CN103985393B - A kind of multiple optical disk data parallel management method and device - Google Patents
A kind of multiple optical disk data parallel management method and device Download PDFInfo
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Abstract
The present invention is applied to technical field of data storage, a kind of multiple optical disk data parallel management method and device are provided, described device includes controller, described multiple CD drives are connected with by memory interface, described controller is connected with front end main frame by HPI, described controller is connected with storage buffer by data memory channels, described storage buffer is built-in with data distribution list, also include CD burning relief area and read buffer device, methods described at least includes method for reading data, method for writing data, one of data-updating method, above-mentioned three kinds of method executed in parallel.In the present invention each CD drive can independent operating, by concurrent management data, realize the concurrent reading and writing of a large amount of CD drives, improve the overall performance of whole optical disc storage system, increased reading and writing data speed, it is to avoid waste bandwidth.
Description
Technical field
The invention belongs to data storage technical field, more particularly, to a kind of multiple optical disk data parallel management method and device.
Background technology
During big data, codes or data growth rate is not read to be lifted, and then produces immense pressure for memory capacity and performance.Its
In more and more significant datas need long-term preservation.Wherein optical disc storage is a kind of long-term preserving type of cheap data.
The CD being mostly used in filing belongs to write once CD, that is, can only write once, but can read infinitely
Secondary.And erasable optical disk both can be read to write, although writing number of times to be more than one, number of times is still had to limit it is however generally that can
The readwrite performance of rewritable disk is below a writing optical disk.For write once CD, the full whole Zhang Guangpan of best write once.Its
Reason is repeatedly to add writes the metadata needing each adding modification data Lead-In Area, if data Lead-In Area does not have remaining sky
Between, then it is unable to supplemental data；And write operation needs positioning to start writing position, on the one hand causes hydraulic performance decline, the opposing party's face
Being also easy to produce mistake causes whole Zhang Guangpan to cancel.
Host computer system accesses storage system by standard access interface.These access interfaces are broadly divided into file interface, block
Interface and Object Access interface.And optical disc storage system requires to provide corresponding interface to facilitate main frame to deposit for internal data
Take.
Conventionally used CD drive accesses data of optical disk, and access procedure can be divided into data carving to CD, or
Two read-write processes of data are read from CD.The CD drive that data of optical disk can only be read is referred to as CD-ROM driver,
The CD drive that can read and can write is referred to as CD burning driver.The access speed one side of CD depends on CD light
Drive the read or write speed of device, on the other hand depend on the characteristic of CD media.But single CD drive writable disc speed at present
Degree is less than 50MB/s, well below the readwrite bandwidth of the MB/s up to a hundred required by high-performance data storage system.
Single CD drive is only a main frame and provides data access service at present；Same main frame cannot be realized many
Read and write while individual CD；Multiple main frames cannot access optical disc storage system simultaneously, also cannot imprinting writable disc data parallel.
Multiple main frames or multiple for CD read and write request can only adopt serial mode.This makes optical disc storage system be difficult to apply to
Among mass data storage system.
Content of the invention
In view of the above problems, it is an object of the invention to provide a kind of multiple optical disk data parallel management method and device, purport
Solve existing a large amount of CDs cannot concurrent reading and concurrent writing technical problem.
On the one hand, described multiple optical disk data parallel management method is applied to multiple optical disk data parallel managing device, described dress
Put including controller, described controller is connected with multiple CD drives by memory interface, described controller is connect by main frame
Mouth is connected with front end main frame, and described controller is connected with storage buffer by data memory channels, in described storage buffer
It is equipped with data distribution list, also includes CD burning relief area and read buffer device, methods described at least includes method for reading data, number
According to one of wiring method, data-updating method, in described controller, be provided with data access task queue, can accept, process and
Follow the tracks of multiple main frames or the concurrent data access task of server so that above-mentioned three kinds of method executed in parallel, wherein,
Described method for reading data includes：Data institute save location is determined according to read data request searching data allocation table,
And correspond to taking-up corresponding data from CD, CD burning relief area or read buffer device；
Described method for writing data includes：Determined according to allocation strategy and write the CD that data is deposited, and write number by described
According to being stored in corresponding CD burning relief area, in data distribution list, position in CD burning relief area for the data write in record,
By the data carving in CD burning relief area to CD, record CD labelling and its internal physical in data distribution list simultaneously
Position.
Described data-updating method includes：Request searching data allocation table is updated according to data and determines preservation position described in data
Put, and correspondence updates the data in CD burning relief area or writes number according to described method for writing data in corresponding CD
According to.
On the other hand, a kind of multiple optical disk data parallel storage device, including controller, storage buffer, some storages connect
Mouthful, some HPI data allocation tables, multiple CD drives are connected with by memory interface, described controller passes through master
Machine interface is connected with front end main frame, and described controller connects storage buffer, described storage buffer by storage inside passage
Built-in CD burning relief area and read buffer device, wherein,
Described front end main frame is used for sending read data request, write data requests, data renewal request, and in reading
According to when receive controller return data；
Described controller is used for determining data institute save location according to read data request searching data allocation table, and corresponding from
Corresponding data is taken out in CD, CD burning relief area or read buffer device；And after being used for receiving write data requests, according to
Allocation strategy determines writes the CD that data is deposited, and write data is stored in corresponding CD burning relief area, in data
In allocation table, record writes position in CD burning relief area for the data, by the data carving in CD burning relief area to light
Disk, record CD labelling and its internal physical position in data distribution list simultaneously；It is additionally operable to update request lookup according to data
Data distribution list determines save location described in data, and correspondence updates the data or in corresponding CD in CD burning relief area
Write data according to described method for writing data.
The physical address that described data distribution list is preserved for record data, described physical address include CD labelling and
Its internal physical address, and the physical address within storage buffer；
Described CD burning relief area is used for depositing data to be written, when meeting imprinting condition, CD burning is buffered
The data Write once optical disc in area；
Described read buffer device is used for storing the data of frequent reading.
The invention has the beneficial effects as follows：The invention provides a kind of multiple optical disk data parallel management technique scheme, wherein many
Include multiple CD drives in data of optical disk parallel memory device, each CD drive can independent operating, by parallel
Management data, realizes the concurrent reading and writing of a large amount of CD drives, improves the overall performance of whole optical disc storage system, increased number
According to read or write speed, it is to avoid waste bandwidth.
Brief description
Fig. 1 is the method for reading data flow chart that first embodiment of the invention provides；
Fig. 2 is the method for writing data flow chart that first embodiment of the invention provides；
Fig. 3 is the data-updating method flow chart that first embodiment of the invention provides；
Fig. 4 is a kind of structure chart of multiple optical disk data parallel storage device that second embodiment of the invention provides；
Fig. 5 is storage buffer structure chart；
Fig. 6 is controller concurrent reading and concurrent writing schematic diagram.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, below in conjunction with drawings and Examples, right
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only in order to explain the present invention, and
It is not used in the restriction present invention.
In order to technical solutions according to the invention are described, to illustrate below by specific embodiment.
Embodiment one：
Multiple optical disk data parallel management method provided in an embodiment of the present invention is applied to multiple optical disk data parallel storage device,
Described device includes controller, and described controller is connected with multiple CD drives by memory interface, and described controller passes through
HPI is connected with front end main frame, and described controller is connected with storage buffer by data memory channels, and described storage is delayed
Rush device and be built-in with data distribution list, also include CD burning relief area and read buffer device.The present embodiment method at least includes data
One of read method, method for writing data, data-updating method, above-mentioned three kinds of method executed in parallel, such as can simultaneously drive
Multiple CD drives carry out CD write it is also possible to carry out CD write and reading etc. simultaneously, and each CD drive is only
Vertical operation, is written and read operating.
In the present embodiment, as shown in fig. 6, having data access task queue in controller, can accept, process and following the tracks of
The concurrent data access task of multiple main frames or server.By multitask is asynchronous and Parallel Scheduling, maximally utilize multiple
CD drive and the band width in physical of storage buffer.Overcome the problem of conventional optical disc system single task serial execution, and profit
With storage buffer, the indivisible operation once imprinted CDs, become multiple child-operations, can be parallel and different between child-operation
Step execution, thus improving the efficiency of optical disc storage system, reduces the task waiting time of front-end server.
For example, server A sends data to controller, and controller is just saved in data buffer zone relevant position this data
Can complete, need not necessarily wait data carving to CD.In the process, controller still can with response server A its
His read-write requests, and controller can also respond the service request of other servers, thus realizing multiple read-write tasks in parallel
Execution.
If the data of associated optical disc imprinting relief area meets CD burning condition, controller is CD burning relief area
Data set is burnt on CD, without server intervention.
In the present embodiment, described method for reading data includes：Data is determined according to read data request searching data allocation table
Institute's save location, and corresponding taking-up corresponding data from CD, CD burning relief area or read buffer device.Described data write
Method includes：Determined according to allocation strategy and write the CD that data is deposited, and write data are stored in corresponding CD burning
Relief area, in data distribution list, record writes position in CD burning relief area for the data, by CD burning relief area
Data carving is to CD, record CD labelling and its internal physical position in data distribution list simultaneously.Described data renewal side
Method includes：Request searching data allocation table is updated according to data and determines save location described in data, and corresponding slow in CD burning
Rush area to update the data or write data according to described method for writing data in corresponding CD.
Specifically, with reference to shown in Fig. 1, described method for reading data specifically includes：
The read data request that step S101, receiving front-end main frame send.
Described front end main frame is the main body sending request instruction, including in described read data request continues patrolling of fetching data
Collect address, in front end main frame side, the physical address of data need not be concerned about, the logical address of data is saved in data distribution list
In.
Step S102, according to described read data request searching data allocation table, determine the physical address that data is located.
Preserve in data distribution list is logical address and the corresponding physical address of data, when controller receives reading
After request, therefrom obtain logical address, then look up described data distribution list, find corresponding physical address.
If the described data of step S103 is on CD, an idle CD drive is selected to read described physics on CD
The corresponding data in address.
When described physical address corresponds to CD, that is, the data continuing is located on CD, selects an idle CD to drive
Dynamic device reads the corresponding data of described physical address on CD.When CD drive all operationally then waits.
If the described data of step S104 is in CD burning relief area, described in reading from CD burning relief area physically
The corresponding data in location；
If the described data of step S105 is in read buffer device, read the corresponding number of described physical address from read buffer device
According to.
If described physical address corresponds to CD burning relief area or read buffer device, directly from described CD burning
The corresponding data of described physical address is read in relief area or read buffer device.
After step S106, reading data finish, data is back to front end main frame.
Finally, digital independent finishes, and data is back to front end main frame by controller.
With reference to shown in Fig. 2, described method for writing data specifically includes：
The write data requests that step S201, receiving front-end main frame send；
Step S202, according to allocation strategy determine write the CD position that data is deposited；
Step S203, write data are write corresponding CD burning relief area；
Step S204, record in data distribution list and currently write data in described CD burning relief area physically
Location；
Step S205, when meeting imprinting condition, the data in described CD burning relief area is written to corresponding CD；
Step S206, record in data distribution list the CD labelling currently writing data place CD and its internal physical ground
Location.
It is necessary first to the CD burning relief area of the data corresponding CD of write will be write before write data, then CD is delayed
The data deposited in area is written in CD, delays simultaneously need to recording in data distribution list and currently writing data in described CD burning
Rush the physical address in area, and currently write CD labelling and its internal physical address of data place CD, such as specifically
Which CD, and data physical address in an optical disc.
With reference to Fig. 3, described data-updating method specifically includes：
The data that step S301, receiving front-end main frame send updates request；
Step S302, according to described data update request searching data allocation table, determine data be located physical address；
If the described data of step S303 is in CD burning relief area, physical address described in CD burning relief area
Correspondence position updates the data；
If the described data of step S304, on CD, writes data into CD according to described method for writing data, and labelling
The physical address that data is located in former CD cancels.
When needing to update the data, parsing updates request instruction and obtains logical address, then looks up data distribution list, finds
Corresponding physical address, this physical address is the physical address of data to be updated, if described physical address corresponds to CD burning
Relief area, that is, described data in CD burning relief area, then physical address correspondence position described in CD burning relief area
Update the data；If described physical address correspond to CD, that is, data to be updated on CD, according to described method for writing data
Write data into CD, and the physical address that flag data is located in former CD cancels.
Preferably, described data-updating method also includes:
Described data whether is preserved in step S305, inspection read buffer.If existing, corresponding positions in read buffer device
Put and update the data.
Present embodiments provide a kind of multiple optical disk data parallel storage method, managed by data parallel, improve data
Reading speed, it is to avoid bandwidth waste.
Embodiment two：
Fig. 4 shows a kind of structure of multiple optical disk data parallel storage device provided in an embodiment of the present invention, for the ease of
Illustrate to illustrate only the part related to the embodiment of the present invention.
A kind of multiple optical disk data parallel storage device that the present embodiment provides includes controller 1, and described controller passes through to deposit
Storage interface is connected with multiple CD drives 2, and described controller is connected with front end main frame 3, described controller by HPI
It is connected with storage buffer 4 by data memory channels, as shown in figure 5, described storage buffer is built-in with data distribution list 41,
Also include CD burning relief area 42 and read buffer device 43.Described memory interface is typically the high speed modular such as SATA, SAS or USB
Memory interface, described HPI includes logic interfacing and physical interface, and physical interface is physical connection mode, typically ether
Net, CD-ROM drive passage, the high speed physical network such as Infiniband；Logic interfacing is Data Transport Protocol, typically file interface, block
Interface and object interface.Described storage buffer is one or one group of solid-state disk or hard disk, and its combinations thereof.This reality
Apply in example, in described controller, be provided with data access task queue, can accept, process and follow the tracks of multiple main frames or server
Concurrent data access task, the plurality of CD drive mutually can not interfered with independent operating, all can carry out independence
Data read-write operation, to realize concurrent management control.
Wherein,
Described front end main frame 3 is used for sending read data request, write data requests, data renewal request, and for reading
The data that controller returns is received during data；
Described controller 1 is used for determining data institute save location according to read data request searching data allocation table, and corresponding
Corresponding data is taken out from CD, CD burning relief area or read buffer device；And after being used for receiving write data requests, root
Determine according to allocation strategy and write the CD that data is deposited, and write data are stored in corresponding CD burning relief area, counting
Write position in CD burning relief area for the data according to record in allocation table, by the data carving in CD burning relief area to light
Disk, record CD labelling and its internal physical position in data distribution list simultaneously；It is additionally operable to update request lookup according to data
Data distribution list determines save location described in data, and correspondence updates the data or in corresponding CD in CD burning relief area
Write data according to described method for writing data.
The physical address that described data distribution list 41 is preserved for record data, described physical address includes CD labelling
And its internal physical address, and the physical address within storage buffer；
Described CD burning relief area 42 is used for depositing data to be written, when meeting imprinting condition, CD burning is delayed
Rush the data Write once optical disc in area；
Described read buffer device 43 is used for storing the data of frequent reading.
In the present embodiment, described controller is used for realizing data parallel management, includes reading data, writes data and data more
Newly.When implementing, described controller includes：
Request receiving module, the read data request sending for receiving front-end main frame；
Address search module, for according to described read data request searching data allocation table, determining the physics that data is located
Address；
Data read module, if for described data in CD, selects an idle CD drive to read on CD
The corresponding data of described physical address；If for described data in CD burning relief area, read from CD burning relief area
The corresponding data of described physical address；And if for described data in read buffer device, reading described thing from read buffer device
The corresponding data in reason address；
Data returns module, for reading after data finishes, data is back to front end main frame.
Preferably, described request receiving module is additionally operable to the write data requests that receiving front-end main frame sends；Described address is looked into
Module is looked for be additionally operable to write, according to allocation strategy determination, the CD position that data is deposited；Described controller also includes：
Data write. module, for writing corresponding CD burning relief area by write data；
Address logging modle, currently writes data in described CD burning relief area for recording in data distribution list
Physical address；And for recording the CD labelling currently writing data place CD and its internal physical ground in data distribution list
Location；
CD burning module, for when meeting imprinting condition, the data in described CD burning relief area being written to
Corresponding CD.
Preferably, described request receiving module is additionally operable to the data renewal request of receiving front-end main frame transmission；Described address
Searching modul is additionally operable to update request searching data allocation table according to described data, determines the physical address that data is located；Described
Controller also includes：
Data update module, if for described data in CD burning relief area, described in CD burning relief area
Physical address correspondence position updates the data；And if for described data in CD, according to described method for writing data by number
According to write CD, and the physical address that flag data is located in former CD cancels.
It is further preferred that described data update module is additionally operable to check in read buffer whether preserve described data.
If existing, in read buffer device, relevant position updates the data.
By above-mentioned, the invention provides a kind of multiple optical disk data parallel management technique, wherein multiple optical disk data parallel is deposited
Include multiple CD drives in storage device, each CD drive can independent operating, by concurrent management data, realize big
The concurrent reading and writing of amount CD drive, improves the overall performance of whole optical disc storage system, increased reading and writing data speed, it is to avoid
Waste bandwidth.
Originally the foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all the present invention's
Any modification, equivalent and improvement made within spirit and principle etc., should be included within the scope of the present invention.
Claims (9)
1. a kind of multiple optical disk data parallel management method is it is characterised in that methods described is applied to the management of multiple optical disk data parallel
Device, described device includes controller, and described controller is connected with multiple CD drives, described controller by memory interface
Front end main frame is connected with by HPI, described controller is connected with storage buffer by data memory channels, described deposits
Storage buffer is built-in with data distribution list, also includes CD burning relief area and read buffer device, methods described at least includes data
One of read method, method for writing data, data-updating method, are provided with data access task queue in described controller, can
Accept, process and follow the tracks of multiple main frames or the concurrent data access task of server so that above-mentioned three kinds of method executed in parallel,
Wherein,
Described method for reading data includes：Data institute save location is determined according to read data request searching data allocation table, and right
Corresponding data should be taken out from CD, CD burning relief area or read buffer device；
Described method for writing data includes：Determined according to allocation strategy and write the CD that data is deposited, and write data are deposited
Enter corresponding CD burning relief area, record writes position in CD burning relief area for the data, by light in data distribution list
Data carving in disk imprinting relief area is to CD, record CD labelling and its internal physical position in data distribution list simultaneously
Put；
Described data-updating method includes：Request searching data allocation table is updated according to data and determines save location described in data,
And correspondence updates the data in CD burning relief area or writes data according to described method for writing data in corresponding CD；
Wherein, described method for reading data specifically includes：
The read data request that receiving front-end main frame sends；
According to described read data request searching data allocation table, determine the physical address that data is located；
If described data is on CD, an idle CD drive is selected to read the corresponding number of described physical address on CD
According to；
If described data is in CD burning relief area, read the corresponding data of described physical address from CD burning relief area；
If described data is in read buffer device, read the corresponding data of described physical address from read buffer device；
After reading data finishes, data is back to front end main frame.
2. multiple optical disk data parallel management method as claimed in claim 1 is it is characterised in that described method for writing data specifically wraps
Include：
The write data requests that receiving front-end main frame sends；
Determined according to allocation strategy and write the CD position that data is deposited；
Write data are write corresponding CD burning relief area；
The physical address currently writing data in described CD burning relief area is recorded in data distribution list；
When meeting imprinting condition, the data in described CD burning relief area is written to corresponding CD；
The CD labelling currently writing data place CD and its internal physical address is recorded in data distribution list.
3. multiple optical disk data parallel management method as claimed in claim 1 is it is characterised in that described data-updating method specifically wraps
Include：
The data that receiving front-end main frame sends updates request；
Request searching data allocation table is updated according to described data, determines the physical address that data is located；
If described data is in CD burning relief area, physical address correspondence position described in CD burning relief area updates number
According to；
If described data is on CD, write data into CD according to described method for writing data, and former light that flag data is located
Physical address in disk cancels.
4. multiple optical disk data parallel management method as claimed in claim 3 is it is characterised in that described data-updating method also wraps
Include：
Check in read buffer and whether preserve described data；If existing, in read buffer device, relevant position updates the data.
5. it is characterised in that described device includes controller, described controller passes through a kind of multiple optical disk data parallel storage device
Memory interface is connected with multiple CD drives, and described controller is connected with front end main frame, described controller by HPI
It is connected with storage buffer by data memory channels, described storage buffer is built-in with data distribution list, also include CD and carve
Record relief area and read buffer device, are provided with data access task queue, can accept, process and follow the tracks of multiple masters in described controller
The concurrent data access task of machine or server, wherein,
Described front end main frame is used for sending read data request, write data requests, data renewal request, and for when reading data
Receive the data that controller returns；
Described controller is used for accordingly described front end main frame sends parallel read data request, write data requests, data renewal asks
Ask, specifically for data institute save location is determined according to read data request searching data allocation table, and correspond to from CD, CD quarter
Corresponding data is taken out in record relief area or read buffer device；And after being used for receiving write data requests, true according to allocation strategy
Surely write the CD that data is deposited, and write data are stored in corresponding CD burning relief area, remember in data distribution list
Position in CD burning relief area for the data is write in record, and the data carving in CD burning relief area to CD is counting simultaneously
According to record CD labelling and its internal physical position in allocation table；Being additionally operable to be updated according to data asks searching data allocation table true
Fixed number is according to described save location, and correspondence updates the data or according to described data in corresponding CD in CD burning relief area
Wiring method writes data；
The physical address that described data distribution list is preserved for record data, described physical address includes CD labelling and its interior
Portion's physical address, and the physical address within storage buffer；
Described CD burning relief area is used for depositing data to be written, when meeting imprinting condition, CD burning relief area
Data Write once optical disc；
Described read buffer device is used for storing the data of frequent reading.
6. multiple optical disk data parallel storage device as claimed in claim 5 is it is characterised in that described controller includes：
Request receiving module, the read data request sending for receiving front-end main frame；
Address search module, for according to described read data request searching data allocation table, determining the physical address that data is located；
Data read module, if for described data in CD, selects an idle CD drive to read described on CD
The corresponding data of physical address；If for described data in CD burning relief area, read described from CD burning relief area
The corresponding data of physical address；And if being used for described data in read buffer device, described in reading from read buffer device physically
The corresponding data in location；
Data returns module, for reading after data finishes, data is back to front end main frame.
7. multiple optical disk data parallel storage device as claimed in claim 5 is it is characterised in that described controller includes：
Request receiving module, the write data requests sending for receiving front-end main frame；
Address search module, writes, for determining according to allocation strategy, the CD position that data is deposited；
Data write. module, for writing corresponding CD burning relief area by write data；
Address logging modle, for recording the physics currently writing data in described CD burning relief area in data distribution list
Address；And for recording the CD labelling currently writing data place CD and its internal physical address in data distribution list；
CD burning module, for when meeting imprinting condition, the data in described CD burning relief area being written to correspondence
CD.
8. multiple optical disk data parallel storage device as claimed in claim 5 is it is characterised in that described controller includes：
Request receiving module, updates request for the data that receiving front-end main frame sends；
Address search module, updates request searching data allocation table according to described data, determines the physical address that data is located；
Data update module, if for described data in CD burning relief area, physics described in CD burning relief area
Address correspondence position updates the data；And if for described data in CD, data is write according to described method for writing data
Enter CD, and the physical address that flag data is located in former CD cancels.
9. multiple optical disk data parallel storage device as claimed in claim 8 is it is characterised in that described data update module is additionally operable to
Check in read buffer and whether preserve described data；If existing, in read buffer device, relevant position updates the data.
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| US9336818B1 (en) * | 2015-02-04 | 2016-05-10 | HGST Netherlands B.V. | Method for reducing adjacent track interference effects in a data storage system |
| KR102531741B1 (en) * | 2016-01-12 | 2023-05-11 | 삼성전자 주식회사 | Memory apparatus having multiple buffer and Method for driving memory having multiple buffer |
| CN106202414B (en) * | 2016-07-12 | 2019-11-22 | 武汉光忆科技有限公司 | A kind of file system and file memory method and system based on huge capacity compact discs library |
| CN107728943B (en) * | 2017-10-09 | 2020-09-18 | 华中科技大学 | Method for delaying generation of check optical disc and corresponding data recovery method |
| CN108491166B (en) * | 2018-03-27 | 2021-05-07 | 江苏菲利斯通信息科技有限公司 | Read data cache management method for optical disk library |
| CN108920093B (en) * | 2018-05-30 | 2022-02-18 | 北京三快在线科技有限公司 | Data reading and writing method and device, electronic equipment and readable storage medium |
| CN112530469A (en) * | 2019-10-08 | 2021-03-19 | 北京中科开迪软件有限公司 | Optical disk parallel processing method and system |
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| CN1383142A (en) * | 2001-04-23 | 2002-12-04 | 于君 | Data storage device using rotating disk as data carrier |
| CN1742253A (en) * | 2003-03-10 | 2006-03-01 | 松下电器产业株式会社 | Data transmission control method |
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