WO2005109169A1 - データアクセス方法、およびその方法が実施される装置と記録媒体 - Google Patents
データアクセス方法、およびその方法が実施される装置と記録媒体 Download PDFInfo
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- WO2005109169A1 WO2005109169A1 PCT/JP2005/007996 JP2005007996W WO2005109169A1 WO 2005109169 A1 WO2005109169 A1 WO 2005109169A1 JP 2005007996 W JP2005007996 W JP 2005007996W WO 2005109169 A1 WO2005109169 A1 WO 2005109169A1
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- Prior art keywords
- data
- recording medium
- access device
- size
- parameter
- Prior art date
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- 238000000034 method Methods 0.000 title claims description 23
- 230000003247 decreasing effect Effects 0.000 claims abstract description 8
- 239000004065 semiconductor Substances 0.000 claims description 10
- 238000010586 diagram Methods 0.000 description 6
- 239000012634 fragment Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 238000007781 pre-processing Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
- G06F3/0655—Vertical data movement, i.e. input-output transfer; data movement between one or more hosts and one or more storage devices
- G06F3/0661—Format or protocol conversion arrangements
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0602—Interfaces specially adapted for storage systems specifically adapted to achieve a particular effect
- G06F3/0604—Improving or facilitating administration, e.g. storage management
- G06F3/0607—Improving or facilitating administration, e.g. storage management by facilitating the process of upgrading existing storage systems, e.g. for improving compatibility between host and storage device
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0602—Interfaces specially adapted for storage systems specifically adapted to achieve a particular effect
- G06F3/061—Improving I/O performance
- G06F3/0613—Improving I/O performance in relation to throughput
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0668—Interfaces specially adapted for storage systems adopting a particular infrastructure
- G06F3/0671—In-line storage system
- G06F3/0673—Single storage device
- G06F3/0679—Non-volatile semiconductor memory device, e.g. flash memory, one time programmable memory [OTP]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S707/00—Data processing: database and file management or data structures
- Y10S707/99931—Database or file accessing
- Y10S707/99932—Access augmentation or optimizing
Definitions
- the present invention relates to a data access method and an apparatus and a recording medium on which the method is implemented.
- the present invention relates to a technology for guaranteeing access performance to a memory card type recording medium.
- a memory card type recording medium using a nonvolatile memory is a physical card such as an SD card (registered trademark), a compact flash (registered trademark), and a memory stick (registered trademark). Shapes and interfaces are standardized, and are widely used in many devices, including digital camera recording media.
- Non-volatile memory has several operating principles. This section describes the recording / reproducing technology for memory cards, taking the current mainstream semiconductor flash memory as an example.
- a write access unlike a magnetic recording medium such as a hard disk, a semiconductor flash memory cannot overwrite an already written address while erasing data. In order to realize the apparent overwriting, it is necessary to erase the already written data and then write the data again. However, it is inefficient to erase the entire storage area every time a part of the recorded data is rewritten at random and rewrite the data in the entire area again. For this reason, a memory card having a structure in which a storage area of a memory card is divided into a plurality of erase blocks and erasing and writing can be performed in erase block units has been commercialized. In this memory card, it is possible to divide write data of an arbitrary size into the size of an erasure block and fragment it, and to record fragment data for each erasure block.
- the write delay time indicates the time required from when a write Z read processing command is generated and the processing is completed.
- FIG. 7A schematically shows the relationship between the write data size for a memory card and the time required for writing (write delay time).
- the horizontal axis represents the write data size
- E represents the erase block size.
- the vertical axis indicates the write delay time.
- FIG. 7B schematically shows the relationship between the read data size for the memory card and the time required for reading (read delay time).
- the horizontal axis and vertical axis in FIG. 7B are the same as those in FIG. 7A.
- FIG. 8 schematically shows a relationship between command processing overhead and write or read access data size.
- the command processing overhead does not depend on the access data size and requires almost constant processing time. Therefore, the command processing overhead becomes relatively large as the access data size power S is small.
- a memory card having such recording / Z-reproduction characteristics is designed to write or read data at a data rate that allows for a sufficient margin to satisfy the required access performance. Therefore, with the current memory card read / write Z writing mechanism, the performance of the memory card cannot be used to its fullest extent!
- Patent Document 1 Japanese Patent Application Laid-Open No. 2003-32629
- the external specification of the memory card is SD card (trademark), CompactFlash (trademark), and memory stick (trademark), and detailed specifications of the physical shape and interface are standardized and commonly used by the equipment of each company. You can do it.
- the internal specification of the memory card does not specify the erase block size. Therefore, what kind of internal operation data is recorded on the memory card for an arbitrary write data size varies depending on the memory card, and it can be seen from the data access device side. Absent.
- Digital still cameras require high-speed recording in order to improve high-speed continuous shooting performance.
- a temporary buffer memory capable of high-speed processing and having a memory capacity corresponding to the maximum number of continuous shots is provided in the camera.
- high-speed continuous shooting performance is guaranteed by storing data in a temporary buffer and then copying the data to a memory card.
- data is copied to the memory card after the shooting operation is completed, so that the memory card cannot be removed for a certain period of time after the shooting operation is completed. If the memory card is removed from the digital still camera after a certain period of time after the shooting operation is completed, the data being transferred (copied) will be damaged.
- a recording medium in which data is written in data size units that can be increased or decreased stepwise and data transfer efficiency when data is written varies according to the data size
- the data access device and method for reading and writing data by the data access device will be configured as follows.
- a parameter indicating data transfer efficiency when data is written to the recording medium in each of the data sizes is recorded on the recording medium in advance. Then, when reading and writing data, the data access device first transmits a parameter acquisition command to the recording medium. Next, the recording medium receiving the parameter acquisition command transmits the parameter to the data access device. Further, the data access device receiving the parameter compares the parameter with the data transfer efficiency required for the data to be read / written by the data access device, so that the optimum data size at the time of data writing is obtained. Set. Then, the data access device reads and writes data from and to the recording medium at the set optimal data size.
- the present invention it is possible to realize optimum recording / reproducing access performance according to the characteristics of each recording medium. Furthermore, it is possible to guarantee the recording / reproducing access performance to future recording media without the need to upgrade the software on the device side.
- FIG. 1 is a configuration diagram of a memory card and a data access device according to a first embodiment.
- FIG. 2 is a diagram of a user area and a system area in a memory card.
- FIG. 3 is a correspondence table of a write data size to be recorded in a system area and a delay time.
- FIG. 4 is a processing flow of the memory card and the data access device according to the first embodiment.
- FIG. 5 is a configuration diagram of a memory card and a data access device according to a second embodiment.
- FIG. 6 is a processing flow of the memory card and the data access device according to the second embodiment.
- FIG. 7A is a schematic diagram illustrating a relationship between a write data size and a write delay time.
- FIG. 7B is a schematic diagram showing a relationship between a write data size and a write delay time.
- FIG. 8 is a relationship diagram between command processing overhead and access data size. Explanation of symbols
- FIG. 1 shows the relationship between a memory card-type recording medium (hereinafter referred to as a memory card) and a data access device.
- the memory card 101 as a recording medium is a small force that can be detachably mounted on the data access device 105.
- This is a disk-type recording medium, and has a command analysis unit 102, a delay parameter 103, and a delay nomometer reading unit 104.
- Each means 102, 103, 104 is composed of a software card installed in the memory card 101 in advance.
- means for reading parameters from the delay parameter reading means 104 and transmitting the parameters to the data access device 105 is configured.
- the data access device 105 includes a delay parameter read command issuing unit 106, a data reproducing unit 107 based on a designated data size, a data recording unit 108 based on a designated data size, and an optimum data size selecting unit 109.
- the delay parameter read command issuing means 106 constitutes "means for issuing a parameter acquisition command”
- the optimum data size selecting means 109 constitutes "means for selecting a data size at the time of data writing”
- the data reproducing means constitutes "means for reading and writing data”.
- These units include, for example, a software unit which is also installed in advance in the data access device 105 and at least a part of the data reproducing unit 107 and the data recording unit 108 are constituted by hardware units.
- the storage area 202 of the memory card 101 has a user area 203 and a system area 204 as shown in FIG.
- the system area 204 is an area where initial data is recorded when the memory card 201 is manufactured, and is an area where the user cannot rewrite data.
- the delay parameter 103 is stored in the system area 204 in advance.
- the system area 204 constitutes a parameter storage unit.
- FIG. 3 is an example of a table (correspondence table) showing a relationship between a write data size and a write delay time for a memory card (specifically, a semiconductor flash memory mounted therein).
- a parameter S (referred to as delay parameter 103 in the present embodiment) indicating the data transfer efficiency when data is written in each data size is configured.
- the average data rate is shown. Tarates are not included in the table.
- Figure 3 shows that this parameter uniquely determines the average data rate.
- the average data rate is information indicating how much data can be transferred every second (M Byte / sec), and is an example of information indicating data transfer efficiency.
- the write delay time indicates the time required to generate a write Z read processing command and complete the processing. As shown in Fig. 3, the write delay time varies according to the data size. As the data size increases, the delay time increases. The information on the time required to read and write data is configured from the write delay time.
- the write data size recorded as the delay parameter 103 is an integer multiple of the erase block size (E) of the memory card 101 (semiconductor flash memory). It is sized.
- the memory card 101 has a delay parameter read command for reading the delay parameter 103.
- the delay parameter 103 is stored in the memory card 101 in advance. After performing the above preprocessing, the memory card 101 is loaded into the data access device 105.
- the data access device 105 that records digital video data of the DV format in real time issues a delay parameter read command to the memory card 101 before the point in time when real time data recording is required (S401). .
- the command analysis means 102 extracts the delay parameter read command, reads the delay parameter 103 from the system area 204 according to the extracted command, and sends it to the data access device 105 (S402).
- the optimum data size selection means 109 uses a write data server capable of achieving 3.125 MByteZ seconds from the received delay parameter 103. Is selected. For example, assuming that the value of the delay parameter 103 is as shown in FIG. 3, the data access device 105 needs to write data with a data size (block) of 128 KB to guarantee the recording data rate of the DV system. After judging that it is good, the data size is selected as the optimum data size (S403).
- the data access device 105 (specifically, the optimum data size selection means 109) issues a write command so that the data recording means 108 is accessed at 128 KB. (S404).
- the data recording unit 108 executes a data write process with a write data size of 128 KB on the memory card 101 (S405).
- the digital video data of the DV system is always recorded on the memory card 101 with a write data size of 128 KB.
- the memory card 101 has different internal detailed specifications, it is possible to optimally select a write data size that satisfies the required performance, and guarantee the recording access performance. can do.
- the present invention is not limited to the recording of digital video data in the DV format.
- the reading is exactly the same up to the selection of the optimum data size, and only the portion for setting the optimum data size selected in the data reproducing means 107 and performing reproduction access is different.
- FIG. 5 shows the relationship between the memory card and the data access device.
- the memory card 601 includes a command analyzing unit 602, a delay parameter 603, a delay parameter reading unit 604, and an optimum data size selecting unit 605.
- Each means 602, 604, 605 is constituted by software installed in the memory card 600 in advance.
- the data access device 606 has an optimum data size read command issuing unit 607, a data reproducing unit 608 according to a specified data size, and a data recording unit 609 according to a specified data size.
- These means 606 to 609 also comprise, for example, software to be installed in the data access device 606 in advance. At least a part of the data reproducing unit 608 and the data recording unit 609 is constituted by hardware.
- the optimum data size read command issuing means 607 constitutes "means for transmitting information indicating a required data transfer efficiency required for data to be read / written by the data access device to a recording medium". Further, the data reproducing means 608 and the data recording means 609 are configured to set the data size at the time of data writing based on the information indicating the optimum data size transmitted by the recording medium that has received the information indicating the required data transfer efficiency. Means for reading and writing data from and to the recording medium in a data size. " The optimum data size read command constitutes "information indicating the required data transfer efficiency".
- the delay parameter reading means 104 selects "the optimum data size at the time of data writing by receiving information indicating the required data transfer efficiency transmitted by the data access device and collating it with the parameters stored in the storage unit.
- Means "and” means for transmitting information indicating the selected optimum data size to the data access device ".
- an optimum data size read command having a desired delay time as an argument is created and stored in the memory card 601 in advance.
- the memory card 601 is provided with an optimum data size selecting means 605 which is a means for selecting the optimum data, which is different from the first embodiment in these points.
- the delay parameter 103 is stored in the memory card 601 in advance. After performing the above preprocessing, the memory card 601 is loaded into the data access device 606.
- the data access device 606 that records digital video data of the DV system in real time issues an optimum data size read command using the desired average data rate as an argument to the memory card 601 (S 601). .
- the optimum data size read command constitutes information indicating the required data transfer efficiency as described above. This command specifically indicates the data transfer efficiency required for the method of data transferred to and from the memory card 601.
- the optimum data size read command issuing means 607 generates and issues an optimum data size read command indicating the data size that is optimal for the data transfer, such as the information method of the data transferred to and from the memory card 601.
- the memory card 601 reads the optimum data size read command based on the command analysis of the command analysis means 602.
- the delay parameter reading means 604 reads the delay parameter 603 recorded in the system area 204 according to the read command thus read (S602).
- the optimum data size selection means 605 calculates an average data rate value based on the read delay parameter 603.
- the delay parameter 603 includes, for example, a table (target table) indicating a relationship between a settable write data size and a delay time in each of the write data sizes, as in the first embodiment.
- the optimum data size selecting means 605 transmits information indicating the selected optimum data size to the data access device 606.
- the data access device 606 includes, as a return value of the optimum data size read command issued by the optimum data size read command issuing unit 607, a write data size (128 KB in the above example) that guarantees writing at a desired data rate. ) Is received from the memory card 601 and acquired.
- the data access device 606 generates a write command for accessing the data recording means 609 and the data reproducing means 608 at 128 KB (S604), and the data recording means 609 receiving the write command always writes the 128 KB.
- the digital video data of the DV format in the data size is recorded and accessed in the memory card 601 (S605).
- an example of recording DV digital video data is taken as an example.
- the present invention is not limited to the recording of DV digital video data.
- the reading is exactly the same up to the point of selecting the optimum data size, and only the portion for setting the optimum data size selected in the data reproducing means 608 according to the specified data size and performing the reproduction access is different.
- the present invention can be used in an application that needs to guarantee the access performance of recording and reproduction by using a memory card in which a non-volatile memory is mounted as a recording medium.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05736645.2A EP1746491B1 (en) | 2004-05-07 | 2005-04-27 | Method for accessing data, apparatus and recording medium for performing that method |
US10/587,239 US7631140B2 (en) | 2004-05-07 | 2005-04-27 | Data accessing method, device in which the data accessing method is executed and recording medium |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2004138614A JP4392601B2 (ja) | 2004-05-07 | 2004-05-07 | データアクセス装置および記録媒体 |
JP2004-138614 | 2004-05-07 |
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WO2005109169A1 true WO2005109169A1 (ja) | 2005-11-17 |
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Family Applications (1)
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PCT/JP2005/007996 WO2005109169A1 (ja) | 2004-05-07 | 2005-04-27 | データアクセス方法、およびその方法が実施される装置と記録媒体 |
Country Status (5)
Country | Link |
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US (1) | US7631140B2 (ja) |
EP (1) | EP1746491B1 (ja) |
JP (1) | JP4392601B2 (ja) |
CN (1) | CN100468308C (ja) |
WO (1) | WO2005109169A1 (ja) |
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CN1950793A (zh) | 2007-04-18 |
JP2005321952A (ja) | 2005-11-17 |
JP4392601B2 (ja) | 2010-01-06 |
US7631140B2 (en) | 2009-12-08 |
EP1746491A4 (en) | 2009-05-06 |
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