DEVICE] is executed. In the execution of the device identification process [IDENRIFY DEVICE], a device information acquisition command is output from the access control unit of the device driver to the recording media correspondence control unit, and the recording media correspondence control unit responds to this command. As a response (return value), it is executed as a process of returning preset device information to the access control unit of the device driver.

FIG. 13 shows an example of device information returned from the recording media support control unit to the device driver access control unit as a response corresponding to device information acquisition. In the information processing apparatus of the present invention, a response (return value) having the data configuration shown in FIG. 13 is provided from the recording media control unit to the access control unit of the device driver. The difference from conventional device information is
Words 206 to 208; phase change point [X] (logical sector number (LBA))
Word 209: [N] = 1 Number of logical sectors included in one physical sector Words 210 to 213: Sector size This is a point where these pieces of information are included.

The phase change point [X] (logical sector number (LBA)) of the words 206 to 208 causes the phase change of the correspondence relationship between the logical sector and the physical sector as described above with reference to FIG. This is the logical sector number (LBA) corresponding to the phase conversion point [X] to be performed. In the example of FIG. 1, X = 61.
[N] in the word 209 is the number of logical sectors included in one physical sector. In the example of FIG. 1, N = 2.
The sector size of the words 210 to 213 is the size of the logical sector, and is, for example, 512 B (bytes).

  These pieces of information are recorded in a non-volatile memory accessible by the control unit of the recording medium. When the control unit of the recording medium receives a device information acquisition command from the device driver, the device driver Return to the access control unit.

  Returning to the flow shown in FIG. 12, the description of the device driver activation processing sequence will be continued. In step S102, a device identification process [IDENRIFY DEVICE] is executed. In step S103, it is determined whether a response is received from the recording medium correspondence control unit. If a normal response is received, that is, if the device information shown in FIG. 13 can be acquired, the process proceeds to step S104. If a normal response is not received, that is, the device information shown in FIG. 13 can be acquired. If not, the process proceeds to step S105.

If a normal response is received, the control unit of the device driver executes the following processing based on the device information acquired from the recording medium correspondence control unit in step S104.
Read words 206-208 and store in RAM as [X],
Read word 209 and store in RAM as [N],
Read words 210 to 213 and store them in RAM as [sector size] RAM as a data storage destination is a memory area accessible by the control unit of the device driver, for example, one of the memories 370 in the configuration shown in FIG. A partial memory area is used.

Specifically, for example,
In the words 206 to 208, [61] is set in the example of FIG. 1 as the phase conversion point information [X] at which the phase change of the correspondence relationship between the logical sector and the physical sector occurs.
In the example of FIG. 1, [2] is set in the word 209 as the number of logical sectors [N] included in one physical sector.
The sector size of the words 210 to 213 is set to the size of the logical sector, for example, [512B (bytes)]
The control part of the device driver
X = 61,
N = 2,
Sector size = 512B
These pieces of information are recorded in a memory area accessible by the control unit of the device driver, for example, a partial memory area in the memory 370 having the configuration shown in FIG.

On the other hand, if a normal response is not received from the recording medium correspondence control unit in step S103, that is, if the device information shown in FIG. 13 cannot be acquired, in step S105,
X = 0,
N = 0,
Sector size = 512B
These pieces of information are recorded in a memory area accessible by the control unit of the device driver, for example, a partial memory area in the memory 370 having the configuration shown in FIG.
This process is a process of recording in the memory default values preset as X, N, and sector size as provisional information when accurate information cannot be obtained.

  Thereafter, the process proceeds to step S106, and as the initialization process 2, a final process of waiting for a command input from the upper application is executed. Thereafter, a command from the application is input, and processing according to the input can be executed.

  Next, a detailed sequence such as a read-modify-write (RMW) process executed by the device driver will be described with reference to FIG.

FIG. 14 is a flowchart illustrating an overall processing sequence in data writing including execution of a read-modify-write (RMW) process executed under the control of the access control unit of the device driver, for example. The detailed sequence of each process included in FIG. 14 is shown in FIG. That is,
The write list (Write list) creation process in step S201 in FIG.
The fraction writing process A in step S205 of FIG. 14 is a flowchart of FIG.
The non-fractional writing process in step S207 of FIG. 14 is a flowchart of FIG.
The fraction writing process B in step S209 of FIG. 14 is a flowchart of FIG.
It is.

  Each processing step will be described in accordance with the flow of FIG. First, in step S201, the device driver generates a write list (Write list). The write list is an information list set corresponding to the recording data for the information recording medium, and is a list composed of information generated based on, for example, the write start LBA received from the application and the number of write sectors. As described with reference to FIGS. 6 and 8, the device driver stores the write data received from the application (M1), and can record data in units of physical sectors (M2). An RMW memory can be used.

  A detailed sequence of the write list (Write list) generation process in step S201 will be described with reference to the flowchart shown in FIG. When recording processing of recording data input from an application, the access control unit of the device driver uses a logical block address (LBA) corresponding to the recording data and a sector count that is the number of sectors of the recording data as a management information list corresponding to the recording data. Then, a write list in which offset information which is offset information of the logical sector number is recorded is generated, and a recording process referring to the write list is performed.

First, in step S251, the device driver calculates a write end LBA from the write start LBA received from the application and the number of write sectors. This calculation, as explained earlier,
Write end LBA = write start LBA + number of write sectors−1
Execute according to the above formula.

In step S252, the start sector (LBA) is compared with the phase change point (X),
Start sector (LBA) <phase change point (X)
It is determined whether or not.

Start sector (LBA) <phase change point (X)
If yes, go to step S253,
First write list (Write list 1) LBA = start sector (LBA)
First write list (Write list 1) sector count = number of received sectors First write list (Write list 1) offset = 0
And

On the other hand, if it is determined in step S252 that start sector (LBA) <phase change point (X) is not satisfied, the process proceeds to step S254.
First write list (Write list 1) LBA = start sector (LBA) -X
First write list (Write list 1) sector count = number of sectors First write list (Write list 1) offset = X
And

When the write start sector is before the phase change point [X], in step S253, the first write list is set using the write start LBA received from the application and the number of write sectors as they are. When the sector is after the phase change point [X], in step S254, the setting of the first write list is performed to adjust the write start LBA received from the application, and a value request for [X] is executed.
First write list (Write list 1) LBA = start sector (LBA) -X
First write list (Write list 1) offset = X
The process of generating the writing list by executing the adjustment is shown.

Furthermore, when the write start sector is before the phase change point [X], after the process of step S253, in step S255, it is verified whether the write end LBA is equal to or greater than the phase change point [X]. If the write end LBA is equal to or greater than the phase change point [X], update processing with the first write list and generation processing of the second write list (Write list 2) are executed in step S256.
First write list (Write list 1) sector count = X−first write list LBA
Second write list (Write list 2) LBA = 0
Second write list (Write list 2) Sector count = number of sectors−First write list (Write list 1) Sector count = number of sectors Second write list (Write list 2) Offset = X
And
In this process, when the write start sector is before the phase change point [X] and the write end sector is after the phase change point [X], the write data before the phase change point [X] For the write data after the phase change point [X], two lists are generated because the second write list is used.

  If the write end LBA is not greater than or equal to the phase change point [X] in step S255, the process of step S256 is not executed and only the first write list is generated.

For example, the received data from the application
Write start LBA = 30,
Number of write sectors = 200,
In the case where the phase change point [X] = 61 as shown in FIG. 1, two lists of the first write list and the second write list are generated. The following data is set in each list.
First write list (a) First write list LBA = 30
(B) First write list sector count = X−30
(C) First write list offset = 0
Second write list (a) Second write list LBA = 0
(B) Second write list sector count = 200− (X−30)
(C) Second write list offset = X

After the generation of the writing list (Write list), the process proceeds to step S202 of the flow shown in FIG. In step S202, (M1) initial setting is performed in which an address corresponding to the start position of the first write data of the data stored in the first memory area is set as the current buffer address. Further, in step S203,
Set the write start LBA of the write list (Write list) as the current LBA,
The number of write sectors in the write list (Write list) is set as the number of remaining transfer sectors.
If there is a second write list in addition to the first write list, processing is performed using the first write list first.

Next, in step S204, the logical sector (LBA) of the write list (Write list) is N, that is,
Number of logical sectors included in one physical sector: N,
Whether it is divisible by.
Note that [Write list LBA% N] indicates a value when the Write list LBA is divided by N. If it is divisible, the process proceeds to step S206. If not divisible, the fraction writing process A in step S205 is executed, and then the process proceeds to step S206.

  In step S204, when the logical sector (LBA) of the write list (write list) is not divisible by the number of logical sectors included in one physical sector: N, execution of the fractional write processing A in step S205 is described with reference to FIG. This is a case where the described process, that is, the start position of the write data is the target of the read modify write (RMW) process.

  The detailed sequence of the fraction writing process A in step S205 will be described with reference to the flowchart shown in FIG. The fraction write process is a write process of a logical sector part in which write data of a logical sector in physical sector units is not received from an application.

In step S301 of the flow shown in FIG. 16, the device driver calculates the number of fractional write sectors according to the following equation.
Number of fractional write sectors = N-(Write list LBA% N)
For example, the number of sectors received from the application included in the data [D1] portion shown in FIG.

Next, in step S302,
Number of remaining transfer sectors <number of fractional write sectors Verify whether the above holds. This determination process is a process for determining whether or not the remaining transfer sector number is smaller than the fractional write sector number calculated in step S301. If not, the process proceeds to step S304. If not, the process proceeds to step S303.
After setting the fraction write sector number = remaining transfer sector number, the process proceeds to step S304.

In step S304,
Fraction write LBA = write list (Write list) LBA
Fraction write offset = write list (write list) offset fraction write buffer address = buffer address These settings are executed.
The process of step S304 is a process for setting the correspondence between the data for which the fraction write process is performed and the data on the write list (Write list).
After this processing, in step S305, fractional write processing, that is, data write including read modify write (RMW) processing is executed. Note that the processing in step S305 will be described later with reference to FIG.

In step S305, after the fractional writing process, that is, the data writing including the read modify write (RMW) process is executed, in step S306, the data update, that is,
Current LBA + = Number of fractional writing sectors Number of remaining transfer sectors− = Number of fractional writing sectors Current buffer address + = Number of fractional writing sectors × 512
Information update corresponding to these write data is executed.

  That is, the current LBA is increased by the fractional writing sector number, the remaining transfer sector number is decreased by the fractional writing sector number, and the current buffer address is increased by the fractional writing sector number × 512. In this example, 1 sector (logical sector) = 512 bytes is set, and the address is set as byte data.

When the fraction writing process A is completed, the process proceeds to step S206 in FIG. 14, and the remaining transfer sector number is [N], that is,
It is determined whether or not the number of sectors (number of logical sectors) is equal to or greater than the number of logical sectors [N] included in one physical sector. If the remaining transfer sector number is less than N sectors (logical sector number), the process proceeds to step S208. If the remaining transfer sector number is N sectors (logical sector number) or more, non-fractional writing processing is performed in step S207. After execution, the process proceeds to step S208.

  The non-fractional writing process in step S207 corresponds to, for example, the writing process of the data [D2] portion illustrated in FIG. That is, it is a data recording process of a portion where write data is received from an application in units of physical sectors and data can be written.

  A detailed sequence of the non-fractional writing process in step S207 will be described with reference to the flow shown in FIG. This process is a data section in which write data in units of physical sectors is received from an application. As described above with reference to FIG. 6 and the like, as a data recording process that does not involve read-modify-write (RMW). Executed.

First, in step S351, as a command setting process applied to the data recording process,
Command issue LBA = Current LBA + Write list offset Command issue sector number = (remaining transfer sector number / N) × N
Command issue buffer address = current buffer address Make these settings. This is for setting a command issue LBA corresponding to a logical sector, a command issue sector number, and a command issue buffer address in a data section in which data can be written in units of physical sectors, and (M1) shown in FIG. Is a setting for passing data to a medium (HDD) that executes writing to the recording medium. In step S352, a write command is issued according to the information set in step S351, and data writing is executed in units of physical sectors. By this processing, writing in units of physical sectors is continuously executed according to the number of remaining transfer sectors.

After the end of the writing process, in step S353, data update, that is,
Current LBA + = Number of command issuing sectors Number of remaining transfer sectors− = Number of command issuing sectors Current buffer address + = Command issuing × 512
Information update corresponding to these write data is executed.
That is, the current LBA is increased by the number of command issuing sectors, the number of remaining transfer sectors is decreased by the number of command issuing sectors, and the current buffer address is increased by the number of command issuing sectors × 512. In this example, 1 sector (logical sector) = 512 bytes is set, and the address is set as byte data.

  When the non-fractional number writing process is completed, the process proceeds to step S208 in FIG. 14, and it is determined whether or not the remaining transfer sector number is the sector number (logical sector number) equal to or greater than zero. If the remaining transfer sector number is 0, the process proceeds to step S210. If the remaining transfer sector number is 0 sector (logical sector number) or more, the fraction write process B is executed in step S209, and then the process proceeds to step S210. move on.

  The fraction writing process B in step S209 corresponds to the writing process of the data [D1] portion shown in FIG. 8, for example. At the data recording end position, write data is not received from the application in units of physical sectors, and is executed as a data recording process involving read modify write (RMW).

  The detailed sequence of the fraction writing process B in step S209 will be described with reference to the flow shown in FIG. This process is a data section in which write data in units of physical sectors is not received from the application, and is executed as a data recording process with read-modify-write (RMW) as described above with reference to FIG. The

First, in step S401,
Fractions written LBA = current LBA
Fraction write offset = write list (write list) offset fraction write sector number = remaining transfer sector number fraction write buffer address = buffer address These settings are executed.
The process of step S401 is a process for setting the correspondence between the data for which the fractional writing process is executed and the data on the writing list (Write list).
After this processing, in step S402, fractional write processing, that is, data write including read modify write (RMW) processing is executed. Note that the processing in step S402 will be described later with reference to FIG.

In step S402, after data writing including fractional write processing, that is, read modify write (RMW) processing, is performed, in step S403, data update,
Current LBA + = Number of fractional writing sectors Number of remaining transfer sectors− = Number of fractional writing sectors Current buffer address + = Number of fractional writing sectors × 512
Information update corresponding to these write data is executed.

  That is, the current LBA is increased by the fractional writing sector number, the remaining transfer sector number is decreased by the fractional writing sector number, and the current buffer address is increased by the fractional writing sector number × 512. In this example, 1 sector (logical sector) = 512 bytes is set, and the address is set as byte data.

  When this fractional writing process B is completed, the process proceeds to step S210 in FIG. 14 to determine whether or not there is a second write list (Write list 2). If there is, the process returns to step S203, and the second write list (Write) For list 2), the processing from step S203 is executed.

  In this way, when there is fraction data at the start position of the record data and when there is fraction data at the end position of the record data, read modify write (RMW) is performed in the fraction write process A and the fraction write process B, respectively. The accompanying data recording process is executed.

  A detailed sequence of the fraction writing process in step S305 in the flow of FIG. 16 and step S402 in the flow of FIG. 18 will be described with reference to the flowchart shown in FIG.

First, in the first step S451 of the fraction writing process, the fraction writing start LBA is set according to the following calculation formula.
Fractional write start LBA = fractional write LBA + fractional write offset Further, the LBA immediately before the phase change is calculated according to the following equation.
LBA immediately before phase change = (X ÷ N) × N
Note that (X ÷ N) means an integer part when the phase change point [X] is divided by the number of logical sectors [N] included in one physical sector. For example, in the example described with reference to FIG.
N = 2,
X = 61,
(X ÷ N) = 30
LBA immediately before phase change = (X ÷ N) × N
= 30 × 2 = 60
LBA = 60 immediately before the phase change is calculated.

Next, in step S452, [LBA immediately before phase change] calculated in step S451, [fraction writing start LBA], and phase conversion point [X] are compared.
LBA immediately before phase change ≦ start of fraction writing LBA <X
If the above comparison expression holds, the process proceeds to step S455. If the comparison expression is not satisfied, the process proceeds to step S453.

When the above comparison formula is satisfied, this is a special example that occurs when the fractional write start LBA is not less than the LBA immediately before the phase change and not more than X. Except for this special example, the process proceeds to step S453. In step S453, setting of a command for fraction writing processing and the like is executed. In particular,
Command issue LBA = (fraction write LBA ÷ N) × N + fraction write offset Command issue buffer address = RMW buffer address Command issue sector number = N
Modify buffer address A = RMW buffer address + (fractional write LBA% N) × 512
Modify buffer address B = fraction write buffer address Modify size = fraction write sector x 512
Perform these settings.

Note that (fractional write LBA ÷ N) is an integer value when the fractional write LBA is divided by N.
The command issue LBA is set as (fractional write LBA ÷ N) × N + fractional write offset, and the command issue buffer address is set as the RMW buffer address. The RMW buffer corresponds to, for example, the (M2) RMW memory area shown in FIG. 6B or FIG.

Further, the number of command issuing sectors is N, which is the number of logical sectors corresponding to one physical sector. This means that writing is performed in units of physical sectors. further,
Modify buffer address A = RMW buffer address + (fractional write LBA% N) × 512
Modify buffer address B = fractional write buffer address.
The modification buffer address A is, for example, the address A of the (M2) RMW memory area shown in FIGS. 6 (2) and 8 (2), and the modification buffer address B is, for example, FIG. 6 (2), FIG. (M1) shown in (2) is the address B of the first memory area. Further, modify size = fractional writing sector × 512. In this example, the logical sector is assumed to be 512 bytes.

  Next, in step S454, read modify write processing is executed. A processing sequence of this read-modify-write process will be described with reference to a flowchart shown in FIG. This process is the process described above with reference to FIGS. 6 and 8. The data read from the recording medium in units of physical sectors is held in the (M2) RMW memory area, and (M1) In this process, data in one memory area is copied to the (M2) RMW memory area, the data is updated, and is recorded on a recording medium in units of physical sectors.

  In step S501, the physical sector including the logical sector that is the target of the read-modify-write process is read and held in the (M2) RMW memory area shown in FIGS. 6 and 8, and in step S502, the modify buffer address Copy processing from B to the modification buffer address A for the modification size, issue a write command in step S503, and (M2) record the data updated in the RMW memory area in units of physical sectors. To record. By this process, the process of step S454 shown in FIG. 19 is executed.

In the determination of step S452 in the flow of FIG.
LBA immediately before phase change ≦ start of fraction writing LBA <X
If it is determined that the comparison formula is satisfied, the process proceeds to step S455. When the above comparison formula is satisfied, this is a special example that occurs when the fractional write start LBA is not less than the LBA immediately before the phase change and not more than X. For this special case,
In step S455,
It is determined whether or not the LBA immediately before the X-phase change == the fractional write sector number.
For example, in the case of X = 61 shown in FIG. 1, it is determined whether LBA immediately before phase change = 60, and whether fractional write sector number = 61−60 = 1 is satisfied.

X—LBA immediately before phase change == number of fractional writing sectors If the above equation is satisfied, setting of commands for fractional writing processing is executed in step S456. If the above equation is not satisfied, a fractional number is calculated in step S458. Executes command setting for write processing. That is, the setting command is changed depending on whether or not the number of fractional writing sectors exists until just before the phase change point.

If the above equation holds, that is, if the fractional write sector number exists just before the phase change point, the setting of the fractional write processing command and the like is executed as follows in step S456. That is,
Command issue LBA = (fraction write LBA ÷ N) × N + fraction write offset Command issue buffer address = RMW buffer address Command issue sector number = fraction write sector number These commands are set words, and a write command is executed in step S457. In such a case, only the fraction data is written without executing the read-modify-write process.

On the other hand, if the above equation does not hold, that is, if the number of fractional write sectors does not exist until just before the phase change point, the setting of the fractional write processing command and the like is executed as follows in step S458. That is,
Command issue LBA = (fraction write LBA ÷ N) × N + fraction write offset Command issue buffer address = RMW buffer address Command issue sector number = N
Modify buffer address A = RMW buffer address + (fractional write LBA% N) × 512
Modify buffer address B = fraction write buffer address Modify size = fraction write sector x 512
Perform these settings.

  After these processes, the process of step S454, that is, the read modify write process described with reference to FIG. 20 is executed.

  In this manner, the information processing apparatus of the present invention verifies the recording data passed from the application to the device driver, and if there are fractional logical sectors in the recording start sector or recording end sector, that is, in units of physical sectors. The read-modify-write is executed except for a special case, that is, when the determination in step S435 shown in FIG. 19 is Yes. That is, the device driver acquires data in units of physical sectors from the recording medium, holds the acquired data in the RMW memory area, copies the updated logical sector data received from the application, and then stores the data in units of physical sectors Data is output to a recording medium (such as an HDD).

  That is, the access control unit of the device driver of the information processing apparatus according to the present invention executes a process of outputting recording data for a recording medium input from an application that generates recording data in units of logical sectors to the media correspondence control unit. The corresponding control unit inputs the recording data from the access control unit, and executes data recording processing on the recording medium in units of physical sectors different from the logical sectors. In this data recording process, the access control unit outputs a device information acquisition request to the media correspondence control unit, that is, an IDENTIFY Device command, and returns from the media correspondence control unit to one physical sector as a return value corresponding to the command. The number of logical sectors included [N] is acquired, and the acquired information [N] is applied, and the recording start position or recording end position of the recording data input from the application in units of logical sectors is managed by the media correspondence control unit. Verify whether it is different from the physical sector division position that is the access unit for the media to be recorded, and if it is different, obtain the recording data of physical sector unit via the media correspondence control unit, store it in the memory, and store the stored physical A sector in which part of the sector data is input from the application. Update the record data of the unit, the physical sector data after update processing to execute the read-modify-write (RMW) process for outputting the media corresponding control unit.

  Note that the access control unit, as a response corresponding to the device information acquisition request from the media correspondence control unit, phase conversion point [X] information where the phase change of the correspondence relationship between the logical sector and the physical sector occurs, sector size information And applying these pieces of information, the recording start position or recording end position of the recording data input from the application in logical sector units is the physical sector segment position that is an access unit to the medium managed by the media control unit. There is a case where a process of verifying whether or not they are different is executed.

  In the device driver access control unit, as described with reference to FIGS. 6 and 8, when executing the read-modify-write (RMW) process, the first memory area for storing recording data input in units of logical sectors from the application From the read modification write (RMW) memory area, the logical sector data to be read modified write (RMW) is copied.

  Further, the access control unit, when recording the recording data input from the application, as a management information list corresponding to the recording data, a logical block address (LBA) corresponding to the recording data, a sector count that is the number of sectors of the recording data, A write list in which offset information which is offset information of the logical sector number is recorded is generated, and a recording process with reference to the write list is performed. Further, when the list is generated, there is a phase conversion point [X] where the phase change of the correspondence relationship between the logical sector and the physical sector occurs, and the recording data input in units of logical sectors from the application is the phase conversion point [X]. In the case of data extending back and forth, a first writing list for recording data before the phase conversion point [X] and a second writing list for recording data after the phase conversion point [X] are generated.

[5. Hardware configuration example of information processing apparatus]
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 data 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 an image. It is provided with a VTR mode in which data supplied through the input / output unit 414, the audio input / output unit 416 or the communication unit 431 is recorded on a recording medium, and data recorded on the recording medium is reproduced. .

  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. 21, a 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 signal 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 the information recording medium, and power for each component A power supply 441 for supplying power 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 401 includes a mode switching key for switching operation modes such as a moving image shooting mode, a still image shooting mode, 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.

  The control unit (CPU) 401 reads out and executes a program for performing a target process from the ROM 419 in accordance with 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 kinds of information on these information recording media via a drive 432. Also, the information recorded on these information recording media is reproduced. The hard disk as the magnetic disk is set as 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. A CPU (Central Processing Unit) 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.

  A ROM (Read Only Memory) 502 stores programs used by the CPU 501, calculation parameters, and the like. A RAM (Random Access Memory) 503 is a program used in the execution of the CPU 501, parameters that change as appropriate during the execution, (M 1) the first memory described with reference to FIGS. 6 and 8, (M 2) RMW Memory etc. are set. 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 to an external bus 506 such as a PCI (Peripheral Component Interconnect / Interface) bus via a bridge 505.

  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.

  An HDD (Hard Disk Drive) 511 has a built-in hard disk and drives the hard disk. The hard disk has, for example, the settings described above with reference to FIG. The hard disk is used as an image data file storage area and stores various computer programs such as a data processing program.

  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.

  The configuration example of the information processing apparatus illustrated in FIGS. 21 and 22 is an example of the apparatus, and the information processing apparatus is not limited to the configuration illustrated in FIGS. 21 and 22, and executes the processing described in the above-described embodiments. Any configuration is possible.

The present invention is not limited to the HDD (hard disk drive), but the number of logical sectors included in one physical sector described above: N,
Phase conversion point: X,
The present invention can be applied to all randomly accessible media having properties corresponding to these. 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 present invention has been described in detail above with reference to specific embodiments. However, it is obvious that those skilled in the art can make modifications and substitutions of the embodiments without departing from the gist of the present invention. In other words, the present invention has been disclosed in the form of exemplification, and should not be interpreted in a limited manner. In order to determine the gist of the present invention, the claims should be taken into consideration.

  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 can be installed on a recording medium such as a built-in hard disk.

  Note that the various processes described in the specification are not only executed in time series according to the description, but may be executed in parallel or individually according to the processing capability of the apparatus that executes the processes or as necessary. Further, in this specification, the system is a logical set configuration of a plurality of devices, and the devices of each configuration are not limited to being in the same casing.

  As described above, according to the configuration of one embodiment of the present invention, in the access control unit of the information processing apparatus that performs the data recording process on the recording medium (information recording medium), the media correspondence control that executes the data recording on the medium. IDENTIFY Device command as a device information acquisition request is output to the device, and device information such as the number of logical sectors [N] and phase change point [X] included in one physical sector is received. Based on the received information If the recording start position or recording end position of the recording data input from the application in units of logical sectors is different from the physical sector division position that is the unit of access to the media managed by the media correspondence control unit. In addition, the recording data for each physical sector is acquired via the media compatible control unit. Read-modify-write that stores in the memory, updates some logical sector data of the stored physical sector data with recording data in units of sectors input from the application, and outputs the updated physical sector data to the media corresponding control unit ( Since the RMW) process is executed, data input / output in units of physical sectors is realized between the device driver and the media compatible control unit, and the device driver side confirms logical sector data without data update. This makes it possible for the upper layer to grasp the occurrence of unforeseen circumstances such as data loss.

It is a figure 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 an access unit of a medium, ie, HDD. It is a figure explaining the problem in the access process when 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 a figure explaining the problem in the access process when 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 a figure explaining a read modify write (RMW: Read-Modify-Write) process and its necessity. It is a figure explaining the necessity determination process of a read modify write (RMW: Read-Modify-Write) process. It is a figure explaining the specific example of a read modify write (RMW: Read-Modify-Write) process. It is a figure which shows the flowchart explaining the sequence of a read modify write (RMW: Read-Modify-Write) process. It is a figure explaining the specific example of a read modify write (RMW: Read-Modify-Write) process. It is a figure which shows the flowchart explaining the sequence of a read modify write (RMW: Read-Modify-Write) process. It is a figure explaining the system configuration | structure of the information processing apparatus which concerns on one Example of this invention. It is a figure explaining the system configuration | structure of the information processing apparatus which concerns on one Example of this invention. It is a figure which shows the flowchart explaining the device driver starting process in the information processing apparatus which concerns on one Example of this invention. It is a figure explaining the data structural example of the device information which a device driver acquires in a device driver starting process. It is a figure which shows the flowchart explaining the sequence of the data recording process containing the read modify write in the information processing apparatus which concerns on one Example of this invention. FIG. 15 is a diagram illustrating a flowchart for describing a sequence of a write list (Write list) creation process in Step S201 of FIG. It is a figure which shows the flowchart explaining the sequence of the fraction write-in process A of step S205 of FIG. It is a figure which shows the flowchart explaining the sequence of the non-fractional writing process of step S207 of FIG. It is a figure which shows the flowchart explaining the sequence of the fraction write-in process B of step S209 of FIG. It is a figure which shows the flowchart explaining the sequence of the execution process of a fraction writing process. It is a figure which shows the flowchart explaining the sequence of the execution process of a read modify write (RMW) process. It is a figure explaining the structural example of the digital video camera as one Example of the information processing apparatus of this invention. It is a figure explaining the structural example of PC as one 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 354, 355 Access control unit 361, 362 Information recording medium 363, 364 Media correspondence 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 (Central Processing Unit)
502 ROM (Read-Only-Memory)
503 RAM (Random Access Memory)
504 Host bus 505 Bridge 506 External bus 507 Interface 508 Keyboard 509 Pointing device 510 Display 511 HDD (Hard Disk Drive)
512 drive 514 connection port 515 communication unit 521 removable recording medium 522 external connection device

Claims (15)

An information processing apparatus that executes data recording processing on a recording medium,
An access control unit that outputs recording data for a recording medium input from an application that generates recording data in units of logical sectors to the media correspondence control unit;
A media correspondence control unit that inputs the recording data from the access control unit and executes a data recording process on a recording medium in a physical sector unit different from the logical sector;
The access control unit
Output a device information acquisition request to the media correspondence control unit, and acquire the number of logical sectors [N] included in one physical sector as a response corresponding to the device information acquisition request from the media correspondence control unit,
Physical sector classification in which the recording start position or recording end position of recording data input in logical sector units from the application by applying the acquisition information [N] is an access unit for media managed by the media correspondence control unit It is verified whether or not it is different from the position, and if it is different, the recording data for each physical sector is obtained via the media correspondence control unit and stored in the memory, and a part of the stored physical sector data is stored in the logical sector data. An information processing apparatus that is configured to execute read-modify-write (RMW) processing in which update is performed by recording data in units of sectors input from an application, and physical sector data after update processing is output to the media correspondence control unit. . The access control unit
An IDENTIFY Device command is output as a device information acquisition request to the media correspondence control unit, and the logical sector number [N] information included in one physical sector is obtained from the media correspondence control unit as a return value corresponding to the command. The information processing apparatus according to claim 1, wherein the information processing apparatus is configured to perform the processing. The access control unit
Further, as a response corresponding to the device information acquisition request from the media correspondence control unit, the phase conversion point [X] information at which the phase change of the correspondence relationship between the logical sector and the physical sector occurs is acquired, and the acquired phase conversion point [ X] Whether the recording start position or recording end position of the recording data input from the application in logical sector units by applying the information is different from the physical sector division position that is an access unit to the media managed by the media control unit The information processing apparatus according to claim 1, wherein the information processing apparatus is configured to execute a process of verifying whether or not. The access control unit
Further, as a response corresponding to the device information acquisition request from the media correspondence control unit, the sector size information of the logical sector is acquired, the acquired sector size information is applied, and the recording data input from the application in units of logical sectors 2. The configuration for executing a process for verifying whether a recording start position or a recording end position is different from a physical sector division position which is a unit of access to a medium managed by the media control unit. The information processing apparatus described in 1. The access control unit
In executing the read modify write (RMW) process,
Copy processing of logical sector data to be read-modify-write (RMW) processing target from a first memory area that stores recording data input in units of logical sectors from the application to a read-modify-write (RMW) memory area The information processing apparatus according to claim 1, wherein the information processing apparatus is configured to execute The access control unit
When recording the recording data input from the application, a management information list corresponding to the recording data includes a logical block address (LBA) corresponding to the recording data, a sector count that is the number of sectors of the recording data, and offset information of the logical sector number. The information processing apparatus according to claim 1, wherein a writing list in which certain offset information is recorded is generated and a recording process is performed with reference to the writing list. The access control unit further includes:
There is a phase conversion point [X] where the phase change of the correspondence relationship between the logical sector and the physical sector occurs, and the recording data input in units of the logical sector from the application is data extending before and after the phase conversion point [X]. The first writing list for the recording data before the phase conversion point [X] and the second writing list for the recording data after the phase conversion point [X] are executed. The information processing apparatus according to claim 6. An information processing method for performing a data recording process on a recording medium in an information processing device,
An access control step in which an access control unit outputs recording data for a recording medium input from an application that generates recording data in units of logical sectors to the media correspondence control unit;
A media correspondence control unit having the media correspondence control step of inputting the recording data from the access control unit and executing a data recording process on the recording medium in a physical sector unit different from the logical sector;
The access control step includes
Device information acquisition that outputs a device information acquisition request to the media correspondence control unit and acquires the number of logical sectors [N] contained in one physical sector as a response to the device information acquisition request from the media correspondence control unit Steps,
Physical sector classification in which the recording start position or recording end position of recording data input in logical sector units from the application by applying the acquisition information [N] is an access unit for media managed by the media correspondence control unit A verification step for verifying whether it is different from the position;
In the verification step, if a verification result that is different is obtained, recording data in units of physical sectors is obtained via the media correspondence control unit, stored in the memory, and some logical sectors of the stored physical sector data A read-modify-write (RMW) processing step for executing a read-modify-write (RMW) process in which data is updated with recording data in units of sectors input from an application, and the physical sector data after the update process is output to the media correspondence control unit; ,
An information processing method characterized by being a step of executing. The device information acquisition step includes:
An IDENTIFY Device command is output as a device information acquisition request to the media correspondence control unit, and the logical sector number [N] information included in one physical sector is obtained from the media correspondence control unit as a return value corresponding to the command. The information processing method according to claim 8, wherein the information processing method comprises: The device information acquisition step further includes:
As a response corresponding to the device information acquisition request from the media correspondence control unit, it is a step of obtaining phase conversion point [X] information where the phase change of the correspondence relationship between the logical sector and the physical sector occurs,
The verification step includes
A physical sector in which the recording start position or the recording end position of recording data input in units of logical sectors from the application by applying the acquired phase conversion point [X] information is an access unit to the medium managed by the media control unit The information processing method according to claim 8, wherein the information processing method is a step of executing a process of verifying whether or not the position is different from each other. The device information acquisition step further includes:
In response to the device information acquisition request from the media correspondence control unit, it is a step of acquiring the sector size information of the logical sector,
The verification step includes
Applying the acquired sector size information, the recording start position or recording end position of the recording data input in logical sector units from the application is a physical sector segment position that is an access unit for the medium managed by the media control unit. The information processing method according to claim 8, wherein the information processing method is a step of executing processing for verifying whether or not they are different. The access control step includes
In executing the read modify write (RMW) process,
Copy processing of logical sector data to be read-modify-write (RMW) processing target from a first memory area that stores recording data input in units of logical sectors from the application to a read-modify-write (RMW) memory area The information processing method according to claim 8, wherein: The access control step includes
When recording the recording data input from the application, a management information list corresponding to the recording data includes a logical block address (LBA) corresponding to the recording data, a sector count that is the number of sectors of the recording data, and offset information of the logical sector number. 9. The information processing method according to claim 8, wherein a writing list in which certain offset information is recorded is generated, and a recording process is performed with reference to the writing list. The access control step further includes:
There is a phase conversion point [X] where the phase change of the correspondence relationship between the logical sector and the physical sector occurs, and the recording data input in units of the logical sector from the application is data extending before and after the phase conversion point [X]. In the case, the first writing list for the recording data before the phase conversion point [X] and the second writing list for the recording data after the phase conversion point [X] are executed. 14. The information processing method according to 13. In the information processing apparatus, a computer program for executing a data recording process on a recording medium,
An access control step for causing the access control unit to output recording data for a recording medium input from an application that generates recording data in units of logical sectors, to the media correspondence control unit;
A media correspondence control step of inputting the recording data from the access control unit to the media correspondence control unit, and executing a data recording process on the recording medium in a physical sector unit different from the logical sector;
The access control step includes
A device information acquisition request for outputting a device information acquisition request to the media correspondence control unit and acquiring the number of logical sectors [N] contained in one physical sector as a response corresponding to the device information acquisition request from the media correspondence control unit Steps,
Physical sector classification in which the recording start position or recording end position of recording data input in logical sector units from the application by applying the acquisition information [N] is an access unit for media managed by the media correspondence control unit A verification step for verifying whether it is different from the position;
In the verification step, if a verification result that is different is obtained, recording data in units of physical sectors is obtained via the media correspondence control unit, stored in the memory, and some logical sectors of the stored physical sector data A read-modify-write (RMW) processing step for executing a read-modify-write (RMW) process for updating data with recording data in units of sectors input from an application and outputting the updated physical sector data to the media correspondence control unit; ,
The computer program characterized by being a step which performs.

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